Characterization of the precision premium in astrometry
Characterization of the precision premium in astrometry
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DOI：
10.1093/mnras/stz2871
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发表时间：
2019-10
影响因子：
4.8
通讯作者：
F. R. Lin;J. Peng;Z. J. Zheng;Q. Peng
中科院分区：
文献类型：
--
作者：
F. R. Lin;J. Peng;Z. J. Zheng;Q. Peng
精确溢价是天体测量学中的一个概念，由Pascu在1994年首次提出，最初意味着当木星的伽利略卫星的距离很小时，它们的相对位置测量将更加准确。相应地，自伽利略卫星问世以来，人们对它进行了大量的观测。然而，精度溢价生效的确切间隔范围尚不清楚，也不清楚精度随间隔的变化。本文利用疏散星团M35的观测资料研究了该方法的精度问题，并利用最新的星星表Gaia DR 2进行了数据处理。我们的研究结果表明，精度溢价适用于小于100弧秒的两个特定的对象和相对位置精度可以很好地拟合的S形函数。天王星卫星的观测也减少了，作为精确度溢价的一个例子。
The precision premium, a concept in astrometry that was first presented by Pascu in 1994, initially means that the relative positional measurement of the Galilean satellites of Jupiter will be more accurate when their separations are small. Correspondingly, many observations have been obtained of these Galilean satellites since it was introduced. However, the exact range of separations at which the precision premium takes effect is not clear yet, nor the variation of the precision with separation. In this article, observations of open cluster M35 are used to study the precision premium and the newest star catalogue Gaia DR2 is used in data reduction. Our results show that the precision premium applies at less than 100 arcsec for two specific objects and the relative positional precision can be well fitted by a sigmoidal function. Observations of Uranian satellites are also reduced as an example of the precision premium.