Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978icar...35..360n&link_type=abstract
Icarus, vol. 35, Sept. 1978, p. 360-368.
Astronomy and Astrophysics
Astronomy
19
Abundance, Astronomical Photometry, Astronomical Spectroscopy, Comets, Emission Spectra, Calibrating, Carbon, Cn Emission, Perihelions, Radiant Flux Density, Spectral Bands, Perihelion, Observations, Distance, Comets, Photometry, Encke, Comet, Evolution, Carbon, Brightness, Cyanogen
Scientific paper
Interference filter photometry was taken of Comet Encke on June 14, 1974 (1.07 AU heliocentric distance, postperihelion) at the CTIO (Cerro Tololo Interamerican Observatory) 150-cm reflector. Production rates were calculated as 4.1 x 10 to the 23nd power mol/sec for CN, 5.3 x 10 to 23nd power mol/sec for C3, and 4.3 x 10 to the 24th power mol/sec for C2. These are about three times smaller than at comparable heliocentric distance preperihelion, assuming a value of 100 for the ratio H2O/(C2 + C3 + CN). An upper limit was placed on the production of nonvolatiles at about one-third that of volatiles in mass by assuming a bulk density of 1 g/cu cm, a particle geometric albedo of 0.1, and a phase function of 0.2.
Johnson Torrence V.
Newburn Ray L.
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