Спутник ФКИ. THEMIS-C (ARTEMIS-P2). [Редактировать]

Научный малый космический аппарат несущий на своем борту комплект научной аппаратуры для изучения электрического и магнитного полей, а также потоков частиц.
На аппарате установлены:

  • измеритель электрического поля EFI;
  • феррозондовый магнитометр FGM;
  • индукционный магнитомер SCM;
  • электростатический анализатор ESA;
  • твердотельный телескоп SST.

Дополнительные наименования

#НаименованияПоиск в новостяхПоиск в документах
1MIDEX/THEMISНайтиНайти
2THEMIS-P2НайтиНайти
3Explorer 87НайтиНайти
4ARTEMIS-P2НайтиНайти
530582НайтиНайти

Дополнительная классификация

#Наименования
1Страна производитель - США
2Тип орбиты - Элиптическая
3Тип оператора(владельца) - государственный
4Страна оператор(владелец) - Международные

Технические характеристики

#ХарактеристикаЗначение
1Масса, кг77
2Мощность, Вт37

Пусковые характеристики

#ХарактеристикаЗначение
1Код NSSDC2007-004C

Экономические характеристики

#ХарактеристикаДата измеренияЗначение
1Стоимость (аппарат), млн. долл.20

Информация об удачном запуске

#ХарактеристикаЗначение
1Дата пуска2007-02-17 at 23:01:00 UTC
2Полезная нагрузка 1xTHEMIS-A
3Полезная нагрузка 1xTHEMIS-B (ARTEMIS-P1)
4Полезная нагрузка 1xTHEMIS-C (ARTEMIS-P2)
5Полезная нагрузка 1xTHEMIS-D
6Полезная нагрузка 1xTHEMIS-E
7Ракета-носитель 1xДельта 2 7925

Найдено 65 документов по запросу «THEMIS-C (ARTEMIS-P2)». [Перейти к поиску]


Дата загрузки: 2017-12-10
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0.63/5
AAS 12-182 OPTIMIZING ARTEMIS LIBRATION POINT ORBIT STATIONKEEPING COSTS ... Earth-Moon libration points—ARTEMIS P1 and P2—performed a combined total of.... It expands on previously reported THEMIS/ARTEMIS maneuver calibration techniques and results....2 days. INTRODUCTION The P1 and P2 spacecraft of the Acceleration, Reconnection... Moon’s Interation with the Sun (ARTEMIS) mission—the first two spacecraft... and Macroscale Interactions during Substorms (THEMIS) mission—that had relatively coarse... trajectory2 to get the two ARTEMIS spacecraft to Lissajous orbit and... of the other THEMIS spacecraft in Earth orbit (i.e., THEMIS-Low). However, special... ARTEMIS mission. The end result was a calibration process that helped the ARTEMIS... prior studies.3 BACKGROUND The two ARTEMIS spacecraft are spin-stabilized and... of the calibration efforts. Figure 1. THEMIS/ARTEMIS spacecraft thrust pulse dynamics.1 This... to both plan and reconstruct THEMIS side-thrust maneuvers. GMAN takes... for maneuvers conducted during the THEMIS primary mission and the orbit... metric (i.e., ∆V Targeting) to the entire THEMIS/ARTEMIS side-thruster calibration data set... SMA Targeting calibration data for THEMIS B (ARTEMIS P1). 5 Thruster Scale Factor 0.95... ∆V and SMA Targeting data for THEMIS C (ARTEMIS P2). As shown in Figure 2 and... Targeting Throughout the THEMIS primary mission and ARTEMIS low-energy transfer to... for P1 and SKM 4 for P2. A total of 4 maneuvers were executed... Statistics for Several Subsets of ARTEMIS Lissajous Stationkeeping Maneuvers. (Year/DOY... 1.00E-05 P1 8.00E-06 P2 6.00E-06 4.00E-06 2.00E... of the ∆V magnitude error during ARTEMIS Lissajous orbit operations with a line... time between stationkeeping maneuvers. Throughout ARTEMIS Lissajous orbit operations, the calibration... orbit insertions for P1 8 and P2. Moreover, almost all maneuvers prior... P1 and SKM 12 for P2. 3 Single Pulse Outliers 2 CENDIS (deg... Calibration -5 Pulse Width (deg) Figure 5. ARTEMIS P1 CENDIS for maneuvers between... Calibration -9 Pulse Width (deg) Figure 6. ARTEMIS P2 CENDIS for maneuvers between initial...° and 0.78° for P1 and P2, respectively, for multi-pulse maneuvers... maneuvers that small in magnitude. ARTEMIS P1 instrument sphere loss anomaly... instrument sphere unexpectedly detached from ARTEMIS P1 and imparted a 5.67 cm... insertion. FUTURE WORK Now that ARTEMIS Lissajous orbit operations have ceased... to anomalies encountered by the ARTEMIS and THEMIS-Low spacecraft. For example..., as demonstrated during the THEMIS and ARTEMIS missions, careful attention to maneuver... stationkeeping maneuver designs for ARTEMIS P1 and P2. Thanks are also extended... work during the ARTEMIS Lissajous orbit operations. The THEMIS and ARTEMIS missions are... ARTEMIS stationkeeping maneuvers. 11 Table 2. Maneuver size and error statistics for ARTEMIS... size and error statistics for ARTEMIS P2’s Lissajous stationkeeping maneuvers. Maneuver ID...-flight Maneuver Performance for the THEMIS and ARTEMIS Mission Spacecraft,” Proceedings of..., B. D., Gandhi, S., and Bester, M., “Navigating THEMIS to the ARTEMIS Low-Energy Lunar Transfer... Earth-Moon Libration Orbiters: The ARTEMIS Mission,” Proceedings of the 2011...: Response and Impliciations for the ARTEMIS Mission,” Proceedings of the 22nd...



