Observation of a rapid decrease in the brightness of the coma of 2060 Chiron in 1990 January

Details Observation of a rapid decrease in the brightness of the coma of 2060 Chiron in 1990 January Observation of a rapid decrease in the brightness of the coma of 2060 Chiron in 1990 January

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...366l..47b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 366, Jan. 1, 1991, p. L47-L49.

Astronomy and Astrophysics

Astronomy

14

Astronomical Photometry, Chiron, Comet Heads, Brightness Distribution, Charge Coupled Devices, Comet Nuclei, Light Curve, Asteroids, Comets, Chiron, Asteroid 2060, Brightness, Comae, Photometry, Optical Properties, Earth-Based Observations, Telescope Methods, Astronomy, Lightcurve, Magnitude, Timescale, Ccd Methods, Procedure

Scientific paper

Photometric observations of 2060 Chiron in the V and R filters were obtained with the 1.5-m telescope on Palomar Mountain during a 7-hr period on January 20, 1990 (UT). A general decrease of about 10 percent in integrated brightness occurred in both filters. No color dependence to the decrease was observed. A small (about 0.02 mag) rotational light curve, far smaller than the 0.09 mag (peak-to-peak) one observed by Bus et al. (1989) is superposed on the general decrease. On January 29, 1990, Luu and Jewitt (1990) observed an impulsive brightening of Chiron of approximately the same magnitude and time scale as the presently observed decrease in brightness. The combined results provide evidence that Chiron is currently exhibiting short-term fluctuations in the brightness of its coma, in addition to its well-established general decrease in brightness.

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