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arXiv 1107.2249astro-ph.EPastro-ph.IM
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挖掘已知近地小行星的CFHT遗产调查

Mining the CFHT Legacy Survey for known Near Earth Asteroids

O. Vaduvescu, A. Tudorica, M. Birlan, R. Toma, M. Badea, D. Dumitru, C. Opriseanu, D. Vidican

摘要:

加拿大-法国-夏威夷遗产调查(CFHTLS)包括大约25000张MegaCam图像,数据挖掘是为了寻找已知的近地小行星(NEAs)和潜在危险小行星(PHAs)的偶然相遇。在508张候选图像上共发现了143颗小行星(109颗近地小行星和34颗PHA),这些图像经过了实地校正和仔细测量,并将其天体测量报告给了小行星中心。报告了回收和预覆盖(发现前的显形),包括27颗预覆盖小行星(20颗近地小行星和7颗PHA)和116颗回收小行星(89颗近地小行星和27颗PHA)的数据。我们的数据延长了第一次或最后一次反对的41个轨道的弧,通过拟合在一个新的反对中获得的数据改进了35个轨道,在第二次反对中恢复了6个NEAs,并使我们能够改善大多数轨道及其最小轨道交叉距离(MOID),这是未来监测潜在地球撞击危险的重要参数。

英文摘要:

The Canada-France-Hawaii Legacy Survey (CFHTLS) comprising about 25 000 MegaCam images was data mined to search for serendipitous encounters of known Near Earth Asteroids (NEAs) and Potentially Hazardous Asteroids (PHAs). A total of 143 asteroids (109 NEAs and 34 PHAs) were found on 508 candidate images which were field corrected and measured carefully, and their astrometry was reported to Minor Planet Centre. Both recoveries and precoveries (apparitions before discovery) were reported, including data for 27 precovered asteroids (20 NEAs and 7 PHAs) and 116 recovered asteroids (89 NEAs and 27 PHAs). Our data prolonged arcs for 41 orbits at first or last opposition, refined 35 orbits by fitting data taken at one new opposition, recovered 6 NEAs at their second opposition and allowed us to ameliorate most orbits and their Minimal Orbital Intersection Distance (MOID), an important parameter to monitor for potential Earth impact hazard in the future.

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