Apollo asteroid 2005 UD : split nucleus of (3200) Phaethon?
Apollo asteroid 2005 UD : split nucleus of (3200) Phaethon?
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DOI：
10.1051/0004-6361:200600022
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发表时间：
2006-05
影响因子：
6.5
通讯作者：
K. Ohtsuka;T. Sekiguchi;D. Kinoshita;J. Watanabe;Takashi Ito;H. Arakida;T. Kasuga
中科院分区：
文献类型：
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作者：
K. Ohtsuka;T. Sekiguchi;D. Kinoshita;J. Watanabe;Takashi Ito;H. Arakida;T. Kasuga
上下文。最近发现的阿波罗小行星2005 UD最有可能是法厄同-双子座流复合体（PGC）的一个大成员。目标。探测到像这样更复杂的成员应该能澄清PGC的形成和演化。方法。我们对Kustaanheimo-Stiefel正则化运动方程的前后（±$ 10,000 $-yr）积分显示，阿波罗小行星（3200）Phaethon和2005 UD的轨道演化显示出类似的轮廓，时移约4600年。在PGC中，这种时移相对于法厄同-双子座的220年和法厄同-六分星之间的3900年的时差相当大，尽管比法厄同-犬神小星之间的19000美元年要小得多。结论。这是一个千米级的天体，因此可能是法厄同的分裂核。此外，2005 UD和六分座流星雨的轨道参数在100年的时滞上符合得很好。因此，六分座流星雨与2005 UD的关系似乎比法厄同更密切。
Context. The recently discovered Apollo asteroid 2005 UD is the most likely candidate for being a large member of the Phaethon-Geminid stream Complex (PGC). Aims. Detecting more complex members like this should clarify the formation and evolution of the PGC. Methods. Our backward and forward ( ± $10\,000$-yr) integration of the Kustaanheimo-Stiefel regularized equation of motion revealed that the orbital evolutions of Apollo asteroids (3200) Phaethon and 2005 UD show a similar profile, time-shifting by ~4600 yr. Results. Within the PGC, this time shift is rather large against the time-lag of 220 yr for Phaethon-Geminids and ~3900 yr between Phaethon-Sextantids, although much smaller than that of ~$19\,000$ yr between Phaethon-Canis Minorids. Conclusions. This is a km-order object, hence may be a split nucleus of Phaethon. Besides, the orbital parameters of 2005 UD and the Sextantids are in good agreement along with the time-lag of 100 yr. Therefore, the Sextantid meteor shower seems to be associated more closely with 2005 UD than Phaethon.