arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1809.09157astro-ph.IM
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ATLAS全天恒星参考星表

The ATLAS All-Sky Stellar Reference Catalog

J. L. Tonry, L. Denneau, H. Flewelling, A. N. Heinze, C. A. Onken, S. J. Smartt, B. Stalder, H. J. Weiland, C. Wolf

摘要:

小行星撞击地球最后警报系统(ATLAS)每天晚上观察大部分天空,寻找危险的小行星。它的数据也用于搜索光度变化,其中对变化的敏感性受到光度精度的限制。由于每个曝光角到角跨越7.6度,超过0.01 mag的大气透明度变化是常见的,并且0.01 mag测光不能通过使用恒定的平场校准图像来实现。因此,我们已经收集了一个全天空的参考目录约10亿颗恒星,以m~19从各种来源,以校准每个曝光的天体测量和测光。盖亚DR 2是ATLAS Refcat 2的天体测量来源。g,r,i,z测光的来源包括Pan-STARRS DR 1、ATLAS Pathfinder测光计划、ATLAS重新展平的APASS数据、SkyMapper DR 1、APASS DR 9、Tycho-2星表和Yale Bright Star Catalog。我们试图使这个目录至少99%完整到m<19,包括天空中最亮的恒星。我们相信,系统误差不大于5毫等RMS,虽然误差是大到20毫等的小补丁附近的银道。

英文摘要:

The Asteroid Terrestrial-impact Last Alert System (ATLAS) observes most of the sky every night in search of dangerous asteroids. Its data are also used to search for photometric variability, where sensitivity to variability is limited by photometric accuracy. Since each exposure spans 7.6 deg corner to corner, variations in atmospheric transparency in excess of 0.01 mag are common, and 0.01 mag photometry cannot be achieved by using a constant flat field calibration image. We therefore have assembled an all-sky reference catalog of approximately one billion stars to m~19 from a variety of sources to calibrate each exposure's astrometry and photometry. Gaia DR2 is the source of astrometry for this ATLAS Refcat2. The sources of g, r, i, z photometry include Pan-STARRS DR1, the ATLAS Pathfinder photometry project, ATLAS re-flattened APASS data, SkyMapper DR1, APASS DR9, the Tycho-2 catalog, and the Yale Bright Star Catalog. We have attempted to make this catalog at least 99% complete to m<19, including the brightest stars in the sky. We believe that the systematic errors are no larger than 5 millimag RMS, although errors are as large as 20 millimag in small patches near the galactic plane.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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