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arXiv 1408.3302astro-ph.IM
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太阳系与小视场天体测量

Solar system and small-field astrometry

Erik Høg, George Kaplan

摘要:

讨论了太阳系研究中的天体测量问题。概述提供了参考资料,涵盖了天体测量重要的太阳系的所有方面:行星、卫星、小行星和近地天体的轨道、小行星的质量、小行星和KBO的掩星以及小行星和KBO家族。从地面,从盖亚和从盖亚继承者天体测量的作用进行了讨论,但不是从空间的小领域天体测量。从在旗杆1.55米天体测量反射器上使用CCD相机的工作中可以看出,当使用普通望远镜(即没有波前校正器)和视场尺寸大于2弧分时,在一个晚上的观测中,1 mas的精度是最好的。人们已经看到,同样的精度可以达到更大的4米级望远镜在夏威夷,虽然它不是专门设计用于天体测量。从地面测量1质量标准的精度主要是指不移动的点源,但如果考虑到相位效应,预计从许多夜晚的观测中,太阳系天体从地面测量可以达到1质量标准。

英文摘要:

Astrometric issues for solar system studies are discussed. An overview gives references and cover all aspects of the solar system where astrometry is important: orbits of planets, moons, asteroids and NEOs, masses of asteroids, occultations of asteroids and KBOs, and families of asteroids and KBOs. The roles of astrometry from the ground, from Gaia and from a Gaia successor are discussed, but not small-field astrometry from space. It appears from work with CCD cameras at the 1.55 m astrometric reflector in Flagstaff that an accuracy of 1 mas is the best possible from the ground during one night observing when using ordinary telescopes, i.e. without wave-front correctors, and for field sizes larger than 2 arcmin. It has been seen that the same accuracies can be reached with the much larger 4-m class telescope on Hawaii although it is not specifically designed for astrometry. The accuracy of 1 mas from the ground refers mainly to non-moving point sources, but it is expected that 1 mas can be reached from the ground for solar system bodies from many nights of observations when phase effects are taken into account.

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