Спутник ФКИ. THEMIS-B (ARTEMIS-P1). [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-P1НайтиНайти
3Explorer 86НайтиНайти
4ARTEMIS-P1НайтиНайти
530581НайтиНайти

Дополнительная классификация

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

Технические характеристики

#ХарактеристикаЗначение
1Масса, кг77
2Мощность, Вт37

Пусковые характеристики

#ХарактеристикаЗначение
1Код NSSDC2007-004B

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 80 документов по запросу «THEMIS-B (ARTEMIS-P1)». [Перейти к поиску]


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0.63/5
AAS 12-182 OPTIMIZING ARTEMIS LIBRATION POINT ORBIT STATIONKEEPING COSTS ... orbit Earth-Moon libration points—ARTEMIS P1 and P2—performed a combined total.... It expands on previously reported THEMIS/ARTEMIS maneuver calibration techniques and results... to 14.2 days. INTRODUCTION The P1 and P2 spacecraft of the... 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 0.90... ∆V and SMA Targeting data for THEMIS C (ARTEMIS P2). As shown in Figure... Targeting Throughout the THEMIS primary mission and ARTEMIS low-energy transfer to...°—starting on SKM 10 for P1 and SKM 4 for P2. A total... Statistics for Several Subsets of ARTEMIS Lissajous Stationkeeping Maneuvers. (Year/DOY...-05 1.20E-05 1.00E-05 P1 8.00E-06 P2 6.00E-06... of the ∆V magnitude error during ARTEMIS Lissajous orbit operations with a line... time between stationkeeping maneuvers. Throughout ARTEMIS Lissajous orbit operations, the calibration... the Lissajous orbit insertions for P1 8 and P2. Moreover, almost all... time for SKM 16 for P1 and SKM 12 for P2... Calibration -5 Pulse Width (deg) Figure 5. ARTEMIS P1 CENDIS for maneuvers between initial... Calibration -9 Pulse Width (deg) Figure 6. ARTEMIS P2 CENDIS for maneuvers between... of 0.99° and 0.78° for P1 and P2, respectively, for multi... maneuvers that small in magnitude. ARTEMIS P1 instrument sphere loss anomaly On... instrument sphere unexpectedly detached from ARTEMIS P1 and imparted a 5.67 cm/s ∆V on... from -0.000838 on P1 SKM 5 to -0.04022 on P1 SKM 6. Moreover, the... insertion. FUTURE WORK Now that ARTEMIS Lissajous orbit operations have ceased... to anomalies encountered by the ARTEMIS and THEMIS-Low spacecraft. For example, the new spin-down characteristics for P1... team to a significant anomaly on P1. These results underscore the importance... the P1 lunar orbit insertion. However, as demonstrated during the THEMIS and ARTEMIS... their stationkeeping maneuver designs for ARTEMIS P1 and P2. Thanks are also... 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 P1... size and error statistics for ARTEMIS P2’s Lissajous stationkeeping maneuvers. Maneuver...-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...



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0.2/5
... that the source of pro- THEMIS sent to investigate Aurora; they... www.foxnews.com/topics/space/themis-mission.htm duced IMF is... Pioneer-V experiment using NASA’s THEMIS satellites. ARTEMIS-P1 is to be stationed at..., ARTEMIS-P2 and ARTEMIS-P3 at 13.0RE and 12.5RE, while ARTEMIS-P4 and ARTEMIS-P5 to be located around the two poles. five THEMIS... by repeating Pioneer-V experiment using THEMIS satellites. (http://www.nasa.gov...



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0.09/5
.../spacecraftDisplay.do?id=2007-004B (THEMIS-B / ARTEMIS-P1) http://nssdc.gsfc.nasa.gov...



