Astrometric Reduction of Cassini ISS Images of Enceladus in 2015 Based on Gaia DR1

Q F Zhang,V Lainey,N J Cooper,A Vienne,Q Y Peng,N Wang

doi:10.1017/s1743921317005555

Astrometric Reduction of Cassini ISS Images of Enceladus in 2015 Based on Gaia DR1

Q F Zhang, V Lainey + Show 4 more

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https://doi.org/10.1017/s1743921317005555

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Journal: Proceedings of the International Astronomical Union. International Astronomical Union

Publication Date: Apr 1, 2017

Affiliation: Jinan University, Paris Observatory, Institut de Mécanique Céleste et de Calcul des Éphémérides, University of Lille, Sorbonne Université, French National Centre for Scientific Research

#International Celestial Reference Frame #Reference Ones + Show 8 more

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Abstract

AbstractThe Gaia DR1 catalogue stars are taken as reference ones to reduce the Cassini ISS images of Enceladus in 2015, and a total of 494 Cassini-centered astrometric observation are obtained in right ascension(α) and declination (δ) in the international Celestial Reference Frame(ICRF). Compared with JPL ephemerides SAT367, we derive that their mean residuals are a few tens meters in α*cos(δ) and a few kilometers in δ, and their standard deviation is not over 2 kilometers. Compared with the results from UCAC4 catalogue stars, The Gaia DR1 has the equivalent precision of reduction.

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