Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933408m&link_type=abstract
American Astronomical Society, AAS Meeting #219, #334.08
Astronomy and Astrophysics
Astronomy
Scientific paper
The surface brightness distribution of comet C/2009 P1
Garrad was studied to identify structure and fragmentation within the nucleus of the comet. Surface brightness mapping was done by performing pixel by pixel photometry on images taken of the comet taken in July 2011 using the PARI 0.35-m prime focus telescope. Comet Garrad's surface brightness maps are compared to those of 1P/Halley (1986) obtained from digitized images from Dyer Observatory photographic plates. That ollection of plates are now located in the PARI Astronomical Photographic Data Archive. Through the technique of pixel by pixel photometry and surface brightness mapping, comet nuclei may be studied more fully than by pure imaging, and some of the difficult to image structure of comet nuclei may be revealed. Results will presented that show that the nucleus of C/2009/P1 Garrad is a single elongated object. However, it has the indications of possible future fragmentation as seen in the brightness maps of the comet.
Castelaz Michael
Cline James
Mehnert Herbert
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