Abstract
During the recent apparition of comet Hale—Bopp (1995 O1) near infrared photometric observations were carried out in the J, H, K filter bands and also in the 3.0—3.4 μm region at the 1.2 m telescope at Gurushikkar, India. The effective temperature of the comet was substantially higher than the equilibrium blackbody temperature. A mean superheat value of 1.83 was derived in the post-perihelion phase which implies that a large fraction of the grain population are made up of small and hot grains with radii <0.5 μm. High albedo values of ∼0.4 were also derived in the scattering angle range 135° to 160° which could explain the unusual brightness of comet Hale—Bopp.
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Chandrasekhar, T., Ashok, N.M., Tej, A. et al. Infrared Observations of Comet Hale–Bopp (C/1995 O1) from Gurushikhar Observatory. Earth, Moon, and Planets 81, 111–121 (1998). https://doi.org/10.1023/A:1006360910022
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DOI: https://doi.org/10.1023/A:1006360910022