Global Lunar Gravity Mapping Using SELENE Sub-Satellites

Details Global Lunar Gravity Mapping Using SELENE Sub-Satellites Global Lunar Gravity Mapping Using SELENE Sub-Satellites

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mbns.conf...28i&link_type=abstract

The Moon Beyond 2002: Next Steps in Lunar Science and Exploration, p. 28

Astronomy and Astrophysics

Astronomy

Lunar Gravitation, Orbit Perturbation, Models, Remote Sensing, Radio Telescopes

Scientific paper

The spatial distributions of the lunar gravity field have been investigated from the orbit perturbations which had been observed by two-way range and range rate (RARR) measurements for the spacecrafts in lunar orbits. The orbital determination data till Lunar Prospector have produced and improved the models of the lunar gravity field. The gravity data above the lunar far side were, however, less accurate than those above the near side, because they were observed from higher orbits or estimated from the near side data which were affected with accumulated acceleration by the far side gravity. SELENE is under development by National Space Development Agency of Japan (NASDA) and Institute of Space and Astronautical Science (ISAS), and will be launched in 2005 to elucidate lunar origin and evolution. SELENE is composed of Main Orbiter, and two micro sub-satellites; the Relay Satellite (Rstar) and the VLBI Radio Satellite (Vstar) which will be used for selenodesy experiments. Rstar and Vstar will be injected into the initial elliptical orbit of 2,400-100 km and 800-100 km in altitude, respectively. Main Orbiter will be controlled to keep the circular orbit of 100 km in altitude. These satellites will be used to obtain selenodetic data of higher accuracy by four-way Doppler measurements and differential VLBI observations.

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