The Nucleus of Comet 48P/Johnson

Details The Nucleus of Comet 48P/Johnson The Nucleus of Comet 48P/Johnson

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aj....127.1784j&link_type=abstract

The Astronomical Journal, Volume 127, Issue 3, pp. 1784-1790.

Astronomy and Astrophysics

Astronomy

19

Comets: General, Comets: Individual (48P/Johnson), Kuiper Belt

Scientific paper

We present new observations of short-period (Jupiter family) comet 48P/Johnson taken over several months when near ~4 AU heliocentric distance. CCD photometry shows that this object has a pointlike inner surface brightness profile. It varies cyclically in brightness, with a light-curve period 14.50+/-0.02 hr and photometric range ΔmR=0.32+/-0.05 mag. We attribute these variations to the rotation of a bare, aspherical nucleus with projected semiaxes 3.0×2.2 km (0.04 albedo assumed) and (two-peaked) rotation period 29.00+/-0.04 hr. The phase coefficient of the nucleus is 0.059+/-0.002 mag deg-1, consistent with a low-albedo surface. A faint tail is evident in a deep composite image but appears to contribute little to the nucleus signal.

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