CN jets of Comet P/Halley: Rotational properties

Details CN jets of Comet P/Halley: Rotational properties CN jets of Comet P/Halley: Rotational properties

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.487s&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 487-491 (SEE N87

Computer Science

16

Cyano Compounds, Gas Jets, Halley'S Comet, Rotation, Axes Of Rotation, Charge Coupled Devices, Cosmic Dust, Image Analysis

Scientific paper

An analysis of CCD images of CN jets of comet P/Halley observed during April 16 - 29, 1986 from Western Australia is discussed. This analysis questions the widely accepted 53 hour rotation period and favors a rotational period of about 7.37 days, as suggested by Millis and Schleicher. It further shows that a change in rotation period, at least from one apparition to the next, is also possible. A lower limit for the ejection velocity of dust grains (which emit CN) in the jet is established to be 0.5 km/sec with an uncertainty of about 50%. The constraints on the direction of the rotation axis as inferred from the geometry of the jets are also discussed.

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