Narrowband Filter Photometry of Five Comets

Emission fluxes of CN, C2 and C3 carbon-bearing molecular species observed in the coma of comets Bennett (1969i ≡ 1970II), West (1975n ≡ 1976VI), P Halley (1982i), Hartley-Good (19851) and Bradfield (1987s) are analysed in the framework of Haser model. CN, C2 and C3 production rates are determined using recently derived fluorescence efficiencies. The dependence of CN, C2 and C3 production rates on the heliocentric distance and the possible correlations among these radicals is studied and briefly discussed.

Evaluation of gas production rates in some comets

Spectral scans of Comet Bradfield (1987s) at heliocentric distance of 1.539 AU have been observed spectrophotometrically. The column densities and production rates of C2 and CN have been derived.

Spectrophotometry of Comet Bradfield (1987s)

Spectrophotometric observations of the head of comet Austin (1989 C1) during five nights in May 1990 are presented. Emission bands due to CN, C2 and C3 molecules have been identified. An estimate of their column densities and production rates have been made.

Spectrophotometric study of comet Austin (1989 C1)

Spectrophotometric observations of the head of comet Bradfield (1987 s) during three nights in 1987 are presented. An estimate of the CN, C2 and C3 column densities and production rates have been made.

Scanner observations of comet Bradfield (1987 s)

Spectrophotometric observations of head of comet Bradfield (1987s) during three nights in 1987 are presented. An estimate of the CN, C
2, and C
3 column densities and production rates have been made.

B. B. Sanwal

Papers

Spectrophotometric study of comet Bradfield (1987s)