Дата загрузки: 2016-12-29
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0.18/5
ARTEMIS Operations from Earth-Moon Libration ..., 94720 ARTEMIS – an extension of the NASA Medium Explorer mission THEMIS – is... rate. This paper addresses the ARTEMIS mission’s operational challenges and lessons... Moon’s Interaction with the Sun (ARTEMIS), an ambitious mission extension of... and Macroscale Interactions during Substorms1 (THEMIS), a NASA constellation of five spin... their final THEMIS mission orbits to stable lunar orbits. The ARTEMIS baseline... of both spacecraft from the THEMIS end-of-mission orbit to... lunar orbits. In total, the ARTEMIS mission operations team executed 170... ARTEMIS mission is utilizing these instruments to measure the Figure 1. THEMIS spacecraft... continued measurements of the remaining THEMIS spacecraft. In lunar orbit, it... and P2 or THEMIS B and THEMIS C, respectively—are spin stabilized and started the ARTEMIS....810 kg for P2. By the completion of the ARTEMIS lunar insertion... during the THEMIS mission. B. Ground Systems Overview During the ARTEMIS mission the... systems already successfully utilized for THEMIS.7-10 A short 3. RCS system and... During all phases of the ARTEMIS mission, orbit determination (OD) was... maximum likelihood algorithm developed for ARTEMIS operations by J. Hashmall et al.... In lunar orbit operations, the ARTEMIS mission has begun to use... would have been a benefit to ARTEMIS’s data return capability to have... SKM1 labeled. a) P1 b) P2 A. Summary The nominal ARTEMIS libration orbit phase was... scheduling strategy worked well for ARTEMIS operations it did, in theory... were selected for use during THEMIS to balance the relationship between... problem was previously encountered by ARTEMIS while targeting the lunar gravity... expenditures taking P1 and P2 from their THEMIS orbits to libration insertion... pulsed mode. 6 4. Attitude Determination Frequency THEMIS performed attitude determination using data...’s FGM and SSA sensors. When ARTEMIS was envisioned, the FGM’s usefulness... utilizes SSA sensor data. The ARTEMIS SSA sensor measures the sun... the tracking sites used for ARTEMIS. V. Lunar Orbit Phase A. Summary On... from departing its THEMIS orbit to reach this state. 7 P2 followed a similar... 1. Mitigating Lunar Orbit Insertion Risk ARTEMIS’s lunar orbit insertion24 (LOI) maneuver... across all 5 of the original THEMIS spacecraft. ARTEMIS P2 has experienced 2 of these... methods used successfully during the THEMIS prime mission.25 For the.... Furthermore, FlatSat, the THEMIS spacecraft simulator used by ARTEMIS to verify all... these were significant challenges the ARTEMIS team had to overcome to... process which is integral to ARTEMIS/THEMIS post-maneuver recovery operations. While... in a significant precession. During the THEMIS mission, these attitude changes were... attitude precession maneuvers. However, for ARTEMIS these attitude precession events would.... At the start of the ARTEMIS mission, P2’s attitude was orientated 7.8 degrees... stationkeeping. VII. Current Mission Status ARTEMIS is continuing to collect solar... at least one of the ARTEMIS spacecraft into the nearterminator exospheric... events and several unexpected occurrences ARTEMIS is safely in lunar orbit... the challenges encountered by the ARTEMIS mission were a result of taking... that the experiences of the ARTEMIS team will help further the... space. 11 Appendix A Acronym List ARTEMIS ATS BGS DSM DSN EFI... ORM P1 P2 PRM RCS SCM SKM SSA SSL TCM THEMIS USN... Maneuver ARTEMIS Probe 1 (Also known as THEMIS B) ARTEMIS Probe 2 (Also known as THEMIS C) Period... and support of the ARTEMIS trajectory. The THEMIS and ARTEMIS missions are operated... NAS5-02099. References 1 Angelopoulos, V., “The THEMIS Mission,” Space Science Reviews, Vol..., “Preliminary Trajectory Design for the ARTEMIS Lunar Mission,” Proceedings of the..., B. D., Gandhi, S., and Bester, M., “Navigating THEMIS to the ARTEMIS Low-Energy Lunar Transfer... Earth-Moon Libration Orbiters: The ARTEMIS Mission,” Proceedings of the AIAA...-515. 5 Sholl, M., Leeds, M., and Holbrook, J., “THEMIS Reaction Control System—From I&T through..., Management, and Conditioning for the THEMIS Spacecraft Constellation,” Proceedings of the..., D., Thorsness, J., Frey, S., Cosgrove, D., and Rummel, D., “THEMIS Operations,” Space Science Reviews, Vol... and Flight Operations of the THEMIS Constellation Mission,” Proceedings of the..., 2010. 10 Frey, S., Angelopoulos, V., Bester, M., THEMIS: Implementation of a Challenging Mission Design... for Sun-only Attitude Determination: THEMIS Becomes ARTEMIS,” Proceedings of the 21st...-flight Maneuver Performance for the THEMIS and ARTEMIS Mission Spacecraft,” Proceedings of...; D. P. Cosgrove; S. Frey; and M. G. Bester, "Optimizing ARTEMIS Libration Point Orbit Stationkeeping Costs...: Response and Implications for the ARTEMIS Mission,” Proceedings of the 22nd...-Point Orbit Phase of the ARTEMIS Mission,” Proceedings of the 22nd..., S. B., Sweetser, T. H., Angelopoulos, V., Folta, D., and Woodard, M., “ARTEMIS Lunar Orbit Insertion and Science... Rummel, D., “Orbit Design for the THEMIS Mission,” Space Science Reviews, Vol...



