CCD Photometry and Radii of Eight Jupiter-Family Comets

Details CCD Photometry and Radii of Eight Jupiter-Family Comets CCD Photometry and Radii of Eight Jupiter-Family Comets

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.0203w&link_type=abstract

American Astronomical Society, DPS meeting #40, #2.03; Bulletin of the American Astronomical Society, Vol. 40, p.387

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We are conducting a program of CCD photometry of Jupiter-family comets (JFCs) when they are far from the Sun, in order to image the inactive nucleus. The photometry is used to estimate the nucleus sizes and shapes, assuming a typical cometary albedo of 0.04 and a phase coefficient of 0.035 magnitudes/degree. We used the Palomar 5m telescope and Large Format Camera to search for 12 distant JFCs on September 25-26, 2006 (UT). Of the 12, two were not detected (79P, 143P) and two were active (74P, 116P) at distances of 4.54 AU and 4.72 AU from the Sun, respectively. Measured magnitudes and estimated mean radii for the remaining eight comets are shown in the Table below. We will discuss the implications of the latest measurements for the size distribution of JFC nuclei. This work was performed at the Jet Propulsion Laboratory with support from the NASA Planetary Astronomy Program.

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