(121514) 1999 UJ 7 : A primitive, slow-rotating Martian Trojan
(121514) 1999 UJ 7 : A primitive, slow-rotating Martian Trojan
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(121514) 1999 UJ 7：一种原始的、缓慢旋转的火星特洛伊木马
DOI：
10.1051/0004-6361/201732466
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发表时间：
2018
影响因子：
6.5
通讯作者：
Borisov G
中科院分区：
文献类型：
--
作者：
Borisov G
AimsThe的目的，这项调查是确定的起源和表面组成的小行星（121514）1999 UJ 7，目前已知的L4火星Trojan astero.MethodsWe已经获得了可见光反射光谱和光度学的1999 UJ 7和比较光谱的结果与光谱的一些分类类和子类。A光变曲线得到和分析，以确定小行星的自旋state.ResultsThe可见光谱的1999 UJ 7表现出负斜率的蓝色区域和存在的广泛和深的吸收功能中心约0.65μm。光谱的整体形态似乎表明C-复合物分类。光度学行为相当复杂。光变曲线显示主周期为1.936 d，但这是仅使用光度数据的子集导出的。小行星可能是在一个非主轴旋转状态，但我们的观测范围是不够的，以得出明确的conclusionsAlthough观测到的光谱吸收是更广泛和更深，这一发现可能是兼容的0.7μm的光谱特征所表现出的一些CH-型小行星，并可能被解释为诊断的水合矿物的存在。1999 UJ 7作为一个原始天体的推断成分可能与一个富含挥发物的天体相一致，该天体最初是在太阳系雪线之外吸积的，随后演化到太阳系的内部区域。
AimsThe goal of this investigation is to determine the origin and surface composition of the asteroid (121514) 1999 UJ7, the only currently known L4Martian Trojan asteroid.MethodsWe have obtained visible reflectance spectra and photometry of 1999 UJ7and compared the spectroscopic results with the spectra of a number of taxonomic classes and subclasses. A light curve was obtained and analysed to determine the asteroid spin state.ResultsThe visible spectrum of 1999 UJ7exhibits a negative slope in the blue region and the presence of a wide and deep absorption feature centred around ~0.65μm. The overall morphology of the spectrum seems to suggest a C-complex taxonomy. The photometric behaviour is fairly complex. The light curve shows a primary period of 1.936 d, but this is derived using only a subset of the photometric data. The asteroid may be in a non-principal axis rotational state, but our observational coverage is insufficient to draw definitive conclusions.ConclusionsAlthough the observed spectral absorption is wider and deeper, this finding may be compatible with the 0.7μm spectral feature exhibited by some Ch-type asteroids and could possibly be interpreted as diagnostic of the presence of hydrated minerals. The inferred composition of 1999 UJ7as a primitive object can be consistent with a volatile-rich object originally accreted beyond the snow line of the solar system, and subsequently evolved to reach the inner regions of the solar system.