Дата загрузки: 2017-02-23
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0.24/5
... during the Kiama hyperchron (C2–P2) probably due to magnetoviscous processes... by Polar, Cluster, Geotail, and Themis satellites obtained between 1995 and... of the magnetotail current sheet: THEMIS observations Artemyev, A.V., Petrukovich, A.A. (Space Research...) We consider two years of THEMIS observations to investigate the distribution... were studied using geostationary GOES, THEMIS, RBSP spacecrafts. The satellite observations... Pc4-5 waves. As seen by THEMIS satellites these pulsations propagate in... at radial passes 142 of THEMIS spacecraft near the IB observation... States) Measurements carried out by Themis satellites near the magnetospheric tail... of simultaneous measurements from the THEMIS satellites during February 14, 2009... at -60 Re (lunar orbit – ARTEMIS data) Kornilova, T.A., Kornilov, I.A. (Polar Geophysical... consumption) successfully finished by two Themis satellites placing at the Moon... they have new names – Themis B is Artemis P1, and Themis C – Artemis P2 (ARTEMIS - Acceleration, Reconnection, Turbulence... for 27 January 2013. Artemis P1 and P2 space separation was 0.05... of pseudobreakup type, P1 and P2 detected a rather weak increase in..., as well as at Canadian THEMIS all-sky imager array, are... cases of 165 conjugacy with THEMIS probes during the E-W activities prior... sector of the magnetosphere from THEMIS observations Kozelova, T.V., Kozelov, B.V. (Polar Geophysical... and sequent dipolarization using the THEMIS observations at the dawn sector... EMIC wave events registered by THEMIS, Cluster and Van Allen Probes... measurements in SW and MSH. THEMIS mission data obtained during 2008... of plasma sheet electrons by THEMIS, we demonstrate that a low-density... dayside magnetopause crossings by the THEMIS satellites. Moreover, we also used...



Дата загрузки: 2016-11-22
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0.05/5
... американские аппараты LRO и LADEE и два Artemis’а, а на ее поверхности – китайский («Чанъэ... орбиты. В феврале 2007 г. в рамках проекта THEMIS по изучению магнитосферных суббурь были... зондам присвоили новые названия: THEMIS B стал называться ARTEMIS* P1, а THEMIS C – ARTEMIS P2. * ARTEMIS – Acceleration, Reconnection, Turbulence...



Дата загрузки: 2017-04-08
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0.1/5
ARTEMIS: The First Mission to the ....w.woodfork@nasa.gov (2) ABSTRACT The ARTEMIS mission will be the first... regular orbit stationkeeping maneuvers. The ARTEMIS mission will build on these... to be quite accurate. The ARTEMIS mission is a collaborative effort between...). The ARTEMIS mission is part of the THEMIS extended mission. ARTEMIS comprises two of the five THEMIS spacecraft... orbit designs for the two ARTEMIS spacecraft and provide analysis results... Moon's Interaction with the Sun (ARTEMIS) mission as part of the... Macroscale Interactions during Substorms (THEMIS) mission [1]. ARTEMIS will use simultaneous measurements of..., and in the solar wind. ARTEMIS will also collect unprecedented observations... – by the solar wind [2]. The THEMIS mission comprises five identical spacecraft... the cause of geomagnetic substorms. THEMIS was launched onboard a Delta-II...) provides spacecraft operations support for THEMIS. Tracking, telemetry, and command services... (GN) and Space Network (SN).   THEMIS answered longstanding fundamental questions concerning... the more global substorm phenomena. THEMIS accomplished these tasks by employing... and geomagnetic perturbations. The five THEMIS spacecraft were placed in highly.... Initially, right after launch, the 5 THEMIS spacecraft were lined up in... achieve the mission orbits. The THEMIS mission orbits relative to the... 5: 1.5 x 10 Re Fig. 1. THEMIS Constellation Configuration The THEMIS team has achieved the primary science objectives of the THEMIS mission. The extended science mission will keep the three innermost THEMIS... now designated as ARTEMIS probes P1 and P2. The THEMIS team had long... necessary for the P1 and P2 spacecraft to avoid entering a   deep... trajectories for both P1 and P2 to insert them into Earth... orbit injections for P1 and P2 will occur in January and... Placements   Table 1. ARTEMIS Thruster Firing Modes 2. ARTEMIS TRAJECTORY DESIGN The ARTEMIS trajectory design... the left show the ARTEMIS P1 and P2 trajectories in the Sun... are a key component of the ARTEMIS trajectory design, as neither spacecraft... each spacecraft.    Fig. 3. ARTEMIS Trajectory Design Table 2. ARTEMIS Delta-V Budget Orbit Raising... P1 Cost (m/s) 103.2 6.9 4.8 0.8 89.9 205.7 P2 Cost (m/s) 233.9 11.4 29.1 1.5 117... information for the P1 and P2 spacecraft, respectively. Since the initial... ORM maneuvers are required for P2. There are a total of 5 ORMs... ORMs plus 1 FTM for P2. Both ARTEMIS spacecraft have an operational constraint... after exiting from shadow. Table 3. ARTEMIS P1 ORM Finite Burn Summary... 10.47 10.24 Table 4. ARTEMIS P2 ORM Finite Burn Summary Maneuver... proper L2 Lissajous orbit.   The P2 translunar trajectory, shown in Fig... maneuver. For both P1 and P2, we have allocated 4% of the... way. Fig. 4. ARTEMIS P1 Translunar Trajectory Design Fig. 5. ARTEMIS P2 Translunar Trajectory Design 2.3 Lissajous Phase The many months that the ARTEMIS... the lunar Lissajous orbits. The ARTEMIS science mission begins once each... Lissajous orbits for the two ARTEMIS spacecraft are illustrated in Fig.... The baseline trajectory for spacecraft P2 inserts it near the L2.... The trajectory design of the ARTEMIS constellation allows for science data... the Lissajous mission phase, each ARTEMIS spacecraft will perform a large maneuver... captured into a selenocentric orbit. Fig. 6. ARTEMIS Lissajous Trajectory Design Experience from... the current baseline for the ARTEMIS mission. We will achieve those... the lighter body (For the ARTEMIS mission, the Earth is the... is at a convenient point (for ARTEMIS, either the L1 or L2... point missions, including JWST and ARTEMIS, we are considering a “bisection” method... to this targeting approach for ARTEMIS are twofold. First, we allow... the Lissajous orbit phase, the ARTEMIS satellites will perform large orbit... P1 and 117.1 m/s for P2. Since each ARTEMIS spacecraft will have depleted... P1 and ten burns for P2 to   achieve the total delta... be in a retrograde orbit and P2 will be in a posigrade orbit... months, after which time the ARTEMIS science mission is complete. The... to the lunar surface. Fig. 8. ARTEMIS Lunar Orbits, First 90 Days... for both the P1 and P2 spacecraft. After each maneuver (or... Burn Performance Spacecraft P1 P1 P2 P2 P2 P2 P2 P2 Maneuver ORM 01 ORM 02... future maneuvers. 6. CONCLUSIONS The two ARTEMIS spacecraft are well on their... fields in the lunar regime. ARTEMIS will be a pathfinder for future... the many members of the ARTEMIS team who worked together to.... Their operations experience with the THEMIS spacecraft and ground systems engineering... tools to allow the THEMIS spacecraft to become ARTEMIS. We would like... orbit determination error analysis for ARTEMIS. We would also like a give... the inspiration for the entire ARTEMIS team. 7. REFERENCES [1] Blake J.B. et al... al, ARTEMIS Flight Dynamics Peer Review, 2008. [4] Bester, M. et al, ARTEMIS Independent...



