Comet 169P/NEAT(=2002 EX12): The Parent Body of the α-Capricornid Meteoroid Stream

Details Comet 169P/NEAT(=2002 EX12): The Parent Body of the α-Capricornid Meteoroid Stream Comet 169P/NEAT(=2002 EX12): The Parent Body of the α-Capricornid Meteoroid Stream

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aj....140.1806k&link_type=abstract

The Astronomical Journal, Volume 140, Issue 6, pp. 1806-1813 (2010).

Astronomy and Astrophysics

Astronomy

1

Comets: General, Meteorites, Meteors, Meteoroids, Minor Planets, Asteroids: General

Scientific paper

The Jupiter-family comet 169P/NEAT (previously known as asteroid 2002 EX12) has a dynamical association with the α-Capricornid meteoroid stream. In this paper, we present photometric observations of comet 169P/NEAT to further investigate the physical characters of its disintegration state related to the stream. The comet shows a point-like surface brightness profile limiting contamination due to coma emission to ~4% at most, indicating no evidence of outgassing. An upper limit on the fraction of the surface that could be sublimating water ice of <10-4 is obtained with an upper limit to the mass loss of ~10-2 kg s-1. The effective radius of nucleus is found to be 2.3 ± 0.4 km. Red filter photometry yields a rotational period of 8.4096 ± 0.0012 hr, and the range of the amplitude 0.29 ± 0.02 mag is indicative of a moderately spherical shape having a projected axis ratio ~1.3. The comet shows redder colors than the Sun, being compatible with other dead comet candidates. The calculated lost mass per revolution is ~109 kg. If it has sustained this mass loss over the estimated 5000 yr age of the α-Capricornid meteoroid stream, the total mass loss from 169P/NEAT (~1013 kg) is consistent with the reported stream mass (~1013-1015 kg), suggesting that the stream is the product of steady disintegration of the parent at every return.

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