Optical spectroscopy of comet C/1995 O1 Hale-Bopp

Details Optical spectroscopy of comet C/1995 O1 Hale-Bopp Optical spectroscopy of comet C/1995 O1 Hale-Bopp

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.278l..37f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 278, Issue 2, pp. L37-L40.

Astronomy and Astrophysics

Astronomy

18

Comets: Individual: Hale-Bopp

Scientific paper

We report the results of optical CCD spectroscopy of comet C/1995 O1 Hale-Bopp on 1995 August 30, when the comet was at a heliocentric distance of R_h=6.82 au. In the wavelength range 3300 to 5500A the dust coma is found to be red compared with solar colours. Near the nucleus and in the prominent jet observed at this time the dust is redder than in the surrounding coma, implying differences between the grain populations in these regions. Emission from the CN (0-0) band was detected at a level of (1.7+/-0.8)x10^-14 erg s^-1 cm^-2. This is the first reported optical detection of gas molecules in the coma. Monte Carlo modelling gives an outgassing rate of Q(CN)=(6+/-3)x10^25 molecule s^-1 at this time. From a comparison of these and other reported observations, Hale-Bopp appears to be a normal comet, albeit highly active.

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