Дата загрузки: 2017-04-09
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0.07/5
AAS 11-509 ARTEMIS LUNAR ORBIT INSERTION AND SCIENCE ... of late-July 2011, the ARTEMIS mission is transferring two spacecraft... to design the highly-eccentric ARTEMIS science orbits is outlined. The... Moons Interaction with the Sun (ARTEMIS) mission is currently operating two... with NASA’s Science Missions Directorate. ARTEMIS is an extension to the... Substorms (THEMIS) mission [1] that has relocated two of the THEMIS spacecraft from Earth orbit to the Moon [2, 3, 4]. ARTEMIS plans... ARTEMIS transfers involves moving the two ARTEMIS spacecraft, known as P1 and P2... of the design. Firstly, the ARTEMIS probes have been the first... from this location. Second, the ARTEMIS probes plan to routinely operate... outer planet moon orbiters. Further, ARTEMIS plans a number of different science... of the scientific objectives for ARTEMIS and the implications for trajectory... ORBIT PHASE SCIENCE OBJECTIVES Because ARTEMIS is both a heliophysics and a planetary... wind conditions. By having two ARTEMIS spacecraft in orbit, simultaneous two... exosphere investigations with LADEE, an ARTEMIS spacecraft must be below 200... orbit necessary to achieve the ARTEMIS science goals necessitates a lunar orbit... various natural accelerations on the P2 spacecraft during its transfer from... 9.5 or 17 months (P1 and P2, respectively), primarily driven by variation... non-Keplerian motion of the ARTEMIS probes while in lunar orbit... considered in this light, the ARTEMIS dynamics can be understood much... three-body problem. For the ARTEMIS orbits in the Earth-Moon... is also driven by the ARTEMIS spacecraft capabilities and the mission... and P2 have limited on-board fuel reserves after completing the THEMIS... spin axis (see Figure 3). The ARTEMIS spacecraft have a blowdown propulsion system... more than roughly 4 hr. Figure 3. THEMIS/ARTEMIS Spacecraft Configuration. (a) On-orbit configuration....nasa.gov/images/content/164405main THEMIS-Spacecraft bus2.jpg ); (b) spacecraft bus... time than expected. Thus, the ARTEMIS mission ops team has adopted... As part of the original ARTEMIS mission proposal in 2008, a “proof... science could be done by ARTEMIS in addition to heliophysics. The... baseline trajectory design for the ARTEMIS P1 probe is illustrated in... design for the ARTEMIS P2 probe is shown in Figure 5. P2 began its... gravity and steering losses. For ARTEMIS, the design choices are the...) LOI to science orbit. 7 Figure 5. P2 transfer from Lissajous orbit around...-2 September 2, 2011 13.2 2 37.5 30.5/7.0 P2 PRM-3 October 3, 2011 14.0 2 39... order. of these inputs for ARTEMIS were determined through human tinkering... acceleration for the 85 kg ARTEMIS spacecraft. Thus, each spacecraft must... 180 deg longitude for P2 (prograde). ARTEMIS can only measure anomalies near... potential magnetic anomaly targets for ARTEMIS. Name Longitude Extent Latitude Extent... crustal magnetic anomalies reachable by ARTEMIS. While modifying the longitudes of... in lunar orbit. For the ARTEMIS Lissajous orbits (which are maintained... from the lunar equator. Placing ARTEMIS line of apsides at dawn..., at least one of the ARTEMIS probes should be within 30... Sun approximately every 9.5 months. The P2 (prograde) orbit requires about 17... less than 200 km, the ARTEMIS mean eccentricity (Eqn. (5)) should also... the P2 approach to a prograde lunar orbit from Lissajous around EML1. ARTEMIS implemented the leftmost option on P2. Planetary enhancement... fuel. This section describes the ARTEMIS trajectory characteristics with respect to... many more measurement opportunities than P2. The P2 orbit is significantly more... of magnetic anomaly encounters by P2. Furthermore, a small fuel expenditure (order... a variety of orientations. Figure 14. ARTEMIS periapsis locations and altitudes (dots... Figure 15. ARTEMIS planned periapsis altitudes for P1 (top) and P2 (bottom... 17 months for P2. Figure 11 shows that ARTEMIS has been aligned... the lunar orbit phase of ARTEMIS was determining how ˜5 hr of... baseline solutions developed by the ARTEMIS mission team and the anticipated... orbit dynamics done during the ARTEMIS proposal development which was of... and excellent effort of the ARTEMIS operations team at the University... have successfully guided the two ARTEMIS probes from Earth orbit, through... Space Administration. REFERENCES [1] Angelopoulos, V., “The THEMIS Mission,” Space Science Reviews, doi..., V., “Preliminary Trajectory Design for the ARTEMIS Lunar Mission,” Astrodynamics 2009: Advances...-382. [3] Woodard, M., Folta, D., and Woodfork, D., “ARTEMIS: The First Mission to the..., G. J., Folta, D. C., Chung, M.-K. J., Hatch, S. J., and Woodard, M. A., “ARTEMIS Mission Design,” Space Science Reviews..., July 21, 2011. [5] Angelopoulos, V., “The ARTEMIS Mission,” Space Science Reviews, doi..., C., Schriver, D., Slavin, J., Travnicek, P., and Weygand, J., “ARTEMIS Science Objectives,” Space Science Reviews..., P., Taylor, E., Sterling, R., and Cully, M., “The THEMIS constellation,” Space Science Reviews, Vol... Earth-Moon Libration Orbiters: the ARTEMIS Mission,” presented at the 2011...



