Comet p/ Halley Near Nucleus Phenomena in 1986

Details Comet p/ Halley Near Nucleus Phenomena in 1986 Comet p/ Halley Near Nucleus Phenomena in 1986

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..639l&link_type=abstract

Astronomy and Astrophysics, Vol.187, NO. 1+2/NOV, P. 639, 1987

Astronomy and Astrophysics

Astrophysics

24

Scientific paper

Computer enhanced high resolution groundbased images taken during Halley's most active phases in 1985-86 exhibit all of the coma structures seen in 1910 photographs. Improved detector technology compensated for the poor observing circumstances of the current apparition yielding a wealth of complex coma structure. This structure resulted mostly from discrete dust jet activity producing spirals, arcs, and jagged- edged envelopes. Several episodes of the "multiple nucleus" and antisunwardjet phenomenon were also observed. The variation in dust jet activity during the Vega and Giotto flybys is easily seen on the groundbased images. Our images of jets in the 388 nm CN (0,0) band show that they usually do not correlate very well with visible dust jets. As in 1910, the observed expansion velocities and jet curvature indicate a rotation period near 2.2 days. Because the short period dominates the shape of the jets, detailed jet modeling will be required to detect longer term rotation components such as the proposed 7.4 day period.

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