Comet nucleus size distributions from HST and Keck telescopes

Details Comet nucleus size distributions from HST and Keck telescopes Comet nucleus size distributions from HST and Keck telescopes

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004icar..170..463m&link_type=abstract

Icarus, Volume 170, Issue 2, p. 463-491.

Physics

58

Comets, Nucleus Sizes, Colors, Distant Activity

Scientific paper

The Wide Field Camera (WFC) on the Hubble Space Telescope and the Low Resolution Imaging Spectrograph (LRIS) on the Keck II telescope have been used to image 21 distant dynamically new, long-period (LP) and short-period (SP) Jupiter-family (JF) comet nuclei (near aphelion), as part of a long-term program to search for physical differences between short-period comets and Oort cloud comets. WFC data were obtained on Comets C/1987 H1 (Shoemaker) and C/1984 K1 (Shoemaker) during Cycle 5 (1995 December) and on C/1988 B1 (Shoemaker), C/1987 F1 (Torres), and C/1983 O1 (Černis) during Cycle 6 (1997 April, May, and June). The HST comets were at heliocentric distances 20.4 < r[AU] < 29.5. Each comet observation was allocated 7 orbits, for ~3.6 hrs of integration. The most difficult part of the image reduction was the removal of cosmic rays. We present our scheme for cosmic ray removal. None of the HST comet nuclei was detected to the 3-σ level at mR~27. The inferred upper limits to the nucleus radii are 4.0RN)~RN-α with α=1.45+/-0.05, and for nuclei in the range 2-5 km, α=1.91+/-0.06. Statistical analysis and modeling shows that the slopes of the observed TNO and JF comet distributions are not compatible, suggesting that the intrinsic distribution of JF comet nuclei is a differential a-3.5 power law truncated at small nucleus radii between 0.3 and 2.0 km.

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