Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995acasn..36...93f&link_type=abstract
Acta Astron. Sin., Vol. 36, No. 1, p. 93 - 100
Astronomy and Astrophysics
Astronomy
Lunar Occultations: Point Sources, Planetary Occultations: Point Sources
Scientific paper
Starting with the numerical ephemeris of the celestial bodies in the solar system, DE200/LE200, constructed by JPL, and the routines for the correction of precession and nutation, provided by the USNO, this paper proposes a method of predicting occultations of point sources (star or radio source) by planets and the Moon. First, a necessary condition for the occulted sources by a specified body and in a given period is presented. The second step is to predict the global circumstances: the beginning and the ending instants, the precise boundary of a region on the surface of the spheroid of the Earth in which the occultation is observable. The authors have discovered that there exists a set of north-south rise-set boundary points where the shadowed source rises and sets at the same time. As far as the authors know, it has never been described before. The final step is to predict the local information of an occultation at an observational site.
Fu Yanning
He Yunan
Huang Tianyi
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