Visible Lightcurve Observations of Comet 19p/Borrelly

Details Visible Lightcurve Observations of Comet 19p/Borrelly Visible Lightcurve Observations of Comet 19p/Borrelly

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002em%26p...90..463m&link_type=abstract

Earth, Moon, and Planets, v. 90, Issue 1, p. 463-471 (2002).

Physics

10

19P/Borrelly, Comets, Photometry, Rotation

Scientific paper

The final Deep Space 1 (DS1) mission target, comet 19P/Borrelly, was observed from July 28-August 1, 2000 at the CTIO-1.5 m telescope in the R filter. The observed lightcurve has a large peak to peak variation between 0.84 mag and 1.0 mag. A period of 26.0 +/- 1 hr (assuming a double-peaked lightcurve) was found using all five nights. This is in good agreement with the period of 25.02 +/- 0.5 hr quoted by Lamy et al. (1998) using only 6 points of HST data and is also consistent with HST data taken around the DS1 encounter time by Weaver et al. (2002). Using the mean magnitude R = 20.8 mag and assuming a 4% albedo, we derive an effective nuclear radius of 2.6 km. The large lightcurve amplitude translates to a long to intermediate axial ratio a/b >= 2.2, in excellent agreement with the HST result of a/b >= 2.4 (Lamy et al., 1998) and with DS1 images (Soderblom et al., 2002).

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