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... into two new missions – THEMIS-Low and ARTEMIS. THEMIS-Low refers to three... a new lunar mission called ARTEMIS. The two ARTEMIS probes were transferred from... 2008. [2,3] TABLE OF CONTENTS 1. INTRODUCTION .................................................1   2. ARTEMIS CONCEPT OF OPERATIONS ...............2   3. MISSION DESIGN... of the ARTEMIS mission included transfer of probes P1 and P2 from... the trajectory design. The THEMIS and ARTEMIS probes were designed and implemented... of the two ARTEMIS probes in their deployed configuration. ARTEMIS was proposed... a THEMIS mission extension, and was approved by the review panel. ARTEMIS operations... THEMIS-Low mission is discussed elsewhere. Figure 2 – Artist’s rendering of the ARTEMIS... terms, the ARTEMIS concept of operations was similar to THEMIS in the... of operations for ARTEMIS. Roles and Responsibilities Much like THEMIS, ARTEMIS used communications..., T2). Table 1. Summary of THEMIS P1 and P2 Estimated End-of-prime... of the ARTEMIS probe buses with the major RCS components. ARTEMIS science operations were very similar to those of THEMIS, except... the ARTEMIS trajectory design was to first transfer probes P1 and P2... studying options to rescue THEMIS probes P1 and P2 from freezing in... start of ARTEMIS, the THEMIS navigation processes were well established. For ARTEMIS, additional... orbit phasing completion P2 lunar orbit phasing completion Integrated THEMIS navigation software... Much like with THEMIS, orbit determination (OD) for ARTEMIS was based on... been executed during the THEMIS prime mission. For ARTEMIS a significant number of... the THEMIS prime mission down to a level near 1%, which was the ARTEMIS... of the ARTEMIS mission – 76 on P1 and 106 on P2. Great... THEMIS-Low mission. However, new capabilities were added to meet special ARTEMIS... tools for THEMIS, additional capabilities needed to be implemented for ARTEMIS. New... from the THEMIS prime mission into the new ARTEMIS and THEMIS-Low missions...) defined for the THEMIS prime mission also applied to ARTEMIS, as the..., ARTEMIS mission operations were a natural sequel to those of the THEMIS prime... meet ARTEMIS requirements. Table 2. ARTEMIS Science Data Collection Modes. Figure 6 – THEMIS and ARTEMIS operations... waveforms ~0.5 kbps Fast Survey (FS) ARTEMIS Operations Preparation Operations procedures, flight... data for THEMIS-Low and ARTEMIS was similar to the THEMIS prime mission... procedures were successfully executed. Table 3. ARTEMIS Science Operations Metrics. Parameter 2012... due to a false trip. Table 4. THEMIS & ARTEMIS Maneuver Metrics. Critical Event Coverage... command support. Maneuver Count THEMIS Prime Mission ARTEMIS THEMIS-Low 297 182 152... of the original five THEMIS probes that became ARTEMIS spent more than... THEMIS/ARTEMIS operations team in collaboration with multiple remote scheduling offices. [24] ARTEMIS..., D. Folta, M. Woodard, D. Woodfork, “Navigating THEMIS to the ARTEMIS Low-Energy Lunar Transfer... for Sun-only Attitude Determination: THEMIS Becomes ARTEMIS,” Proceedings of the 21st...-Flight Maneuver Performance for the THEMIS and ARTEMIS Mission Spacecraft,” Proceedings of..., “THEMIS Mission Networks Expansion – Adding the Deep Space Network for the ARTEMIS..., D. P. Cosgrove, S. Frey, and M. G. Bester, "Optimizing ARTEMIS Libration Point Orbit Stationkeeping Costs... support for the THEMIS mission. He became the THEMIS and ARTEMIS Navigation Lead... Lead for THEMIS and worked since then on the THEMIS and ARTEMIS missions. [21] S. B. Broschart, T. H. Sweetser, V. Angelopoulos, D. C. Folta, and M. A. Woodard, “ARTEMIS..., S. Frey, J. Marchese, B. Owens, and M. Bester, “ARTEMIS Operations from Earth-Moon Libration... attitude determination, mostly concerning the THEMIS and ARTEMIS missions. [23] J. E. Marchese, D. Cosgrove... analysis and support for the THEMIS and ARTEMIS missions. [24] M. Bester, G. Picard... Mission Operations Manager for the THEMIS, ARTEMIS, NuSTAR, and ICON missions at... as Mission Operations Manager for THEMIS, ARTEMIS, NuSTAR, and ICON. He is... systems engineer, working on the THEMIS, ARTEMIS, FAST, RHESSI, NuSTAR, and ICON... a scheduler for the RHESSI, NuSTAR, THEMIS, ARTEMIS, CINEMA, and ICON missions. Martha... flight operations with FAST, RHESSI, THEMIS, ARTEMIS, NuSTAR, CINEMA, and ICON. Jeremy... he worked on the CHIPS, THEMIS, ARTEMIS, CINEMA, NuSTAR, and ICON missions... worked on the FAST, RHESSI, THEMIS, ARTEMIS, NuSTAR, CINEMA, and ICON missions... as Instrument Support Engineer for THEMIS and ARTEMIS. ACKNOWLEDGEMENTS The authors wish... support for the NASA missions THEMIS, ARTEMIS, FAST, NuSTAR, and ICON. Gregory... as a network scheduler for THEMIS and ARTEMIS mission and science operations are.... 15 APPENDIX Figure A-1 – Illustration of ARTEMIS P1 (a.k.a. THEMIS B) lunar approach #2 (the knee... in ECI coordinates. 18 Figure A-7 – ARTEMIS P2 (a.k.a. THEMIS C) Earth departure with the last... A-8 – ARTEMIS P1 and P2 libration point obits in ECI coordinates. 19 Figure A-9 – ARTEMIS P2...