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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... would be necessary for the P1 and P2 spacecraft to avoid...) designed transfer trajectories for both P1 and P2 to insert them.... The translunar orbit injections for P1 and P2 will occur in... Placements   Table 1. ARTEMIS Thruster Firing Modes 2. ARTEMIS TRAJECTORY DESIGN The ARTEMIS trajectory design... on the left show the ARTEMIS P1 and P2 trajectories in the... 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... increase End of mission deorbit P1 Cost (m/s) 103.2 6.9 4.8 0.8 89.9 205.7 P2... plan summary information for the P1 and P2 spacecraft, respectively. Since... for P1 and 27 ORMs plus 1 FTM for P2. Both ARTEMIS spacecraft... after exiting from shadow. Table 3. ARTEMIS P1 ORM Finite Burn Summary Maneuver... 10.47 10.24 Table 4. ARTEMIS P2 ORM Finite Burn Summary... the first lunar swingby, the P1 spacecraft flies under the Earth.... Following the Earth swingby, the P1 spacecraft flies into the general... the final bend in the P1 trajectory, the spacecraft is at... will be performed to insert P1 into the proper L2 Lissajous... orbit insertion maneuver. For both P1 and P2, we have allocated... the way. Fig. 4. ARTEMIS P1 Translunar Trajectory Design Fig. 5. ARTEMIS P2 Translunar Trajectory... The many months that the ARTEMIS team spends performing orbit raising... the lunar Lissajous orbits. The ARTEMIS science mission begins once each... ARTEMIS spacecraft are illustrated in Fig. 6. The baseline trajectory for the P1... will be performed to maintain P1 in the L2 orbit for.... 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... 89.9 m/s for P1 and 117.1 m/s for P2. Since each ARTEMIS spacecraft will... to   achieve the total delta-v. P1 will be in a retrograde orbit... months, after which time the ARTEMIS science mission is complete. The... to the lunar surface. Fig. 8. ARTEMIS Lunar Orbits, First 90 Days... been performed for both the P1 and P2 spacecraft. After each... & Actual Finite Burn Performance Spacecraft P1 P1 P2 P2 P2 P2 P2... 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...



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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... the ARTEMIS transfers involves moving the two ARTEMIS spacecraft, known as P1 and... 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... science orbit (the accelerations on P1 are qualitatively similar). The magnitude... oscillates every 9.5 or 17 months (P1 and P2, respectively), primarily driven... 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... fuel reserves after completing the THEMIS mission objectives and moving to... 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... design for the ARTEMIS P1 probe is illustrated in Figure 4. P1 began its... transfer initiation (LTI) maneuver. The P1 lunar orbit insertion (LOI) maneuver... P1 are given in Table 1. The baseline trajectory design for the ARTEMIS... gravity and steering losses. For ARTEMIS, the design choices are the... minima. The best values 6 Figure 4. P1 transfer from Lissajous orbit around... order. of these inputs for ARTEMIS were determined through human tinkering... was considered very important that P1 maneuver and maneuver preparation activities... acceleration for the 85 kg ARTEMIS spacecraft. Thus, each spacecraft must... 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...-plane ∆V ‡ . With these maneuvers, the P1 spacecraft can reach periapsis latitudes... from the lunar equator. Placing ARTEMIS line of apsides at dawn..., at least one of the ARTEMIS probes should be within 30... 10. Evolution of the integrated P1 baseline trajectory inclination and periapsis... less than 200 km, the ARTEMIS mean eccentricity (Eqn. (5)) should also... orbit from Lissajous around EML1. ARTEMIS implemented the leftmost option on... fuel. This section describes the ARTEMIS trajectory characteristics with respect to... a variety of orientations. Figure 14. ARTEMIS periapsis locations and altitudes (dots...). 16 Figure 15. ARTEMIS planned periapsis altitudes for P1 (top) and P2... P2. Figure 11 shows that ARTEMIS has been aligned such that... to their respective science orbits. P1 has successfully completed a three-segment... 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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0.27/5
... 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... THEMIS-Low, and continued their magnetospheric observations in Earth orbits. Probes P1... goal of the ARTEMIS mission included transfer of probes P1 and P2... 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... (T1, T2). Table 1. Summary of THEMIS P1 and P2 Estimated End-of... components. ARTEMIS science operations were very similar to those of THEMIS, except... of the ARTEMIS trajectory design was to first transfer probes P1 and... began studying options to rescue THEMIS probes P1 and P2 from freezing... start of ARTEMIS, the THEMIS navigation processes were well established. For ARTEMIS, additional... P1 lunar orbit phasing completion P2 lunar orbit phasing completion Integrated THEMIS... 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... since begin of the ARTEMIS mission – 76 on P1 and 106 on... 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... data for THEMIS-Low and ARTEMIS was similar to the THEMIS prime mission.... Table 3. ARTEMIS Science Operations Metrics. Parameter 2012 2013 P1 Instrument Efficiency P1 Data... 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... 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... 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... represents the equatorial plane. Figure A-2 – ARTEMIS P1 lunar flyby #1, back-flip, and... #2 in ECI coordinates. 16 Figure A-3 – ARTEMIS P1 lunar flyby #1, back-flip, and... to be carefully analyzed. Figure A-4 – ARTEMIS P1 final Earth orbits, trans-lunar... in ECI coordinates. 17 Figure A-5 – ARTEMIS P1 EM L2 and EM L1...-Moon plane from above. Figure A-6 – ARTEMIS P1 complete trajectory from Earth departure... 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... A-1. Summary of ARTEMIS Maneuvers and Fuel Budgets. Probe P1 Mission Phase Maneuvers...



