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首页> 外文期刊>Astronomy and astrophysics >Photometry of 2006?RH$_{120}$: an asteroid temporary captured into?a?geocentric orbit
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Photometry of 2006?RH$_{120}$: an asteroid temporary captured into?a?geocentric orbit

机译：2006？RH $ _ {120} $的测光法：暂时被捕获到地心轨道的小行星

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Aims. From July 2006 to July 2007 a very small asteroid orbited the Earth within its Hill sphere. We used this opportunity to study its rotation and estimate its diameter and shape. Methods. Due to its faintness, 2006RH120 was observed photometrically with the new 10-m SALT telescope at the SAAO (South Africa). We obtained data on four nights: 11, 15, 16, and 17March2007 when the solar phase angle remained almost constant at .The observations lasted about an hour each night and the object was exposed for 7-10s through the ``clear'' filter. Results. From the lightcurves obtained on three nights we derived two solutions for a synodical period of rotation: min and min. The available data are not sufficient to choose between them. The absolute magnitude of the object was found to be mag (with the assumed slope parameter G=0.25) and its effective diameter ,depending on the geometric albedo pV (with the most typical near-Earth asteroids albedo pV=0.18 its diameter would be ). The body has an elongated shape with the a/b ratio greater than 1.4. It probably originates in low-eccentricity Amor or Apollo orbits. There is still a possibility, which needs further investigation, that it is a typical near-Earth asteroid that survived the aerobraking in the Earth's atmosphere and returned to a heliocentric orbit similar to that of the Earth. Key words: techniques: photometric - minor planets, asteroids
机译：目的从2006年7月到2007年7月，一个很小的小行星在其地球范围内的地球上运行。我们利用这个机会研究了它的旋转并估计了它的直径和形状。方法。由于其微弱，在南非SAAO用新型10米SALT望远镜进行了光度法观察，观​​察到了2006RH120。我们获得了四个夜晚的数据：2007年3月11日，15日，16日和17日，太阳相位角几乎保持恒定，观察持续约一个小时，并且该物体通过``透明''滤镜曝光了7-10秒。 。结果。从三晚获得的光曲线中，我们得出了一个旋转周期的两个解：min和min。可用数据不足以在它们之间进行选择。发现该物体的绝对大小为mag（假设斜率参数G = 0.25），并且其有效直径取决于几何反照率pV（最典型的近地小行星反照率pV = 0.18时，其直径为）。 。主体具有a / b比率大于1.4的细长形状。它可能起源于低偏心率的Amor或Apollo轨道。还有一种可能性，有待进一步研究，它是典型的近地小行星，它在地球大气层的航空制动中幸存下来，并返回了与地球类似的日心轨道。关键词：技术：光度学-小行星，小行星

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