UCAC5: New Proper Motions Using Gaia DR1
UCAC5: New Proper Motions Using Gaia DR1
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DOI：
10.3847/1538-3881/aa6196
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发表时间：
2017-02
期刊：
影响因子：
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通讯作者：
N. Zacharias;C. Finch;J. Frouard
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文献类型：
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作者：
N. Zacharias;C. Finch;J. Frouard
美国海军天文台CCD天文星表(UCAC)的新天体测量缩减是从第一性原理出发，使用8-11MAG范围内的TGAS恒星作为参考星表。在天体测量解决方案方面取得了显著的改进，并生成了UCAC5目录，其中列出了2001年附近的平均历元的平均位置。通过结合UCAC5和GIADR1数据，在GIAA坐标系中获得了超过1.07亿颗恒星的新自行，其典型精度为1-2 Ma yr−1(R=11-15 mag)和约5 ma yr−1(16 MAG)。大多数TGAS恒星的自身运动都比它们的GAIA数据有所改善，TGAS自身运动的精度水平被扩展到数百万颗更暗的恒星。使用星系场和河外源进行了外部比较。TGAS数据允许我们推导出UCAC x，y数据的极限精度，它明显优于1/100像素。
New astrometric reductions of the US Naval Observatory CCD Astrograph Catalog (UCAC) all-sky observations were performed from first principles using the TGAS stars in the 8–11 mag range as the reference star catalog. Significant improvements in the astrometric solutions were obtained, and the UCAC5 catalog of mean positions at a mean epoch near 2001 was generated. By combining UCAC5 with Gaia DR1 data, new proper motions were obtained for over 107 million stars on the Gaia coordinate system, with typical accuracies of 1–2 mas yr−1 (R = 11–15 mag) and about 5 mas yr−1 at 16th mag. Proper motions of most TGAS stars are improved over their Gaia data and the precision level of TGAS proper motions is extended to many millions more, fainter stars. External comparisons were made using stellar cluster fields and extragalactic sources. The TGAS data allow us to derive the limiting precision of the UCAC x, y data, which is significantly better than1/100 pixel.