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0.31/5
..., 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 maneuvers... into a lunar L1 orbit. The ARTEMIS P2 spacecraft entered a L1 Lissajous... 2010. In April 2011, both ARTEMIS spacecraft will suspend Lissajous stationkeeping... orbits. The success of the ARTEMIS mission has allowed the science... in the lunar Lissajous regions. P1 Orbit in Earth-Moon X-Y Lissajous Plane P1 Orbit in Earth-Moon X-Z Lissajous... 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... 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... two probes were designated as ARTEMIS P1 and P2, respectively. After many... many carefully planned orbit maneuvers, P1 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... determine optimal ‘a priori’ values (for P1 and P2), the details of... subjects for further development. Figure 4. P1 Batch Least-Squares Orbit Determination... across Variable Tracking Data Arcs P1 SPACECRAFT ANOMALY On October 14... and range rate for the P1 GTDS orbit solution, as illustrated... Figure 7. Range Residuals Before & After P1 Anomaly 11 Figure 8. Range Rate Residuals Before & After P1 Anomaly Personnel from Analytical Graphics... near the beginning of the P1 Lissajous phase and included DSN..., during, and after the P1 stationkeeping maneuver #2 (P1 SKM2). The tracking arc... 2010 12:59:30 UTC. P1 SKM2 was a 59.38 cm... data arc. 13 Figure 10. P1 Orbit Determination Position Uncertainties from Kalman Filter Figure 11. P1 Orbit Determination Velocity Uncertainties from Kalman Filter 14 Figure 12. P1 Orbit Determination Position Uncertainties from... Filter & Recursive Smoother Figure 13. P1 Orbit Determination Velocity Uncertainties from... 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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... Earth radii) using data from ARTEMIS on the dusk flank magnetopause...-Earth line. Simultaneous observations by THEMIS on the dayside magnetopause indicate... from the dayside magnetopause to ARTEMIS is 30 min, and the... of the FTEs observed by THEMIS and ARTEMIS, the magnetic field geometry... line is a linear extension to ARTEMIS P1. In Figure 1b, the circle... magnetopause at the x location of ARTEMIS P1. ends, or open to the... magnetic flux into the magnetotail. [5] THEMIS and ARTEMIS [Angelopoulos, 2008, 2011; Sibeck... we present new observations from ARTEMIS showing the survival of FTE... measurements are complemented by simultaneous THEMIS measurements of the dayside magnetopause... there. 2. Overview of the Observations [6] THEMIS initially consisted of five identical... (P1 and P2) were removed from the THEMIS constellation to form ARTEMIS, and... present observations were made after P1 had been inserted into a Lissajous... 