CCD photometry of comet C/1995 O1

Details CCD photometry of comet C/1995 O1 CCD photometry of comet C/1995 O1

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icq....23....6m&link_type=abstract

International Comet Quarterly (ISSN 0736-6922), Vol. 23, No. 1, (No. 117), p. 6 - 16 (2001)

Computer Science

4

Comets, Ccd Photometry, Comet C/1995 O1 (Hale-Bopp)

Scientific paper

This contribution is based on our program of CCD photometry of faint comets, performed mainly with 20-cm and 36-cm telescopes, V filters, and two CCDs. The recent apparition of comet C/1995 O1 (Hale-Bopp) proved to be an excellent opportunity to test our observing method, instrumentation, and software on a very bright comet. We found that our V observations of faint comets tend to be systematically fainter by 0.5 - 1 magnitude, in spite of the fact that CCDs record systematically more coma than does the human eye. We expain this with the fact that the human-eye and V-filter passbands are not the same and have thus different responses to C2, which is the main emission from the coma. Additional problems may appear with bright comets that have prominent inner tails composed mainly of dust. In the case of comet C/1995 O1, we show that by carefully choosing the aperture radius, the resulting total (m1) V magnitudes are in good agreement with m1 values of experienced visual observers.

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