Cometary Activity at 25.7 AU: Hale-Bopp 11 Years after Perihelion

  title={Cometary Activity at 25.7 AU: Hale-Bopp 11 Years after Perihelion},
  author={Gyula M. Szab{\'o} and L{\'a}szl{\'o} L. Kiss and Kriszti{\'a}n S{\'a}rneczky},
  journal={The Astrophysical Journal Letters},
  pages={L121 - L124}
Eleven years after its perihelion, comet C/1995 O1 (Hale-Bopp) is still active. Between 2007 October 20 and 22, we detected a diffuse coma of 180 × 103 km in diameter with a slight elongation toward the north-south direction. The integrated brightness was 20.04 mag in RC, implying Afρ = 300 m and albedo × dust surface aRC = 4300 km2. 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… 

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