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... as underscored recently by the ARTEMIS spacecraft. Controlling the evolution of... serves as a baseline for the ARTEMIS P2 trajectory. & 2012 Elsevier Ltd. All... until August 2010 when the ARTEMIS P1 spacecraft entered an orbit... Earth–Moon L2 point. The ARTEMIS P2 probe became the second Earth.../j.actaastro.2012.07.025 The ARTEMIS libration point orbit design features... represents the path of the ARTEMIS P2 spacecraft. As will be demonstrated... sensitive Earth–Moon environment. 2. The ARTEMIS mission As the first libration... Moons Interaction with the Sun (ARTEMIS) mission represents a significant step...-body mission design and operations [8]. ARTEMIS is an extension of the... Substorms (THEMIS) mission that was launched in 2007 [9]. The THEMIS mission originally.... A rendering of a THEMIS/ARTEMIS spacecraft appears in Fig. 1. The ARTEMIS mission originated in July 2009, when two of the five THEMIS spacecraft, termed P1 and P2, initiated a series of...–Moon manifolds, the P1 and P2 spacecraft each inserted into an... point orbiting phase of the ARTEMIS mission incorporates both L1 and... quasi-periodic trajectories. Like Fig. 1. THEMIS/ARTEMIS rendering [10]. 457 most libration...-halo orbits, designed for the ARTEMIS spacecraft, are inherently unstable and... and P2 spacecraft are operating only on propellant remaining from the THEMIS... this analysis focuses on the ARTEMIS P2 orbit, the baseline trajectories for...flects the ARTEMIS baseline design as of August 2010. 2.1. The ARTEMIS P1 trajectory The Earth–Moon libration point phase of the ARTEMIS... and planar projections of the ARTEMIS P1 baseline trajectory appear in... Fig. 2(a) and (b), respectively. The Fig. 2. ARTEMIS P1 baseline trajectory. (For interpretation... equations, i.e., 2.2. The ARTEMIS P2 trajectory € _ xÀ2 yÀx ¼À Fig. 3. ARTEMIS P2 baseline trajectory. The ARTEMIS P2 spacecraft arrives in... entering orbit near L2, the P2 spacecraft immediately shifts to a path... from the L1 orbit delivers P2 to a prograde lunar arrival at.... An isometric view of the ARTEMIS P2 baseline trajectory is plotted in... to be consistent with the ARTEMIS P2 spacecraft to improve the fidelity... trajectories such as those for ARTEMIS, it is useful to complete.... For example, initial guesses for ARTEMIS-like trajectories are generated using... trajectory. For spacecraft such as ARTEMIS, with a relatively strict set of... corrections. 5. ARTEMIS P2 application An important scientific goal for the ARTEMIS mission is... of the mission, the two ARTEMIS spacecraft enter lunar orbit to... as those employed by the ARTEMIS spacecraft in such a way that..., during mission operations for the P2 spacecraft, small errors in the... to be incorporated. Thus, the P2 trajectory is employed in this...-end’’ reference trajectory representing the ARTEMIS P2 spacecraft is required for the... correction maneuver placement strategy. The P2 reference solution is designed consistent... libration point phase of the ARTEMIS P2 spacecraft and, thus, begins at... as a higher-fidelity reference, e.g., the ARTEMIS P2 baseline trajectory as displayed previously...-of-plane amplitude sensitivity The ARTEMIS P2 spacecraft emerged from the Earthto... z-amplitude, let the baseline CR3BP ARTEMIS P2 solution in the lunar region... the z-amplitude evolution of the ARTEMIS P2 spacecraft trajectory. This point is... that is experienced by the ARTEMIS P2 trajectory is difficult to... unfavorable z-amplitude evolution of the ARTEMIS P2 path is due, not to... with limited propellant such as ARTEMIS. Here, an out-of-plane... to the ARTEMIS P2 trajectory as an example. The perturbed ARTEMIS P2 trajectory, i.e., the... quasi-periodic phase of the ARTEMIS P2 trajectory. The second sample deterministic...-of-plane amplitude for the ARTEMIS P2 trajectory. However, it is dif... Earth–Moon libration point orbits, ARTEMIS spacecraft trajectories offer a number of.... This preliminary analysis employs the ARTEMIS P2 trajectory to consider the sensitivity... of the ARTEMIS P2 spacecraft. A successful set of maneuvers for the P2 spacecraft... is successfully applied to the ARTEMIS P2 spacecraft trajectory as a global-type... a variety of locations along the P2 path. In general, maneuvers are..., March 2012. M. Woodard, D. Folta, D. Woodfork, ARTEMIS: The first mission to the..., The THEMIS mission, Space Sci. Rev. 141 (1–4) (2008) 5–34. NASA, THEMIS Overview, [Accessed August 31, 2011], /http:// www.nasa.gov/mission_pages/themis...–Moon system with applications to ARTEMIS, in: Proceedings of the 20th... Earth–Moon libration orbiters: The ARTEMIS mission, in: Proceedings of the... point orbits related to the ARTEMIS mission and visualization of non...



