Photometry of 2006 RH120: An asteroid temporary captured into a geocentric orbit

T. Kwiatkowski*, A. Kryszczyńska, M. Polińska, D. A.H. Buckley, D. O'Donoghue, P. A. Charles, L. Crause, S. Crawford, Y. Hashimoto, A. Kniazev, N. Loaring, E. Romero Colmenero, R. Sefako, M. Still, P. Vaisanen


研究成果: 雜誌貢獻期刊論文同行評審

45 引文 斯高帕斯(Scopus)


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, 2006 RH 120 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 17 March 2007 when the solar phase angle remained almost constant at 74°. The observations lasted about an hour each night and the object was exposed for 7-10 s through the "clear" filter. Results. From the lightcurves obtained on three nights we derived two solutions for a synodical period of rotation: P1 = 1.375 ± 0.001 min and P2 = 2.750 ± 0.002 min. The available data are not sufficient to choose between them. The absolute magnitude of the object was found to be H = 29.9 ± 0.3 mag (with the assumed slope parameter G = 0.25) and its effective diameter D = 2-7 m, depending on the geometric albedo pV (with the most typical near-Earth asteroids albedo pV = 0.18 its diameter would be D = 3.3 ± 0.4 m). 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.

頁(從 - 到)967-974
期刊Astronomy and Astrophysics
出版狀態已發佈 - 2009 3月 1

ASJC Scopus subject areas

  • 天文和天體物理學
  • 空間與行星科學


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