Computer Science – Performance
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p31b1400g&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P31B-1400
Computer Science
Performance
1221 Lunar And Planetary Geodesy And Gravity (5417, 5450, 5714, 5744, 6019, 6250), 5417 Gravitational Fields (1221), 5430 Interiors (8147), 5450 Orbital And Rotational Dynamics (1221)
Scientific paper
On September 14, 2007, the KAGUYA (SELENE) spacecraft were launched from Tanegashima Space Center in Japan. KAGUYA consists of three satellites: a main orbiter in a 100 km by 100 km circular, polar orbit, and two small subsatellites in 100 km by 2400 km (Rstar) and 100 km by 800 km (Vstar) elliptical, polar orbits. By employing 4-way Doppler tracking between the main orbiter and Rstar, the first direct tracking data of a satellite over the far side have been obtained, resulting in a newly determined global lunar gravity field. The existing 2-way tracking data set is furthermore complemented by precise differential VLBI tracking between Rstar and Vstar, providing a sensitivity perpendicular to the line-of-sight from station to satellite. This work focuses on various aspects of processing and analysing the tracking data from the Kaguya satellites for the main purpose of lunar gravity field estimation. This includes particulars of the data processing strategies, multi-satellite analysis and data weighting. Gravity models from Kaguya data are evaluated in terms of data fit and performance in orbit determination. The performance of the differential VLBI data in the orbit determination of the small subsatellites is also discussed, as well as their contribution to the gravity solutions. Results for the polar moment of inertia C/MR2 from the degree 2 coefficients, and for the lunar k2 Love number are also included.
Goossens Sander
Hanada Hideo
Ishihara Yasuhide
Iwata Takahiro
Kikuchi Fuyuhiko
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