CCD photometry of distant comets

Details CCD photometry of distant comets CCD photometry of distant comets

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...349..649l&link_type=abstract

Astronomy and Astrophysics, v.349, p.649-659 (1999)

Astronomy and Astrophysics

Astrophysics

44

Techniques: Photometric, Comets: General

Scientific paper

While it is apparent that many comets are active beyond the canonical distance of 3 AU, few surveys of cometary activity have been performed in this region previously. Such a survey enables a more accurate determination of the proportion of comets that exhibit little or no outgassing at these distances. Results are presented of CCD observations of comets in the region of 3 AU <= Rh <= 6 AU obtained with the 1m JKT on La Palma. Photometric observations of 15 comets were obtained, 7 of which displayed coma activity and 8 of which appeared inactive. BVR photometry was performed on these comets to determine dimensions, colours and outgassing rates. Although 40P/Vaisala 1 and 26P/Grigg-Skjellerup were not detected, upper limits to their nuclear radii are presented. The results obtained are compared with previous observations.

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