Other
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.278..671r&link_type=abstract
In ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets p 671-675 (SEE N88-21884 14-91)
Other
Colorimetry, Comet Nuclei, Halley'S Comet, Near Infrared Radiation, Brightness, Cosmic Dust, Granular Materials, Ice, Space Observations (From Earth)
Scientific paper
Near-infrared images of Comet Halley were obtained in the standard J, H, and K bandpasses, on 3.5 Nov. 1985 with an HgCdTe camera at a 1.54 m telescope. Each image covers 38.4 arcsec on the side. A well defined gradient in the J-H and H-K colors within 5000 km of the nucleus is discovered with the bluest colors at the photocenter. Surface brightness profiles steeper than the canonical 1/rho are observed in the same region. Analysis indicates that the color gradient and the brightness profiles can both be explained by the presence of volatile (dirty ice) grains in the inner coma. An outburst of very small (Rayleigh scattering) dust particles could also account for the observations, however, this model is not supported by the spacecraft measurements. No obvious jets or other structures are observed.
Campins Humberto
Rieke Marcia J.
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