2009, the orbit was lowered to ± , and impact occurred at 18:25 UTC on June 10, 2009. Design The mission featured three separate spacecraft: Main orbiter Shape: octagonal prism Mass: Size: 2.1 x 2.1 x 4.8 m (6.9 x 6.9 x 16 ft) Attitude control: Three-axis stabilized Power: 3.5 kW (Max.) Mission period: 1 year Mission orbit: Circular, Inclination: 90 degrees Okina (small relay satellite) Okina (formerly Rstar) and Ouna (formerly Vstar) were octagonal prisms to support radio science. Okina relayed radio communications between the orbiter and the Earth when the orbiter was behind the Moon. This allowed, for the first time, the direct Doppler shift measurements needed to precisely map the gravitational field of the lunar farside; previously, the farside gravity field could only be inferred by nearside measurements. The relay satellite impacted the lunar farside near the Mineur D crater at 19:46 JST (10:46 UTC) on February 12, 2009. Function: two-way radio science relay, orbiter-earth Mass: Size: 1.0 x 1.0 x 0.65 m (3.3 x 3.3 x 2.1 ft) Attitude control: spin-stabilized Power: 70 W Initial orbit: Inclination: 90 degrees Ouna (VLBI satellite) Ouna used Very Long Baseline Interferometry as a second way to map the Moon's gravity field. It was especially useful at the lunar limb, where the gravitational acceleration is perpendicular to the line of sight to earth, making Doppler measurements unsuitable. Function: VLBI radio science Mass: Size: 1.0 x 1.0 x 0.65 m (3.3 x 3.3 x 2.1 ft) Attitude control: spin-stabilized Power: 70 W Initial orbit: Inclination: 90 degrees Payload SELENE carried 13 scientific instruments "to obtain scientific data of the lunar origin and evolution and to develop the technology for the future lunar exploration": Terrain camera (TC) (resolution 10 meters [33 ft] per pixel) X-ray fluorescence spectrometer (XRS) Lunar magnetometer (LMAG) Spectral profiler (SP) (resolution per pixel: 562 x 400 m [1840 x 1310 ft) Multi-band imager (MI) (resolution of visible light 20 [66 ft] meters per pixel, near-infrared 62 meters [200 ft] per pixel) Laser altimeter (LALT) Lunar radar sounder (LRS) Gamma ray spectrometer (GRS) Charged particle spectrometer (CPS) Plasma analyzer (PACE) Upper atmosphere and plasma imager (UPI) Radio wave repeater (RSAT) aboard Okina Radio wave source for VLBI (VRAD) aboard Okina and Ouna Two 2.2 megapixel CCD HDTV cameras, one wide-angle and one telephoto, were also on board, primarily for public outreach. The HDTV system, developed by NHK (Japan Broadcasting