Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cemda..74..243r&link_type=abstract
Celestial Mechanics and Dynamical Astronomy, v. 74, Issue 4, p. 243-252 (1999).
Astronomy and Astrophysics
Astronomy
2
Nutation, (Sub)Diurnal Period, Torque, Rigid Earth, Geopotential
Scientific paper
In this paper, the series RDAN97 recently published (Roosbeek and Dehant, 1998) is completed by computing the diurnal and subdiurnal nutation terms. The method used is based on computing the torque induced by the external bodies on the rigid earth. The ephemerides used are analytical and based on celestial mechanics considerations. With a truncation level of 0.1 μas, 115 terms in longitude and 78 terms in obliquity have been computed. These terms correspond to the influence of the earth's geopotential coefficients c2,2 and s2,2, c3,m and s3,m (for the interaction between the earth and the moon and the sun), and c4,m and s4,m (for the interaction between the earth and the moon). A comparison with the recent theories REN-2000 (Souchay and Kinoshita, 1996, 1997) and SMART97 (Bretagnon et al., 1997, 1998) shows that our series is at a very high precision, better than the most recent VLBI campaigns.
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