PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM LABEL_REVISION_NOTE = " 2014-11-21 GEO:slavney Original; 2014-12-22 GEO:slavney Updated with excerpts from Kato et al. 2010;" OBJECT = INSTRUMENT_HOST INSTRUMENT_HOST_ID = "KAGUYA" OBJECT = INSTRUMENT_HOST_INFORMATION INSTRUMENT_HOST_NAME = "KAGUYA" INSTRUMENT_HOST_TYPE = "SPACECRAFT" INSTRUMENT_HOST_DESC = " Information in this description was excerpted from KATOETAL2010. Instrument Host Overview ========================= The Kaguya (SELENE) consisted of three spacecraft: a three-axis-controlled main orbiter, and two spin stabilized subsatellites. Dimensions of the main orbiter were 2.0 x 2.0 x 4.3 m, a rectangular parallelepiped, and the two sub-satellites were both octagonal prisms of 0.9x0.9x1.1 m and 50 kg. The total wet mass at launch was about 3 tons, which included 1.1 tons of fuel, the two subsatellites, and about 300 kg of total science instruments. The main orbiter carried the two subsatellites on its roof. Deployments of a solar array paddle and a high-gain antenna, and mid-course maneuvers for phase adjustment were carried out in a transfer orbit to the Moon. Initially, on October 3, 2007, the Kaguya was inserted into an elliptical orbit with a perilune 100 km altitude and an apolune 13,000 km of an inclination 90 degrees. The two subsatellites were released halfway to the circular orbit of 100 km altitude. The altitude of the apolune was gradually lowered by decelerations at the perilune to the nominal orbit. During this time one subsatellite, the relay satellite (Okina) was cast off by spinning on an elliptical orbit of 100 km and 2,400 km, and the other subsatellite, the VLBI satellite (Ouna) was released by spinning on an elliptical orbit of 100 km and 800 km. On October 19, 2007, about a month after launch, the Kaguya was settled into the nominal circular orbit of 100 km altitude. Spacecraft Description ====================== Main Orbiter Kaguya ------------------- Mass Dry Mass: 1,791 kg Launch Mass: 3,020 kg incl. fuel 1,115 kg, two subsatellites, and science instruments 275.4 kg Orbit Circular orbit of altitude 100+/-30 km with inclination 90 deg. in nominal mission period Electric Power 3.260 kW @ Beta 0 deg. and 1.831 kW @ 90 deg. Attitude Control Three-axis controlled using momentum wheels Mission Period One year nominal and extended Extended mission started on November 1, 2008 and terminated on June 10, 2009 by impact Dimension Upper module: 2.1 mx2.1 mx2.8 m parallelpiped Lower module: 2.1 mx2.1 mx1.4 m parallelpiped Propulsion 500N x 1, 20N x12, 1N x8 thrusters Relay satellite Okina and VLBI satellite Ouna --------------------------------------------- Mass 57 kg each incl. science instruments RSAT-1 12.94 kg and VRAD-1 2.20 kg for Okina, VRAD-2 10.46 kg for Ouna Orbits Elliptical orbits of altitudes 100x2400 km for Okina and 100 x 800 km at separation with inclination 0 deg. Orbital periods 240 min. for Okina and 150 min. for Ouna Electric Power 69 watt @ Beta 0 deg. Attitude Control Spin stabilized within 20 deg. normal to the lunar orbital plane Mission Period One year nominal Okina impacted on lunar farside February 12, 2009 Telemetry command operation terminated on June 29, 2009 for Ouna Dimension 0.99 mx0.99 mx0.65 m octagonal prism Kaguya Science Instruments ========================== There were 15 science instruments carried by the three spacecraft, with 11 carried by the main orbiter. 1. Gamma Ray Spectrometer (GRS) and 2. X-ray Spectrometer (XRS) for measurement of surface elemental abundances; 3. Multiband Imager (MI), a multispectral imaging system; 4. Spectral Profiler (SP), a spectrometer that collected spectra along the groundtrack of the spacecraft; 5. Terrain Camera (TC), a stereo mapping camera; 6. Lunar Radar Sounder (LRS) and 7. Laser Altimeter (LALT) for altimetric measurements; 8. Relay Satellite Transponder (RSAT), and 9. Very Long Baseline Interferometry Radio Source (VRAD) to measure the gravity field of the lunar farside and nearside; 10. Charged Particle Spectrometer (CPS), 11. Lunar Magnetometer (LMAG), 12. Plasma Energy, Angle, Composition Experiment (PACE), 13. Radio Science, and 14. Upper Atmosphere Plasma Imager (UPI) to determine the impact of cosmic radiation and/or solar wind on the Moon and Earth; and 15. High Definition Television (HDTV) used for public outreach. " END_OBJECT = INSTRUMENT_HOST_INFORMATION OBJECT = INSTRUMENT_HOST_REFERENCE_INFO REFERENCE_KEY_ID = "KATOETAL2010" END_OBJECT = INSTRUMENT_HOST_REFERENCE_INFO END_OBJECT = INSTRUMENT_HOST END