Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999astnm...5...15m&link_type=abstract
Astronomia UAI, N. 5, p. 15 - 18
Astronomy and Astrophysics
Astronomy
Comets: Ccd Photometry, Comets: Light Curves
Scientific paper
This contribution is based on the authors' five-year program of CCD photometry of faint comets, performed mainly with 20-cm and 36-cm telescopes, V filter and two CCDs. Recent apparition of comet Hale-Bopp proved to be an excellent opportunity to test the observing method, instrumentation and software even on a very bright comet. The authors found that their V observations of faint comets tend to be systematically fainter by 0.5 - 1 magnitude in spite of the fact that the CCDs record systematically more coma than human eye. The authors explained this with the fact that the human eye and V filter passbands are not the same and have thus different response to C2 which is the main emission from the coma. Additional troubles may appear with bright comets that have prominent inner tails, composed mainly of dust particles. In case of comet Hale-Bopp, it is shown that by carefully choosing the aperture radius, the resulting total V magnitudes are in good agreement with total values of experienced visual observers.
Dintinjana Bojan
Mikuz Herman
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