CCD photometry of 2060 Chiron in 1985 and 1991

Details CCD photometry of 2060 Chiron in 1985 and 1991 CCD photometry of 2060 Chiron in 1985 and 1991

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993icar..104..234m&link_type=abstract

Icarus (ISSN 0019-1035), vol. 104, no. 2, p. 234-243.

Astronomy and Astrophysics

Astronomy

29

Astronomical Photometry, Charge Coupled Devices, Chiron, Comet Nuclei, Light Curve, Cn Emission, High Frequencies, Line Spectra

Scientific paper

CCD photometry of 2060 Chiron from two apparitions, in January 1985 and January 1991, is reported. No evidence is found for a change in the amplitude of Chiron's lightcurve with ecliptic longitude, as would be expected of an object having a high-obliquity rotational axis. An improved value for Chiron's synodic period is reported: 5.917813 +/- 0.000007 hr. No outbursts larger than one-half of one percent were found during the 1991 observations. Secular (yearly) change is due to the gradual dissipation and resupply of material (mainly dust) throughout the coma, while the impulsive (daily) brightenings are probably due to the sudden release of pockets of entrapped volatiles, such as CO2, CN, or possibly H2O.

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