Comet P/Grigg-Skjellerup: ground-based observations after the encounter with the Giotto spacecraft.

Details Comet P/Grigg-Skjellerup: ground-based observations after the encounter with the Giotto spacecraft. Comet P/Grigg-Skjellerup: ground-based observations after the encounter with the Giotto spacecraft.

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ncimc..16..769m&link_type=abstract

Nuovo Cimento C, Vol. 16, N. 6, p. 769 - 773

Physics

Comet 1992 Xviii Grigg-Skjellerup, Comets: Infrared Photometry

Scientific paper

After the encounter with the Giotto spacecraft, the comet P/Grigg-Skjellerup was observed with the 2.2 m ESO telescope. Imaging in the V and R bands and infrared photometry with the J and H filters were performed. From the radial enhancement of the images the authors derived that the R frame mainly concerns the dust tail of the comet. Thus they applied the inverse numerical method of dust tail analysis in order to estimate the following cometary-grain parameters: ejection velocity, anisotropy of the emission, size distribution and loss rate. This from the observations back in time to the Giotto encounter. From infrared observation one could calculate the J and H magnitudes and the colour index J-H = 0.4 consistent with previous measurements of the comet.

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