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..., Accuracy, Lissajous, ARTEMIS ABSTRACT The ARTEMIS mission, part of the THEMIS extended mission... 2009, two of the five THEMIS spacecraft were redeployed from Earth.... Starting in August 2010, the ARTEMIS P1 spacecraft executed numerous stationkeeping... into a lunar L1 orbit. The ARTEMIS P2 spacecraft entered a L1 Lissajous orbit... 2010. In April 2011, both ARTEMIS spacecraft will suspend Lissajous stationkeeping... orbits. The success of the ARTEMIS mission has allowed the science... lunar Lissajous stationkeeping maneuvers, the ARTEMIS operations team has provided orbit... and 0.1 cm/s in velocity. The ARTEMIS team utilizes the Goddard Trajectory... David Folta †† The ARTEMIS mission, part of the THEMIS extended mission is... Lissajous station-keeping maneuvers, the ARTEMIS operations team has provided orbit... and 0.1 cm/s in velocity. The ARTEMIS team utilizes the Goddard Trajectory... in the Lissajous region. INTRODUCTION ARTEMIS is the first mission to... ARTEMIS mission comprises two identical spacecraft, referred to as ARTEMIS P1 and ARTEMIS P2, or simply P1 and P2. Each spacecraft... of the upstream solar wind. ARTEMIS two-point measurements open a new... of ARTEMIS spacecraft in lunar environment (Courtesy NASA SVS) The ARTEMIS mission is an extension of the THEMIS mission. The five THEMIS probes... the completion of the primary THEMIS mission in July 2009, a sequence... to begin the transfer of THEMIS-B and THEMIS-C from high Earth orbits... probes were designated as ARTEMIS P1 and P2, respectively. After many months... point in August 2010 and P2 was inserted into a Lissajous orbit... L2 libration point regions. Since ARTEMIS was the first mission to... analysis and methods used for ARTEMIS orbit estimation provides techniques that... similar missions. 2 ORBIT COVARIANCE ANALYSIS ARTEMIS orbit determination (OD) is performed... tracking data on the ground. ARTEMIS tracking data comes from a variety... and is not used for ARTEMIS orbit determination in the L1... on the ARTEMIS ground stations and their tracking capabilities. Table 1. ARTEMIS Tracking... & Doppler UTDF: Doppler Prior to ARTEMIS Lissajous orbit insertion, GSFC needed... baseline tracking schedule for each ARTEMIS spacecraft is as specified in... data plan is valid for ARTEMIS maneuver planning. Inclusion of BGS... accuracies. Figure 2. ARTEMIS 3σ Position Errors from Covariance Analysis 4 Figure 3. ARTEMIS 3σ Velocity Errors from Covariance Analysis OPERATIONAL ORBIT DETERMINATION UCB performs ARTEMIS... email to members of the ARTEMIS support team. These activities are...-squares method to estimate the ARTEMIS orbit from received tracking data... specified (for the ARTEMIS mission) in the ARTEMIS Models and Constants document... Lissajous orbital phase of the ARTEMIS mission, orbit determinations performed by... ‘a priori’ values (for P1 and P2), the details of which are...-Squares Orbit Determination Trending 7 Figure 5. P2 Batch Least-Squares Orbit Determination... one of the planned weekly P2 station-keeping maneuver as the... determination results for the two ARTEMIS spacecraft obtained by processing ground... the ARTEMIS ground tracking system and the transponder biases on each ARTEMIS... in setting up ODTK for ARTEMIS and processing of tracking data... Multi-Body Dynamical Environments: The ARTEMIS Transfer Trajectory Design,” Proceedings of..., Czech Republic, Sep. 2010. 2 T. Sweetser, "ARTEMIS Mission Design", Space Science Reviews..., S. Gandhi, and M. Bester, “Navigating THEMIS to the ARTEMIS Low-Energy Lunar Transfer..., “THEMIS Mission Networks Expansion – Adding the Deep Space Network for the ARTEMIS... (ODEAS) User’s Guide", 1993. 8 T. Sweetser, "ARTEMIS Models and Constants", 2009. 16



