High-resolution imaging studies of the near-nucleus regions of comets

Details High-resolution imaging studies of the near-nucleus regions of comets High-resolution imaging studies of the near-nucleus regions of comets

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.153g&link_type=abstract

In ESA Proceedings or the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 153-156 (SEE N87

Astronomy and Astrophysics

Astronomy

Astronomical Photometry, Comet Nuclei, Giacobini-Zinner Comet, Halley'S Comet, Comet Tails, Cometary Atmospheres, International Sun Earth Explorer 3, Interplanetary Magnetic Fields, Spectrophotometry

Scientific paper

High-resolution, calibrated images of the near-nucleus regions of Halley, Giacobini-Zinner (for ICE encounter) and additional comets displaying widely differing levels of activity were acquired with a CCD sensor at the Cassegrain focus of the 3.6 m Canada-France-Hawaii Telescope (CFHT). The International Halley Watch designated interference filters were used. Successful correlation of ICE magnetic field data with the optical images obtained with the CFHT on the night of encounter (11 Sept. 1985) primarily through the H2O(+) and neighboring continuum passbands and with 300 km spatial resolution provokes reinterpretation of the observed structure of cometary ion tails. The observations of Halley, limited by bad weather, were made at significant periods of the apparition: the first, in December 1984 with the comet at 5.3 AU during the period of the onset of activity; and the last, in November 1985 with the comet near opposition. The December observations show evidence of residual activity. The 18 November data show a highly-condensed inner coma with an extreme falloff in brightness from the region of the nucleus. These data provide the basis for characterizing the gas and dust environment in the immediate vicinity of the active nucleus.

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