The anomalous behaviour of C2 in P/Borrelly 1987p

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Carbon, Comets, Calibrating, Cosmic Dust, Cyanogen

Scientific paper

Comet Bradfield 1987s and Comet P/Borrelly 1987p were observed between December 14 and December 22, 1987. The large-scale and near-nucleus CN profiles for both comets were fit to a simple radial outflow model with decay. At 1 AU, parent scalelengths of (2.3 + or - 0.2) x 10 to the 4th for CN and (2.1 + or - 0.2) x 10 to the 4th km for C2 were found. It is suggested that these short parent scalelengths could correspond to the scale for release from CHON grains. Although a proportion of the C2 in P/Borrelly is expected to be a produced by the CHON grains, the results suggest a second source which is noncentral.

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