Computer Science – Performance
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p23c1274g&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #P23C-1274
Computer Science
Performance
[1214] Geodesy And Gravity / Geopotential Theory And Determination, [1221] Geodesy And Gravity / Lunar And Planetary Geodesy And Gravity, [5417] Planetary Sciences: Solid Surface Planets / Gravitational Fields, [6250] Planetary Sciences: Solar System Objects / Moon
Scientific paper
The Kaguya spacecraft were launched from Tanegashima Space Center on September 14, 2007. Kaguya consists of three orbiters: a main orbiter in a low-altitude (100 km) circular polar orbit, and two sub-satellites (Rstar and Vstar) in elliptical orbits. By taking tracking data between Rstar and the main orbiter while the main orbiter was over the farside of the Moon (called 4-way Doppler), Kaguya has obtained the first direct tracking data over the farside. Tracking data were further complemented by differential VLBI tracking between Rstar and Vstar and stations on Earth, with a sensitivity perpendicular to the line-of-sight, thus offering further improvement in three-dimensional positioning of the relay satellites. On February 12, 2009, Rstar crashed into the Moon because of its natural orbital evolution, finishing the opportunities for 4-way data. On June 10, the main orbiter finished its lifetime by a controlled crash into the Moon, and tracking for Vstar was ended on June 29, comprising the end of data collection from Kaguya. Here, results from incorporating all Kaguya Doppler tracking (including all collected 4-way data over the farside) are presented. Spherical harmonics expansions up to degree and order 100 have been determined, and they will be evaluated in terms of geophysical content, correlations with topography, and orbit determination performance. It is shown that unconstrained solutions can be obtained up to degree and order 70 without loss of correlations with topography. A preliminary high-resolution 150 degrees and order model for low-lunar orbit determination is also presented. Furthermore, preliminary results from the analysis of same-beam differential VLBI data are also included, showing how these data can especially help to improve orbit determination for the sub-satellites. The VLBI data will also contribute to a precise determination of the lower-degree gravity coefficients.
Goossens S. J.
Hanada Hideo
Ishihara Yasuhide
Iwata Takahiro
Kikuchi Fuyuhiko
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