Two distinct populations of Kuiper-belt objects

被引:126
作者
Tegler, SC [1 ]
Romanishin, W
机构
[1] No Arizona Univ, Dept Phys & Astron, Flagstaff, AZ 86011 USA
[2] Univ Oklahoma, Dept Phys & Astron, Norman, OK 73019 USA
关键词
D O I
10.1038/32108
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The discovery of the first member of the Kuiper belt(1)-a formerly hypothetical ancient reservoir of objects located beyond Neptune's orbit-started a revolution in our understanding of the outer Solar System: there is no longer a sharp edge at Pluto's orbit. About 60 Kuiper-belt objects, intermediate in size between comets and planets, are now known(2) to exist on stable circular orbits around the Sun, and no doubt many more objects await discovery. But owing to the recent discovery and intrinsic faintness of these objects, little has been done to explore their physical and chemical properties(3-8). Here we report the results of a two-year survey of the broad-band optical colours of about one-quarter of the known Kuiper-belt objects. We find that their colours indicate the presence of two distinct populations: one consists of objects whose surface colours are only slightly redder than the colour of the Sun, while the other consists of the reddest objects known in the Solar System.
引用
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页码:49 / 51
页数:3
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