New astrometric positions of the Jovian irregular satellites Elara and Pasiphae in 2016–2018

New astrometric positions of the Jovian irregular satellites Elara and Pasiphae in 2016–2018
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2016 年至 2018 年木星不规则卫星 Elara 和 Pasiphae 的新天体测量位置

DOI:
10.1016/j.icarus.2019.113445
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发表时间:
2020-02
期刊:
影响因子:
3.2
通讯作者:
Z.G. Lan
Z.G. Lan
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
D. Yan;R.C. Qiao;Y. Yu;X. Cheng;H. Y. Zhang;X.J.Xi;K. Tang;Z.G. Lan

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云南天文台1 m望远镜在2016年、2017年和2018年连续三次对日期间,获得了木星不规则卫星Elara和pasphae的372个天文测量位置。基于Gaia DR2星表,收集到埃拉拉星196个新位置和帕西法厄星176个新位置。我们用Emelyanov模式卫星星历和DE431行星星历与IMCCE星历在线服务检索的理论位置进行了比较。对于Elara,在各个方向上,平均值(单键dc)优于−0.004 arcsec,色散不大于0.063 arcsec。对于pasphae,在各个方向上,平均值(单键dc)优于−0.045 arcsec,色散不大于0.082 arcsec。我们的新观测值比以前的观测值有更小的离散度。此外,我们还比较了每颗卫星最近的两个轨道模型以及三种不同的木星行星星历表。这些比较表明,这三种行星星历表之间的差异很小。
A total of 372 astrometric positions of Jovian irregular satellites Elara and Pasiphae were obtained during three successive oppositions in 2016, 2017, and 2018, by 1 m telescope at Yunnan Observatory. Based on Gaia DR2 catalogue, 196 new positions of Elara and 176 new positions of Pasiphae were collected. We compared our observations to the theoretical positions retrieved from IMCCE ephemeris online service with satellite ephemeris of Emelyanov model and planetary ephemeris DE431. For Elara, in each direction, the mean (Osingle bondC) is better than −0.004 arcsec and the dispersion is no more than 0.063 arcsec. For Pasiphae, in each direction, the mean (Osingle bondC) is better than −0.045 arcsec and the dispersion is no more than 0.082 arcsec. Our new observations have a smaller dispersion than previous observations. Moreover, we also compared two recent orbit models of each satellite as well as three different planetary ephemerides of Jupiter. These comparisons show that the differences among all the three planetary ephemerides are small.
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