Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icq....23...93l&link_type=abstract
International Comet Quarterly (ISSN 0736-6922), Vol. 23, No. 3, (No. 119), p. 93 - 97 (2001)
Physics
1
Comets, Ccd Photometry, Comet C/1995 O1 (Hale-Bopp)
Scientific paper
Some 360 nights of CCD V-band photometry of the inner region (34") of comet C/1995 O1 (Hale-Bopp) were carried out over an interval of 4.47 years, beginning when the comet was at heliocentric distance r = 7.1 AU, continuing in to r = 1.02 AU, and ending finally at r = 10.3 AU. Before perihelion, the magnitude brightened fairly steadily, with power-law exponent n = 2.55, and - as has been shown elsewhere (Liller 1997) - a well-established 20-day (±5 days) periodicity persisted for a few months in late 1995. Following perihelion, the character of the light curve changed dramatically. The rate of fading was characterized at first by n = 4.46, but after passing r = 2.5 AU, the comet's brightness decreased irregularly at a rate of n ≍ 2.5, with the fading interrupted by at least five spectacular outbursts. The projected velocities of the outward flow of material ranged from 62 to 217 m/sec. After perihelion, the brightness of the quiescent comet averaged ≍0.18 magnitude fainter than before periohelion.
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