1998 SM165: a large Kuiper belt object with an irregular shape.

Romanishin W; Tegler SC; Rettig TWConsolmagno GBotthof B

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1998 SM165: a large Kuiper belt object with an irregular shape.

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The recent discovery of an ancient reservoir of icy bodies at and beyond the orbit of Neptune-the Kuiper belt-has opened a new frontier in astronomy. Measurements of the physical and chemical nature of Kuiper belt objects (KBOs) can constrain our ideas of the processes of planet formation and evolution. Our 1.8-m Vatican Advanced Technology Telescope and charge-coupled device camera observations of the KBO 1998 SM(165) indicate its brightness periodically varies by 0.56 magnitudes over a 4-h interval. If we assume a uniform albedo of 0.04, which is typical of values found in the literature for a handful of KBOs, and an "equator-on" aspect, we find 1998 SM(165) has axes of length 600 x 360 km. If our assumptions are correct, such dimensions put 1998 SM(165) among the largest elongated objects known in our solar system. Perhaps long ago, two nearly spherical KBOs of comparable size coalesced to form a compound object, or perhaps 1998 SM(165) is the residual core of a catastrophic fragmentation of a larger precursor.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2001年第21期|11863-11866|共4页
作者
Romanishin W; Tegler SC; Rettig TWConsolmagno GBotthof B;
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作者单位

Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019, USA.;

bi.ernet.in;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
SIZES; brightness; meter; Telescope; Length;

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1998 SM165: a large Kuiper belt object with an irregular shape.

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