Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...408..767k&link_type=abstract
Astronomy and Astrophysics, v.408, p.767-774 (2003)
Astronomy and Astrophysics
Astrophysics
27
Comets: Individual: 67P/Churyumov-Gerasimenko, Techniques: Photometric
Scientific paper
Light curves and images of 67P/Churyumov-Gerasimenko are presented for the 2002-2003 apparition based on amateur CCD monitoring using a standardised method to produce consistent photometry in Johnson-Kron-Cousins system. Multiaperture data shows a large outburst at perihelion during which dust production increased by a factor of 2 to give a peak value of Afrho ~350 cm. A similar outburst was seen at the same epoch of the previous apparition in 1995-96 and probably in 1982-83, suggesting that the light curve is similar at succesive returns. A considerable change is seen in the slope of the light curve at r=1.85 AU (T+140 days) corresponding to a second significant increase in dust production. Overall though the dust production shows a very steep dependence with heliocentric distance, falling as r-5.8.
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