Time variable coma structures in comet P/Swift-Tuttle.

Details Time variable coma structures in comet P/Swift-Tuttle. Time variable coma structures in comet P/Swift-Tuttle.

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26as..107..101b&link_type=abstract

Astronomy and Astrophysics Suppl. 107, 101-120 (1994)

Astronomy and Astrophysics

Astrophysics

28

Comet P/Swift-Tuttle

Scientific paper

B, V, R and IHW filter (CN, CO+, BC, C_2_) CCD imaging of comet P/Swift-Tuttle was performed from 28 October to 27 November 1992. Numerical adaptive Laplace filtering of the images revealed five types of coma features: dust and gas jets from three sources on the nucleus, a dust fan close to the Sun direction, brightness excess areas which partly coincided with the CN gas jets in the coma, and dust and ion tail streamers partly superimposed on other coma features. A synodic rotation period of 2.795 days was determined by linear regression of two of the three jet sources. The third source showed systematic deviations in the residuals between measured and calculated position angles which indicate projection effects in the jet emission directions as seen from the Earth. The coma fan is interpreted as being due to a near-polar possibly multiple activity region and thus may point close to the direction of the projected nucleus rotation axis. The dust jet activity was concentrated to the sunward coma hemisphere with strong particle production over about 0.8day of the rotation cycle. The CN gas emission of the jet sources remained almost continuously active over the whole nucleus rotation. The projected radial and lateral gas expansion velocities in two of the three CN jets were derived (0.8 to 1.8km/s with systematic variations over the rotation cycle). Our results for the rotation motion of P/Swift-Tuttle is in agreement with those of Yoshida et al. (1993) and with Sekanina (1981) from the 1992 and 1862 apparitions, respectively. Minor discrepancies in the derived periods and in the interpretation of coma features are discussed.

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