Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....112.1312y&link_type=abstract
Astronomical Journal v.112, p.1312
Astronomy and Astrophysics
Astronomy
16
Astrometry
Scientific paper
In this paper, new sophisticated computing formulas for astronomical refraction have been developed based on the generator function method of atmospheric refractive integrals proposed by Yan & Ping (1995, AJ, 110, 934). The accuracies of the expressions have been numerically improved about one order of magnitude in comparison with those commonly used. A significant advantage of using a calibrated continued fraction mapping function for the astronomical refraction correction is to extend the coverage of the formulas to rather lower elevation observations with high accuracy. The corrections related to the finite distances of objects have been considered in detail. We have briefly analyzed the influences of the errors of atmospheric profile and of the deviation of atmospheric parameters. in order to match different requirements in astrometry and geodesy, we have considered the corrections at both radio and optical frequencies, respectively. The dispersion of signals at optical frequencies plays a primary role in astronomical refraction computation.
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