Imaging Borrelly

被引:53
作者
Soderblom, LA
Boice, DC
Britt, DT
Brown, RH
Buratti, BJ
Kirk, RL
Lee, M
Nelson, RM
Oberst, J
Sandel, BR
Stern, SA
Thomas, N
Yelle, RV
机构
[1] US Geol Survey, Flagstaff, AZ 86001 USA
[2] SW Res Inst, Space Sci & Engn Div, San Antonio, TX 78228 USA
[3] Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA
[4] Univ Arizona, Dept Planetary Sci, Tucson, AZ 85721 USA
[5] Univ Arizona, Dept Astron, Tucson, AZ 85721 USA
[6] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
[7] Gernam Aerosp Ctr, Inst Plantary Sci, D-12489 Berlin, Germany
[8] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA
[9] SW Res Inst, Dept Space Studies, Boulder, CO 80302 USA
[10] Inst Phys, Space Res & Planetol Div, CH-3012 Bern, Switzerland
基金
美国国家航空航天局;
关键词
comet; imaging; nucleus; topography; coma; dust jet; short-period comets; 19P/Borrelly; Borrelly; deep space 1; rotation axis; rotation pole;
D O I
10.1016/j.icarus.2003.07.008
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The nucleus, coma, and dust jets of short-period Comet 19P/Borrelly were imaged from the Deep Space 1 spacecraft during its close flyby in September 2001. A prominent jet dominated the near-nucleus coma and emanated roughly normal to the long axis of nucleus from a broad central cavity. We show it to have remained fixed in position for more than 34 hr, much longer than the 26-hr rotation period. This confirms earlier suggestions that it is co-aligned with the rotation axis. From a combination of fitting the nucleus light curve from approach images and the nucleus' orientation from stereo images at encounter, we conclude that the sense of rotation is right-handed around the main jet vector. The inferred rotation pole is approximately perpendicular to the long axis of the nucleus, consistent with a simple rotational state. Lacking an existing IAU comet-specific convention but applying a convention provisionally adopted for asteroids, we label this the north pole. This places the sub-solar latitude at similar to 60degrees N at the time of the perihelion with the north pole in constant sunlight and thus receiving maximum average insolation. (C) 2003 Elsevier Inc. All rights reserved.
引用
收藏
页码:4 / 15
页数:12
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