Mission Information
MISSION_NAME KAGUYA
MISSION_ALIAS SELENE

SELENOLOGICAL AND ENGINEERING EXPLORER

MISSION_START_DATE 2007-09-14T12:00:00.000Z
MISSION_STOP_DATE 2009-06-10T12:00:00.000Z
MISSION_DESCRIPTION
The Japanese lunar orbiter Kaguya (SELENE) was successfully 
      launched on September 14, 2007 and entered its nominal 100 km 
      circular orbit on October 19, 2007. Acquisition of scientific 
      data was carried out for 10 months of nominal mission that began 
      in mid-December 2007 and included an 8-month extended mission.  
      The Kaguya spacecraft impacted the Moon on June 10, 2009. Data 
      are archived at
      http://l2db.selene.darts.isas.jaxa.jp.  The mission is described 
      in KATOETAL2010. The following information is taken from that source.  
            
      SPACECRAFT AND SCIENCE PAYLOAD
      ==============================
      
      The mission included a large orbiter and two subsatellites 
      (KATOETAL2010).  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.
MISSION_OBJECTIVES_SUMMARY
The primary science objectives of the Kaguya mission were:
      - To determine the chemical constituents of the Moon,
      - To determine the interior structure of the Moon, 
      - To explore the dichotomy of the nearside and farside of the Moon,
      - To explore differentiation in the magma ocean,
      - To determine the origin of the lunar magnetic field, and
      - To look for evidence of lunar tectonics.
      
      Major scientific achievements as of the publication of KATOETAL2010
      include:
      - Identification of ubiquitous pure anorthosite in outcrops of 
        central peaks of large craters by MI and SP.
      - Discovery of multiple reflectors of radio waves under large mares 
        in the nearside by LRS.
      - Use of RSAT for confirmation of free-air gravity anomaly in the 
        whole Moon and identification of farside anomalies that are different 
        from nearside mass concentration anomalies.
      - Confirmation of lunar global topography by LALT.
      - Re-estimation of crustal thickness by Kaguya data of gravity and 
        topography.
      - Re-estimation of the formation ages of farside mares by crater 
        countings using high resolution images of TC.
      - Confirmation of magnetic anomalies and mini-magnetosphere by LMAG and 
        PACE.
      - Reconfirmation of global distribution of radio-active elements K, U 
        and Th by GRS.
      - Discovery of SW proton reflection from the lunar surface, SW entry 
        into lunar wake, and interaction with the Moon by PACE.
      - Confirmation of the polar illumination rate by LALT topographic data.
REFERENCE_DESCRIPTION