期刊
ICARUS
卷 252, 期 -, 页码 271-276出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.icarus.2015.01.015
关键词
Comets; Comets, nucleus; Comets, dust; Centaurs; Occultations
资金
- National Aeronautics and Space Administration, Science Mission Directorate, Planetary Astronomy Program [NNX-08AE38A]
- NASA Planetary Astronomy Grant [NNX10AB27G]
- National Research Foundation (NRF) of South Africa
- NASA [NNX10AB27G, 136467] Funding Source: Federal RePORTER
On 29 November 2011 UT, 2060 Chiron occulted a R = 14.9-mag star; data were successfully obtained at the 3-m NASA Infrared Telescope Facility (IRTF) on Mauna Kea and 2-m Las Cumbres Observatory Global Telescope Network (LCOGT) Faulkes Telescope North (FTN) at Haleakala. The MORIS lightcurve shows a solid-body detection of Chiron's nucleus with a chord duration of 16.0 +/- 1.4 s, corresponding to a chord length of 158 +/- 14 km. Symmetric, dual extinction features in the FTN light curve indicate the presence of optically thick material roughly 300 km from the body midpoint. The duration of the features indicates a 3 +/- 2 km feature separated by 10-14 km from a second 7 +/- 2 km feature. The symmetry, optical thickness, and narrow size of these features allow for the intriguing possibility of a near-circular arc or shell of material. (C) 2015 Elsevier Inc. All rights reserved.
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