Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009acasn..50..197l&link_type=abstract
Acta Astronomica Sinica, vol. 50, no. 2, p.197-205
Astronomy and Astrophysics
Astronomy
Astrometry: Laser Ranging, Minor Planets, Astroids: Individual, Relativity
Scientific paper
The asteroid Icarus laser ranging mission includes to place a set of laser reflector, timer onto Icarus and to range between the Icarus and the Earth ground stations, which will precisely measure PPN parameters γ and β , the solar quadruple moment J2, the temporal variation of the gravitational constant Ä / G , and the barycentric constants of the solar-system bodies. With the advances in laser technology, a timing accuracy of 10 picoseconds (3mm in terms of ranging) can be realized. The Icarus will approach to Earth in the year 2015, which provides a good launch window for an Icarus lander. There is a simulation of the laser ranging between the ground station and the Icarus for a period of 800 days starting from September 25, 2015 by using PMOE 2003 planetary ephemeris framework, and obtained the uncertainties of 18 parameters after making a fit of them with Kalman filter method. From this simulation, the uncertainties for γ, β, J2 and Gdot / G are determined to be 7.8 × 10-8, 9.0× 10-7, 9.8×10-11 and 7.0×10-15yr-1 respectively, which are 1-3 orders of magnitude more accurate than the results from the empirical experiments to date. The result of this simulation also makes much sense for the test of relativity, the measurement of the solar-system fundamental parameters, and the test of fundamental laws of space and time.
li Yong Gang
Luo Yong-Jie
Xia Yong
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