The color temperature of (2060) Chiron: A warm and small nucleus

The color temperature of (2060) Chiron: A warm and small nucleus

We present three sets of thermal-infrared observations of (2060) Chiron, obtained in 1991, 1993, and 1994. These observations allow the first estimates of the color temperature of Chiron as well as refined estimates of the radius and albedo of its nucleus. 10/20 micrometer color temperatures of 126(...

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Veröffentlicht in:The Astronomical journal 1994-12, Vol.108 (6), p.2318
Hauptverfasser: Campins, H., Telesco, C. M., Osip, D. J., Rieke, G. H., Rieke, M. J., Schulz, B.
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container_end_page
container_issue 6
container_start_page 2318
container_title The Astronomical journal
container_volume 108
creator Campins, H.
Telesco, C. M.
Osip, D. J.
Rieke, G. H.
Rieke, M. J.
Schulz, B.
description We present three sets of thermal-infrared observations of (2060) Chiron, obtained in 1991, 1993, and 1994. These observations allow the first estimates of the color temperature of Chiron as well as refined estimates of the radius and albedo of its nucleus. 10/20 micrometer color temperatures of 126(sub -6 sup +11) and 137(sub -9 sup +14) K are obtained from the 1993 and 1994 observations, respectively. These temperatures are consistent with the Standard Thermal Model (STM; Lebofsky & Spencer, 1989), but significantly higher than those predicted by the Isothermal Latitude Model. Our estimates of Chiron's radius based on the STM are in agreement with each other, with the observations of Lebofsky et al. (1984), and with recent occultation results (Buie et al., (1993). We obtained values for the radius of 74 +/- 11 km in 1991, 88 +/- 10 and 104 +/- 10 km in 1993, and, 94 +/- 6 and 91 +/- 13 km in 1994.
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title The color temperature of (2060) Chiron: A warm and small nucleus
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