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1996 PW
1996 PW is a small Solar System body on an orbit typical of long-period comets but that has shown no sign of cometary activity around the time it was discovered.〔 Simulations indicate that it has most likely come from the Oort cloud, with a roughly equal probability of being an extinct comet and a rocky body that was originally scattered into the Oort cloud.〔 The discovery of 1996 PW prompted theoretical research that suggests that roughly 1 to 2 percent of the Oort cloud objects is rocky.〔〔
1996 PW was discovered on 1996 August 9 by the Near-Earth Asteroid Tracking (NEAT) automated search camera on Haleakalā, Hawaii.〔 It is the first object that is not an active comet discovered on an orbit typical of long-period comets.〔
1996 PW has a rotation period of 35.44 ± 0.02 h and a double-peaked lightcurve with an amplitude of 0.44 ± 0.03 mag.〔 Its spectrum is moderately red and featureless,〔 typical of D-type asteroids and bare comet nuclei.〔〔〔 Its spectrum suggests an extinct comet.〔 The upper limit on 1996 PW's dust production is 0.03 kg/s.〔
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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