VRI imaging of comet 46P/Wirtanen |
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| Institution: | 1. Université Paris-Saclay, INRAE, AgroParisTech, UMR SayFood, F-78850, Thiverval-Grignon, France;2. Université Paris-Saclay, INRAE, UR ALISS, 94205, Ivry-sur-Seine, France;3. Université d''Avignon, INRAE, UMR SQPOV, 84911 Avignon Cedex 9, France;1. The Norwegian Center for Child Behavioral Development, University of Oslo, Norway;2. The Department of Health Promotion and Development, University of Bergen, Norway;1. Department of Obstetrics, Gynecology & Reproductive Sciences, University of California San Francisco (UCSF), San Francisco, California;2. Center for Healthcare Value, University of California San Francisco (UCSF), San Francisco, California;3. Division of Cancer Prevention and Control, National Center for Chronic Disease Prevention and Health Promotion (NCCDPHP), Centers for Disease Control and Prevention, Atlanta, Georgia;4. CyberData Technologies, Herndon, Virginia;5. Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee |
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| Abstract: | Imaging of comet 46P/Wirtanen was performed in the standard VRI filters on 10 and 11 November 1996 with the 1.0 m telescope of the South African Astronomical Observatory (SAAO). After proper processing and calibration, the images have been used to derive information about the isophote distribution, magnitude and colour indices. We observed a coma extending to at most ～5×103 km. We derive absolute magnitudes of the coma for the different filters and the colours V?R = 0.18±0.17 and R?I = 0.39±0.16. The Afρ value (related to the dust production rate) for the R filter is 10.5±0.6 cm. The radial profile (azimuthally averaged) of the surface brightness in the R filter has a slope of ?0.9, which is consistent with a steady-state dust production. The results are compared with other observations in different periods. |
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