P/Brorsen-Metcalf - Photometry, grain color and organic crust

Details P/Brorsen-Metcalf - Photometry, grain color and organic crust P/Brorsen-Metcalf - Photometry, grain color and organic crust

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..349b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 1, Nov. 1991, p. 349-355.

Astronomy and Astrophysics

Astrophysics

5

Astronomical Photometry, Comet Nuclei, Cometary Atmospheres, Organic Solids, Crusts, Emission Spectra, Galactic Cosmic Rays

Scientific paper

Photometric observations of Comet P/Brorsen-Metcalf obtained before its passage at perihelion are presented. The standard filters of the International Halley Watch: C2, BC, C3, CN, UC have been used. Gas production rates have been derived. These vary as r exp -n (where r is the comet-sun distance) with n = 3 (C2), 1.1 (C3) and 3.9 (CN). Production rates of solids follow the same law as gas with n = 2.3. The blue color exhibited by cometary grains may be interpreted as due to small grains dominating larger ones. The observations are discussed in the light of a model predicting the presence of an external organic cometary crust and radiation-processed organic materials coming out from fissures and patches in the crust.

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