Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..768f&link_type=abstract
In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J
Astronomy and Astrophysics
Astronomy
Comets, Light Curves
Scientific paper
The light curves of ten comets (C/2000 SV74 (LINEAR) C/2000 WM1 (LINEAR) C/2001 A2 (LINEAR) C/2001 OG108 (LONEOS) C/2002 C1 (Ikeya-Zhang) C/2002 F1 (Utsunomiya) C/2002 O4 (Hoenig) C/2002 V1 (NEAT) C/2002 X5 (Kudo-Fujiakawa) and 19P-Borrelly) were constructed on the basis of visual physical observations of these comets. Photometric parameters H10 (Vsekhsvyatskii’s absolute magnitude) Hy (absolute magnitude) and n (photometric parameter that characterizes the rate of change of cometary brightness with heliocentric distance) were determined. The analysis of light curves is showed that the parameter n of seven comets (C/2001 A2 C/2001 OG108 C/2002 C1 C/2002 F1 C/2002 O4 C/2002 V1 and 19P) undergoes abrupt changes. We found that these jumps in the rate of change of the cometary brightness were correlated with outbursts of comets. The statistically significant (reliability > 0.95) influence of the phase dependence on the visual light curves for three comets had been found. The values of phase coefficient (beta) for these comets were determined: 1). C/2001 A2: beta = 0.086 (+/-) 0.027 m/degree (before perihelion) 2). C/2001 OG108: beta = 0.032 (+/-) 0.025 m/degree (before perihelion) and 0.052 (+/-) 0.016 m/degree (after perihelion) 3). C/2002 V1: beta = -0.062 (+/-) 0.010 m/degree (before perihelion).
Churyumov Klim I.
Filomenko Vitaly S.
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