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... and Macroscale Interactions during Substorms (THEMIS) mission (5 identically-instrumented probes) was... with the Sun (ARTEMIS) mission. The combined THEMIS/ARTEMIS mission is an important... implementation of THEMIS orbit changes to produce an optimal THEMIS-MMS tetrahedral... de-orbit. Keywords: Mission design, THEMIS, magnetospheric constellation, maneuver planning. 1. Introduction... and Macroscale Interactions during Substorms (THEMIS), a NASA Medium Explorer (MIDEX) mission... extended THEMIS mission. In 2010 the other two probes (P1, P2) were... with the Sun (ARTEMIS) mission.The combined THEMIS/ARTEMIS mission is an important... wind by WIND, ACE, and ARTEMIS characterize the geomagnetic impact of.../]. Combining these spacecraft with the THEMIS probes in a tetrahedral formation at... conduct magnetospheric studies. The THEMIS and ARTEMIS probes are equipped with onboard... relative positioning of the three THEMIS probes to support measurements coordinated... THEMIS-MMS conjunctions. The challenge here is to leave room for THEMIS... conclude with a short summary. Figure 2: THEMIS probes at their proposed (left... Drive Orbit Design 2.1 THEMIS Nominal Mission 2007-2009 THEMIS is a science mission... Sun-Earth connection [2]. When the THEMIS mission was developed, geomagnetic substorms... questions about event timing. 3 The THEMIS baseline mission focused solely on... sheet) [4]. Table 1. Orbit parameters for THEMIS probes during the nominal mission... solar wind. These separations allowed THEMIS to dedicate secondary and tertiary... of the THEMIS mission into the extended THEMIS and ARTEMIS missions in 2010... panel shows the ARTEMIS (P1, P2) and the extended THEMIS mission (P3, P4.... Once per lunar cycle the ARTEMIS probes pass through the center... opposite side of Earth, the ARTEMIS probes measure the incoming solar... assets via onboard propulsion. Each THEMIS probe has a monopropellant hydrazine propulsion... [4]. With at least 24 unprecedented THEMIS tail conjunctions such as those... more than 100 substorms studied, THEMIS observations enabled determination of the..., shown in Fig. 3. In the ARTEMIS mission, both probes were sent... [http://www.nasa.gov/mission_pages/artemis/#.U1XEy1eGdow]. The plan for the... the magnetosphere. With these observations THEMIS advanced from the macro-scale... into a stretched tail field. Figure 6: THEMIS clustered meridional configuration during the... equatorial magnetosphere illustrating how the THEMIS probes cover various local times... equal separations of 8-8-8 h. Early key THEMIS results on the dayside included... consequences through local particle acceleration. THEMIS nightside results confirmed that quiet... events when the dipole expands. THEMIS observations have also provided evidence.... 2.3. Future THEMIS Extended Mission 2015-2018 Ever since in orbit THEMIS has... continuous complementary observations. Because of THEMIS’s large-scale separations, at least... THEMIS, MMS, and Van Allen probes inside the equatorial magnetosphere. The ARTEMIS probes P1 and P2 are shown crossing the... phase one. THEMIS is shown with the inner probes (THEMIS low) P3... and THEMIS P3 at ~16 Re. Now in its eighth year, THEMIS.... At the same time the ARTEMIS probes will monitor the solar... magnetosphere. As shown in Fig. 8, THEMIS will link reconnection observations by... the extended THEMIS mission included the possibility of aligning THEMIS orbits with... rate of the THEMIS lines of apsides so THEMIS probes would meet... fine-tuned the THEMIS orbit drift rate to optimize THEMIS-MMS alignment... the THEMIS orbits are being coordinated with the MMS team. THEMIS MMS... that this new reconfiguration of THEMIS orbits leave insufficient fuel reserves... after MMS has been launched. THEMIS demonstrated this flexibility prior to... an apogee of 14 Re [2]. 3. THEMIS Extended Mission Implementation Significant fuel... fuel consumption. Attitude controls on THEMIS, necessary once or twice per... they may impart. All THEMIS and ARTEMIS maneuvers have been prepared and... an updated mission design. The THEMIS extended mission alternates between microsystem... goals inside the magnetosphere, and ARTEMIS provides global context. The science... THEMIS probe separations with the Van Allen Probes. The 14 proposed THEMIS... across missions. 7. Acknowledgments The THEMIS and ARTEMIS missions are operated by the... NAS5-02099. 7. References [1] Sibeck, D.G., V. Angelopoulos, THEMIS science objectives and mission phases...-008-9393-5, 2008. [2] Angelopoulos, V., The THEMIS mission, Space Science Reviews, 141..., E. Donovan, B. Jackel, M. Greffen, L.M. Peticolas, The THEMIS array of ground-based observatories..., D. Rummel, Orbit design for the THEMIS mission, Space Science Reviews, 114..., V., and D. G. Sibeck, THEMIS Senior Review Proposal, 2010, http://themis.igpp.ucla.edu/pubs/reports/2010_proposals_reports.html. [6] Angelopoulos, V., and D. G. Sibeck, THEMIS Senior Review Proposal, 2013, http://themis.igpp.ucla.edu.... Crossings of Geostationary orbit by THEMIS scientific satellites, Proceedings 23th International...