Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99..154m&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, Feb. 1987, p. 154-157.
Astronomy and Astrophysics
Astronomy
1
Astronomical Photometry, Halley'S Comet, Infrared Photometry, Near Infrared Radiation, Color, Magnitude, Reflectance, Comets, Halley, Photometry, Astronomy, Infrared, Wavelengths, Analysis, Color, Reflectivity, Magnitude, Earth-Based Observations, Procedure, Telescope Methods, Comae, Parameters
Scientific paper
Near IR photometric observations of Comet Halley obtained at the Cerro Tololo Inter-American Observatory in 1985 are presented and examined. It is observed that (K-L) is affected by thermal emission; for heliocentric distances greater than about 2 AU; (J-H) and (H-K) are significantly redder than normally found in comets; and as the heliocentric distance decreases Halley is bluer and has more usual color. The scattering cross-sectional area of the coma within the field of view and the reduced J, K, H, and L magnitudes for the comet are calculated. The data reveal that in each line the reflectivity increases from J to K band and J and H scattering efficiency increases as the comet approaches the sun.
Kawara Kimiaka
Matsuura Oscar T.
Picazzio Enos
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