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矮行星谷神星两次多弦掩星的结果(1)

Results of two multi-chord stellar occultations by dwarf planet (1) Ceres

A. R. Gomes-Júnior, B. L. Giacchini, F. Braga-Ribas, M. Assafin, R. Vieira-Martins, J. I. B. Camargo, B. Sicardy, B. Timerson, T. George, J. Broughton, T. Blank… 展开作者

A. R. Gomes-Júnior, B. L. Giacchini, F. Braga-Ribas, M. Assafin, R. Vieira-Martins, J. I. B. Camargo, B. Sicardy, B. Timerson, T. George, J. Broughton, T. Blank, G. Benedetti-Rossi, J. Brooks, R. F. Dantowitz, D. W. Dunham, J. B. Dunham, C. K. Ellington, M. Emilio, F. R. Herpich, C. Jacques, P. D. Maley, L. Mehret, A. J. T. Mello, A. C. Milone, E. Pimentel, W. Schoenell, N. S. Weber

摘要:

我们报告了矮行星(1)谷神星的两个多弦恒星掩星的结果,分别于2010年8月17日从巴西和2013年10月25日从美国观测到。在2010年的掩星观测中获得了4个阳性探测,在2013年的掩星观测中获得了9个阳性探测。椭圆模型被调整到观察到的弦,以获得谷神星的大小和形状。两个肢体拟合解决方案进行了研究,为每个事件。第一种是具有不确定极方位角的标称解。第二个是由Drummond等人给出的极坐标的约束。假设一个麦克劳林椭球体,我们确定的赤道直径为972 $\pm$ 6公里和一个明显的扁率为0.08 $\pm$ 0.03作为我们的最佳解决方案。这些结果与迄今为止对谷神星的所有可用尺寸和形状的确定进行了比较,并将由美国宇航局的黎明号太空任务确认。

英文摘要:

We report the results of two multi-chord stellar occultations by the dwarf planet (1) Ceres that were observed from Brazil on 2010 August 17, and from the USA on 2013 October 25. Four positive detections were obtained for the 2010 occultation, and nine for the 2013 occultation. Elliptical models were adjusted to the observed chords to obtain Ceres' size and shape. Two limb fitting solutions were studied for each event. The first one is a nominal solution with an indeterminate polar aspect angle. The second one was constrained by the pole coordinates as given by Drummond et al. Assuming a Maclaurin spheroid, we determine an equatorial diameter of 972 $\pm$ 6 km and an apparent oblateness of 0.08 $\pm$ 0.03 as our best solution. These results are compared to all available size and shape determinations for Ceres made so far, and shall be confirmed by the NASA's Dawn space mission.

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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