Detailed Analysis of the Asteroid Pair (6070) Rheinland and (54827) 2001 NQ8
Detailed Analysis of the Asteroid Pair (6070) Rheinland and (54827) 2001 NQ8
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小行星对 (6070) Rheinland 和 (54827) 2001 NQ8 的详细分析
DOI：
10.3847/1538-3881/aa72ea
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
C. Colazo
中科院分区：
文献类型：
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作者：
D. Vokrouhlický;P. Pravec;J. Ďurech;K. Hornoch;P. Kušnirák;A. Galád;J. Vraštil;H. Kučáková;J. Pollock;J. Ortiz;N. Morales;N. Gaftonyuk;D. Pray;Y. Krugly;R. Inasaridze;V. Ayvazian;I. Molotov;C. Colazo
小行星对的存在，两个天体在类似的日心轨道上，揭示了小行星之间正在进行的旋转裂变过程。这类新发现的天体尚未被详细研究。在这里，我们选择了小行星（6070）Rheinland和（54827）2001 NQ8，这是最适合进行深入分析的一对。首先，我们使用现有的光学光度学来确定它们的旋转状态和凸形状。莱茵的旋转极非常靠近黄道南极，纬度不确定度约为10°。2001年NQ8的极点有两个等价的解：（72°，−49°）或（242°，−46°）（黄道经度和纬度）。在这两种情况下，经度值的不确定性约为10°，纬度值的不确定性约为15°（两种不确定性）。2001年NQ8的恒星自转周期为5.877186 ± 0.000002小时。其次，我们构造了一个精确的数值积分器，以确定其过去的状态矢量，即它们的日心位置和速度，以及它们的自旋矢量的方向。使用这个新工具，我们调查的起源（6070）莱茵兰和（54827）2001 NQ8对。我们得到一个16.34 ± 0.04 kyr的形式年龄解。这包括了小行星带中质量最大的天体（谷神星、智神星和灶神星）的影响，但其他小行星的重力扰动可能意味着实际年龄的不确定性略大于其正式值。分析结果，从我们的数值模拟到250千亚，我们反对的可能性，这对将允许一个更大的年龄。这两颗小行星在分离时的初始自旋矢量并不共线，而是倾斜了。
The existence of asteroid pairs, two bodies on similar heliocentric orbits, reveals an ongoing process of rotational fission among asteroids. This newly found class of objects has not been studied in detail yet. Here we choose asteroids (6070) Rheinland and (54827) 2001 NQ8, the most suitable pair for an in-depth analysis. First, we use available optical photometry to determine their rotational state and convex shapes. Rotational pole of Rheinland is very near the south ecliptic pole with a latitude uncertainty of about 10°. There are two equivalent solutions for the pole of 2001 NQ8, either (72°, −49°) or (242°, −46°) (ecliptic longitude and latitude). In both cases, the longitude values have about 10° uncertainty and the latitude values have about 15° uncertainty (both uncertainties). The sidereal rotation period of 2001 NQ8 is 5.877186 ± 0.000002 hr. Second, we construct a precise numerical integrator to determine the past state vectors of the pair’s components, namely their heliocentric positions and velocities, and orientation of their spin vectors. Using this new tool, we investigate the origin of the (6070) Rheinland and (54827) 2001 NQ8 pair. We find a formal age solution of 16.34 ± 0.04 kyr. This includes effects of the most massive objects in the asteroid belt (Ceres, Pallas, and Vesta), but the unaccounted gravitational perturbations from other asteroids may imply that the realistic age uncertainty is slightly larger than its formal value. Analyzing results from our numerical simulation to 250 kya, we argue against a possibility that this pair would allow an older age. Initial spin vectors of the two asteroids, at the moment of their separation, were not collinear, but tilted by .