摘要
A new orbit of Triton was provided by our previous work, benefitted by new Gaia Data, both in a new precise reduction of charge-coupled device observations and in the planetary ephemeris INPOP19 a.In this paper, we provide a new ephemeris for another main Neptunian satellite, Nereid. The orbit is fitted for the newest observations, including 2 075 ground-based observations during the period 1949-2018 and 83 space observations acquired by the Voyager 2 spacecraft in 1989. The dynamical model used here is consistent with that of our previous work. For the ground-based absolute observations of Nereid, the rootmean-square deviations are 0.201′′in right ascension and 0.189′′in declination. Finally, a comparison with the HORIZONS ephemeris is made and discussed.
作者
Kai Tang
Hui-Yan Zhang
Yong Yu
Dan Yan
Yin-Dun Mao
唐凯;张会彦;于涌;严丹;毛银盾(Key Laboratory of Planetary Sciences,Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;School of Mathematics Physics and Statistics,Shanghai University of Engineering Science,Shanghai 201620,China;Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China;School of Physics and Electronic Information,Huanggang Normal University,Huanggang 438000,China)
基金
funded by the B-type Strategic Priority Program of the Chinese Academy of Sciences(Grant No.XDB41000000)
the National Natural Science Foundation of China(NSFC)under Nos.12073062 and 11803019
the Preresearch Project on Civil Aerospace Technologies funded by the China National Space Administration(Grant No.D020303)。
