Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-03-10
Astronomy and Astrophysics
Astrophysics
v2: typos corrected. 13 pages, 5 figures, 1 table, ApJ Letters, in press
Scientific paper
10.1086/588095
Eleven years after its perihelion, comet C/1995 O1 (Hale-Bopp) is still active. Between October 20--22, 2007, we detected a diffuse coma of 180x10^3$km in diameter with a slight elongation toward N/S direction. The integrated brightness was 20.04 mag in R_C, implying Af\rho=300 m and albedo x dust surface $a_RC$=4300 km^2. The coma was relatively red at V-R=0.66 mag, which is consistent with that of the dust in other comets. The observed properties and the overall fading in brightness between 10 AU and 26 AU follow the predicted behaviour of CO-driven activity (Capria et al. 2002). This is the most distant cometary activity ever observed.
Kiss Laszlo L.
Sarneczky Krisztián
Szabo Gy. M.
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