Photometric investigation of Comets Bradfield 1987S and P/Borrelly

Details Photometric investigation of Comets Bradfield 1987S and P/Borrelly Photometric investigation of Comets Bradfield 1987S and P/Borrelly

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...220..286b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 220, no. 1-2, Aug. 1989, p. 286-292.

Astronomy and Astrophysics

Astronomy

14

Astronomical Photometry, Carbon, Comets, Abundance, Cosmic Dust, Emission Spectra, Ubv Spectra, Comets, Photometry, Astronomy, Bradfield, Borrelly, Production Rates, Earth-Based Observations, Gases, Dust, C2 Radical, C3 Radical, Cyanogen, Cn Radical, Solar Radiation, Pressure, Velocity, Orbital Elements, Fluorescence

Scientific paper

Photometric observations of Comets Bradfield 1987S and P/Borrelly were obtained with the ESO 1m-telescope in 3 nights between October 18 and 21, 1987, using narrow-band IAU cometary filters and broad-band UBV filters. Absolute production rates of C2, C3 and CN as well as relative dust production rates were derived. Both objects exhibit very similar ratios of their gas production rates for the three different molecules. Comet Bradfield 1987S was very dusty compared with P/Borrelly and P/Halley. The dust continua of the objects observed show deviations from a linear relation between continuum flux and projected diaphragm radius. This effect is attributed to the combined influence of the solar radiation pressure and the terminal velocity of the dust, which lead to an asymmetric dust distribution in the coma visible through the diaphragm. The broad-band U magnitudes of P/Borrelly are influenced by the strong CN emission feature, while the B and V fluxes exhibit similar deviations from the linear increase with diaphragm diameter like the narrow-band dust continuum filters.

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