20 September 2010 the THEMIS and ARTEMIS satellites were simultaneously observing both... of the magnetosphere (Figure 1a). ARTEMIS P1 was on the dusk flank... et al. [1991] model) while THEMIS P4 crossed the dayside magnetopause... the nose of the magnetosphere. ARTEMIS P2 was on the dawn... magnetopause at the x-location of ARTEMIS P1. [8] Figure 2 shows an overview of... inter-comparison of Wind and THEMIS P4 data in the magnetosheath.... Based on the location of P1 and the measured magnetosheath flow... RE) to the flanks where P1 was situated. This advection time... at P1 (at the end of the interval shown in Figure 2). 3. ARTEMIS P1 Dusk Flank Magnetopause Observations [9] At 18:00 UT, P1 was... configuration [Maezawa et al., 1997]. P1 subsequently returns to the magnetosheath... system, lagged by 87 min. (d–h) ARTEMIS P1 ion energy flux spectrogram, ion... components and magnetic field strength. (i–m) THEMIS P4 ion energy flux spectrogram... FLUX TRANSFER EVENTS A08222 Figure 3. (a, b) ARTEMIS-P1 electron and ion energy flux... expected from the location of P1 shown in Figure 1, the local... more detail in section 5. [11] P1 observed four enhancements in the... Àx/+z direction), it therefore appears that P1 encountered the first two FTEs... regions of the third Figure 4. (a, b) ARTEMIS-P1 observations of FTE #3 and the...], with an impact factor Figure 5. (a, b) ARTEMIS-P1 observations of FTE #4 and the... FLUX TRANSFER EVENTS A08222 Figure 6. (a, b) THEMIS-P4 electron and ion energy... with the overall trajectory of P1 being directed from the magnetosheath... plane of the local magnetopause. 4. THEMIS P4 Subsolar Magnetopause Observations [17.... Similar observations were made by THEMIS P3 and P5 located nearby... observed on the flank by ARTEMIS, it does indicate that under... [19] The observations made by P1 are most consistent with the... the tail flank closer to P1. The appearance of the plasma... a dawn-dusk component, recent Cluster/ THEMIS/Double-Star observations indicate that... 7. This is consistent with the THEMIS P4 observations. [22] As the... with the observations made by ARTEMIS P1. The model predicts that the... oriented northsouth, (as seen by ARTEMIS P1 at zGSM < 0) but near the... orientation of the FTE at ARTEMIS P1, and its possible extension toward... a force-free configuration. [24] At P1, if it is assumed that... et al., 2006]. [25] At THEMIS P4, the flow speed parallel... this using electron distributions since P1 was in slow survey mode.... Given that the modeling indicates P1 passed close to the center.... 6. Conclusions [27] Novel data from ARTEMIS has led to the discovery... created locally. Simultaneous observations from THEMIS on the dayside magnetopause show... FTEs. The FTE size at ARTEMIS is 2–4 times greater than that... generated by the FTEs at ARTEMIS can be explained by considering... to whether the FTEs at ARTEMIS are open or closed. Indeed... the magnetotail. Other data from ARTEMIS, together with simulations, should be... use of data from the THEMIS Mission, specifically D. Larson and R. P. Lin... EVENTS References Angelopoulos, V. (2008), The THEMIS mission, Space Sci. Rev., 141...-008-9336-1. Angelopoulos, V. (2011), The ARTEMIS mission, Space Sci. Rev., 165.../JA089iA12p10709. Sibeck, D. G., et al. (2011), ARTEMIS Science Objectives, Space Sci. Rev...



