Rotations and densities of trans-Neptunian objects
Rotations and densities of trans-Neptunian objects
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DOI：
10.1051/0004-6361/200911970
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发表时间：
2009-12
影响因子：
6.5
通讯作者：
D. Perna;E. Dotto;M. Barucci;A. Rossi;S. Fornasier;C. Bergh
中科院分区：
文献类型：
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作者：
D. Perna;E. Dotto;M. Barucci;A. Rossi;S. Fornasier;C. Bergh
上下文海王星外天体（TNO）代表了我们太阳系研究的新前沿。特别是对它们转动性质的研究，可以为它们的内部结构和碰撞演化提供重要的线索。我们扩大了有限的样本TNO已知的旋转速率，并提高这些机构的物理性质的知识。利用欧洲南方天文台的新技术望远镜对5颗TNO（144897 2004 UX 10，145451 2005 RM 43，145453 2005 RR 43，2003 UZ 117和2003 UZ 413）进行了测光观测。我们确定了四个目标的自旋速率，而2003年UZ 117的周期只有一个估计是可能的。根据计算得到的四个TNO的自转周期和光变曲线振幅，我们导出了它们的轴比下限，从而估算了它们的密度。结合我们的新结果和文献数据，我们研究了外太阳系小天体的密度统计。
Context. Trans-Neptunian objects (TNOs) represent a new frontier in the study of our Solar System. In particular, the investigation of their rotational properties can provide important hints about their internal structure and collisional evolution.Aims. We expand the limited sample of TNOs with known rotation rates, and improve the knowledge of the physical nature of these bodies.Methods. We carried out photometric observations of 5 TNOs (144897 2004 UX10 , 145451 2005 RM43 , 145453 2005 RR43 , 2003 UZ117 , and 2003 UZ413 ) using the New Technology Telescope of the European Southern Observatory.Results. We determined the spin rates of four targets, while only an estimation of the period was possible for 2003 UZ117 .Conclusions. From the computed rotational periods and the obtained light curve amplitudes of four TNOs, we derived the lower limit to their axis ratio , and hence estimated their density. Combining our new results with literature data, we investigated the density statistics of the small bodies of the outer Solar System.