Albedo maps of Comets P/Giacobini-Zinner and P/Halley

Details Albedo maps of Comets P/Giacobini-Zinner and P/Halley Albedo maps of Comets P/Giacobini-Zinner and P/Halley

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250b..73h&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 2: Dust and Nucleus p 73-76 (SEE N87

Astronomy and Astrophysics

Astronomy

Albedo, Cosmic Dust, Giacobini-Zinner Comet, Halley'S Comet, Thematic Mapping, Comet Nuclei, Infrared Astronomy, Space Observations (From Earth), Spatial Distribution, Visible Spectrum

Scientific paper

Near-simultaneous infrared and visual maps of P/Giacobini-Zinner (P/G-Z) and P/Halley are combined to create maps of the spatial variation of geometric albedo. P/G-Z shows a minimum in albedo near 0.07 with an increase of a factor of 2 over about 30 arcsec. The lowest albedos are offset from the nucleus in the anti-sunward direction, coincident with a dust tail observed in the IR. The P/Halley albedos are higher than those found for P/G-Z and range from 0.2 - 0.4, but the trend of darker albedo in the anti-sunward direction (along the tail) is the same. The authors attribute the albedo distribution to large, dark, fluffy grains confined to the orbital plane close to the nucleus. The high albedo values in P/Halley may be due to enhanced flux in the visual image because of the comet's very small phase angle.

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