CN, C2, and dust observed in Comet P/Grigg-Skjellerup from the ground eight hours after the Giotto encounter

Details CN, C2, and dust observed in Comet P/Grigg-Skjellerup from the ground eight hours after the Giotto encounter CN, C2, and dust observed in Comet P/Grigg-Skjellerup from the ground eight hours after the Giotto encounter

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268l...9j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 2, p. L9-L12.

Astronomy and Astrophysics

Astrophysics

20

Cyano Compounds, Giotto Mission, Grigg-Skjellerup Comet, Interplanetary Dust, Astronomical Spectroscopy, Charge Coupled Devices, Image Analysis, Comets, Grigg-Skjellerup, Neutral Particles, Dust, Spectroscopy, Carbon, Cn Radical, Production Rate, Earth-Based Observations, Gases, Distribution, Telescope Methods, Spectra, Comae, Comparisons, Near-Infrared, Wavelengths, Optical Properties

Scientific paper

Comet P/Grigg-Skjellerup was observed with the 3.6m and 1.5m telescopes of ESO 8 hours after the encounter of Giotto with the comet. The CN and C2 production rates QCN and QC2 have been derived from a spectrum obtained at the 1.5m telescope. We find log(QCN) = 24.60 +/- 0.07 and log(QC2) = 24.42 +/- 0.06. From a direct image of the comet, obtained by averaging five individual images taken at the 3.6 m telescope through a special red wide-band filter, the distribution and content of the dust of Comet P/Grigg-Skjellerup can be studied. The power exponent of the dependence of the azimuthally smoothed cometary intensity on projected distance equals -1.38. This low value may be caused by the influence of radiation pressure. The product geometric albedo x phase function x filling factor x projected distance amounts to 3.8 cm. The values agree with measurements from previous apparitions. The results indicate that the dust to gas ratio of Comet P/Grigg-Skjellerup is about three times lower than that of Comet P/Halley.

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