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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... until August 2010 when the ARTEMIS P1 spacecraft entered an orbit near... Earth–Moon L2 point. The ARTEMIS P2 probe became the second.../j.actaastro.2012.07.025 The ARTEMIS libration point orbit design features... represents the path of the ARTEMIS P2 spacecraft. As will be... 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... and Earth–Moon manifolds, the P1 and P2 spacecraft each inserted... point orbiting phase of the ARTEMIS mission incorporates both L1 and... quasi-periodic trajectories. Like Fig. 1. THEMIS/ARTEMIS rendering [10]. 457 most libration... ARTEMIS spacecraft, are inherently unstable and sensitive to perturbations. Since both P1... on propellant remaining from the THEMIS mission, efficient stationkeeping and... this analysis focuses on the ARTEMIS P2 orbit, the baseline trajectories...flects the ARTEMIS baseline design as of August 2010. 2.1. The ARTEMIS P1 trajectory The Earth–Moon libration point phase of the ARTEMIS P1 trajectory... on August 23, 2010. The P1 spacecraft orbits near the L2.... After departing the L1 vicinity, P1 is delivered into a retrograde lunar... and planar projections of the ARTEMIS P1 baseline trajectory appear in a Moon... Fig. 2(a) and (b), respectively. The Fig. 2. ARTEMIS P1 baseline trajectory. (For interpretation of..., i.e., 2.2. The ARTEMIS P2 trajectory € _ xÀ2 yÀx ¼À Fig. 3. ARTEMIS P2 baseline trajectory. The ARTEMIS P2 spacecraft.... An isometric view of the ARTEMIS P2 baseline trajectory is plotted... to be consistent with the ARTEMIS P2 spacecraft to improve the... 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... of the mission, the two ARTEMIS spacecraft enter lunar orbit to... as those employed by the ARTEMIS spacecraft in such a way that...-end’’ reference trajectory representing the ARTEMIS P2 spacecraft is required for... libration point phase of the ARTEMIS P2 spacecraft and, thus, begins... as a higher-fidelity reference, e.g., the ARTEMIS P2 baseline trajectory as displayed...-of-plane amplitude sensitivity The ARTEMIS P2 spacecraft emerged from the... z-amplitude, let the baseline CR3BP ARTEMIS P2 solution in the lunar... the z-amplitude evolution of the ARTEMIS P2 spacecraft trajectory. This point... that is experienced by the ARTEMIS P2 trajectory is difficult... unfavorable z-amplitude evolution of the ARTEMIS P2 path is due, not... with limited propellant such as ARTEMIS. Here, an out-of-plane... to the ARTEMIS P2 trajectory as an example. The perturbed ARTEMIS P2... quasi-periodic phase of the ARTEMIS P2 trajectory. The second sample...-of-plane amplitude for the ARTEMIS P2 trajectory. However, it is... Earth–Moon libration point orbits, ARTEMIS spacecraft trajectories offer a number of.... This preliminary analysis employs the ARTEMIS P2 trajectory to consider the... observed during operations of the ARTEMIS P2 spacecraft. A successful set of... is successfully applied to the ARTEMIS P2 spacecraft trajectory as a global..., 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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... literally all of NASA’s manned ARTEMIS Spacecraft Prepare for Lunar Orbit... skills and technical capabilities. n GoddardView ARTEMIS Spacecraft Prepare for Lunar Orbit... next. This summer, the two ARTEMIS spacecraft—which began their lives... and Macroscale Interaction during Substorms (THEMIS) mission studying Earth’s aurora—will... Caption: Artist concept of the ARTEMIS spacecraft in orbit around the... a gravitational point in ARTEMIS P1 and 27 for ARTEMIS P2. space marked by.... ARTEMIS P1 made the leap—in an arc under The journey for ARTEMIS... side of the 2009, after THEMIS had completed some two years... orbits for the two outermost THEMIS spacecraft had slipped over time... distance from the Moon. In THEMIS spacecraft. The Principal Investigator for... Sibeck, the project manager for THEMIS and ARTEMIS at Goddard. “The Moon... had been involved with launching THEMIS in the first place: study... daily. Volume 7 Issue 4 July 2011 ARTEMIS Spacecraft Prepare for Lunar Orbit... crucial. On October 14, the P1 spacecraft orbit and attitude changed.... Goddard Updates 09 However, the ARTEMIS team also noticed that the... 190 pounds—but it adjusted ARTEMIS P1’s speed enough that had they... on course. As it is, ARTEMIS will make it to the... January 9, 2011, ARTEMIS P1 jumped over the Moon and joined ARTEMIS P2 on... to begin. On June 27, P1 will spiral in toward the... the Moon, or in prograde; P1 will travel in the opposite... choices. “We’ve been monitoring ARTEMIS every day and developing maneuvers... be back to just being ARTEMIS consultants.” n Volume 7 Issue 4 July 2011...