Observations of dust halos and the velocity of ejecta from comet C/1995 O1.

Details Observations of dust halos and the velocity of ejecta from comet C/1995 O1. Observations of dust halos and the velocity of ejecta from comet C/1995 O1.

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998icq....20..107b&link_type=abstract

International Comet Quarterly, Vol. 20, No. 3, p. 107 - 111

Physics

Cometary Comae: Dust Shells, Cometary Comae: Ejecta

Scientific paper

The authors present CCD images of comet C/1995 O1 (Hale-Bopp) taken between 2h and 3h UT on 1997 April 14, using the U.S. Air Force Academy's 61 cm telescope. These images, taken when C/1995 O1 was near perihelion, reveal the existence of five distinct halos in the comet's coma. The halos are thought to be remnants of material ejected from active spots on the rotating comet's nucleus. The images clearly show material linking the nuclear region with the innermost halo. Using the spacing between the halos and the known rotational period of the nucleus, the authors estimate the velocity of the nuclear ejecta to be 0.544±0.009 km/sec, which is in good agreement with empirical models.

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