Detection of the rotational motion of Comet P/Brorsen-Metcalf 1989

Details Detection of the rotational motion of Comet P/Brorsen-Metcalf 1989 Detection of the rotational motion of Comet P/Brorsen-Metcalf 1989

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasj...42l...7w&link_type=abstract

Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 42, no. 1, 1990, p. L7-L10.

Astronomy and Astrophysics

Astrophysics

1

Comet Nuclei, Comets, Rotating Bodies, Astronomical Observatories, Astronomical Photometry, Carbon, Charge Coupled Devices

Scientific paper

A CCD imaging observation of Comet P/Brorsen-Metcalf was carried out with a 188-cm telescope at the Okayama Astrophysical Observatory on August 3-4, 1989. A sunward fan-shaped structure of C2 molecules near the nucleus was found. The direction of the fan moved counterclockwise by about 6 deg in position angle during a 2-hour observation on August 4. If this fan is caused by an active region in the nucleus, this is the first detection of rotational motion. Assuming a simple rotation model with a high-latitude active region, two possible solutions for the rotation periods 13.5-15.0 hr and 30-40 hr were derived.

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