Precise CCD positions of Triton in 2014–2016 using the newest Gaia DR1 star catalogue
Precise CCD positions of Triton in 2014–2016 using the newest Gaia DR1 star catalogue
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DOI：
10.1093/mnras/stx550
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发表时间：
2017-03
影响因子：
4.8
通讯作者：
N. Wang;Q. Peng;H. W. Peng;H. Xie;S. Ma;Q. Zhang
中科院分区：
文献类型：
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作者：
N. Wang;Q. Peng;H. W. Peng;H. Xie;S. Ma;Q. Zhang
为了得到海王星的第一颗卫星海王星的精确位置，2014-2016年间新的755次CCD观测已经减少。这些观测是由云南天文台的1米望远镜进行的，历时15个晚上。Triton的位置是相对于Gaia DR1星表中的恒星进行测量的。海王星的理论位置是从喷气推进实验室(JPL)地平线系统(包括卫星星历nep081xl)获得的，而海王星的位置是从JPL星历DE431mx获得的。结果表明，赤经和赤纬的(O-C)S的平均值分别为0.042和-0.006角秒。我们的观测结果在每个方向上的色散估计约为0.012角秒。
755 new 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. The positions of Triton are measured with respect to the stars in Gaia DR1 star catalogue. The theoretical position of Triton was retrieved from the Jet Propulsion Laboratory (JPL) Horizons System that includes the satellite ephemeris nep081xl, while the position of Neptune was obtained from the JPL ephemeris DE431mx. Our results show that the mean (O - C)s (observed minus computed) are 0.042 and -0.006 arcsec in right ascension and declination, respectively. The dispersions of our observations are estimated at about 0.012 arcsec in each direction.