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Precise CCD positions of Triton in 2014-2016 from the Gaia DR1

Published online by Cambridge University Press:  07 March 2018

N. Wang ,
Q. Y. Peng ,
H. W. Peng  and
Q. F. Zhang
N. Wang
Affiliation:
Department of Computer Science, Jinan University, Guangzhou 510632, China, email: [email protected]
Q. Y. Peng
Affiliation:
Department of Computer Science, Jinan University, Guangzhou 510632, China, email: [email protected]
H. W. Peng
Affiliation:
Department of Computer Science, Jinan University, Guangzhou 510632, China, email: [email protected] Yunnan Observatory, CAS, Kunming 650216, China
Q. F. Zhang
Affiliation:
Department of Computer Science, Jinan University, Guangzhou 510632, China, email: [email protected]
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Abstract

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755 CCD observations during the years 2014-2016 have been reduced to derive the precise positions of Triton, the first satellite of Neptune. The observations were made by the 1 m telescope at Yunnan Observatory over 15 nights during the years 2014-2016. The theoretical position of Triton was retrieved from the Jet Propulsion Laboratory Horizons system. Our results show that when the newest Gaia catalogue (Gaia DR1) is referred to the mean O-Cs (observed minus computed) residuals are about 0.042 and -0.006 arcsec, the dispersions are 0.012 and 0.012 arcsec in right ascension and declination, respectively. The dispersions are improved very significantly when the Gaia DR1 is referred to. However, the agreement in right ascension is not so good as that in declination, the reason might come from the uncertainty of planet ephemeris. More observations are needed to confirm this.

Keywords

methods: observationaltechniques: image processingastrometry
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 409 - 410
Copyright
Copyright © International Astronomical Union 2018 

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