The Rotation and Other Properties of Comet 49P/Arend–Rigaux, 1984–2012
The Rotation and Other Properties of Comet 49P/Arend–Rigaux, 1984–2012
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彗星 49P/Arend-Rigaux 的自转和其他特性，1984-2012
DOI：
10.3847/1538-3881/aa8b0b
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
D. Schleicher
中科院分区：
文献类型：
--
作者：
N. Eisner;M. Knight;D. Schleicher
我们分析了彗星49 P/Arend-Rigaux在2012年1月至5月期间的33个夜晚的图像，并获得了核的R波段光变曲线。通过对数据的常规定相，我们发现了一个双峰的光变曲线，其会合自转周期为13.450 ± 0.005小时。同样，相位色散最小化和Lomb-Scargle方法都显示了13.452小时的自转周期。在整个2011/2012年的显灵中，自转周期被发现增加了一个小的量，与细胞核的逆行旋转相吻合我们还用同样的方法重新分析了1984/1985年的公开资料，发现自转周期为13.45 ± 0.01小时，据此我们证明了自转周期的变化小于14秒。此外，即使观测的几何形状不同，这两个幻影的光变曲线的幅度也是相当的，误差在合理的范围内，这意味着我们在类似的地球纬度下看到彗星。我们在2012年3月发现了一个短期的类似喷气式飞机的特征，这似乎是由3月15日的一次短时间爆发活动造成的。生产率在2004/2005年，沿着与重新分析以前的结果从1984/1985年，意味着一个强大的季节性影响和一个非常陡峭的下降后近日点。这反过来又意味着，一个单一的源区，而不是从整个核泄漏，占主导地位的活动。
We analyzed images of comet 49P/Arend–Rigaux on 33 nights between 2012 January and May and obtained R-band lightcurves of the nucleus. Through usual phasing of the data, we found a double-peaked lightcurve having a synodic rotation period of 13.450 ± 0.005 hr. Similarly, phase dispersion minimization and the Lomb–Scargle method both revealed rotation periods of 13.452 hr. Throughout the 2011/2012 apparition, the rotation period was found to increase by a small amount, consistent with a retrograde rotation of the nucleus. We also reanalyzed the publicly available data from the 1984/1985 apparition by applying the same techniques, finding a rotation period of 13.45 ± 0.01 hr. Based on these findings, we show that the change in rotation period is less than 14 s per apparition. Furthermore, the amplitudes of the lightcurves from the two apparitions are comparable, to within reasonable errors, even though the viewing geometries differ, implying that we are seeing the comet at a similar sub-Earth latitude. We detected the presence of a short-term jet-like feature in 2012 March, which appears to have been created by a short-duration burst of activity on March 15. Production rates obtained in 2004/2005, along with reanalysis of the previous results from 1984/1985, imply a strong seasonal effect and a very steep fall-off after perihelion. This, in turn, implies that a single source region, rather than leakage from the entire nucleus, dominates activity.
影响因子：
3.2
作者：
V. Mannings;A. Boss;S. Russell
通讯作者：
V. Mannings;A. Boss;S. Russell