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

H. Campins, C. M. Telesco, D. J. Osip, George H. Rieke, Marcia J Rieke, B. Schulz

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Abstract

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 μm color temperatures of 126-6+11 and 137-9+14 K are obtained from the 1993 and 1994 observations, respectively. These temperatures are consistent with the Standard Thermal Model [STM; Lebofsky & Spencer, 1989, Asteroids II, p. 128 (University of Arizona, Tucson)] 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. [Icarus, 60, 532 (1984)], and with recent occultation results [Buie et al, IAU Cire. 5898 (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.

Original languageEnglish (US)
Pages (from-to)2318-2322
Number of pages5
JournalAstronomical Journal
Volume108
Issue number6
StatePublished - Dec 1994

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Chiron
color
nuclei
radii
estimates
temperature
asteroid
albedo
occultation
asteroids

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

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Campins, H., Telesco, C. M., Osip, D. J., Rieke, G. H., Rieke, M. J., & Schulz, B. (1994). The color temperature of (2060) Chiron: A warm and small nucleus. Astronomical Journal, 108(6), 2318-2322.

The color temperature of (2060) Chiron : A warm and small nucleus. / Campins, H.; Telesco, C. M.; Osip, D. J.; Rieke, George H.; Rieke, Marcia J; Schulz, B.

In: Astronomical Journal, Vol. 108, No. 6, 12.1994, p. 2318-2322.

Research output: Contribution to journalArticle

Campins, H, Telesco, CM, Osip, DJ, Rieke, GH, Rieke, MJ & Schulz, B 1994, 'The color temperature of (2060) Chiron: A warm and small nucleus', Astronomical Journal, vol. 108, no. 6, pp. 2318-2322.
Campins H, Telesco CM, Osip DJ, Rieke GH, Rieke MJ, Schulz B. The color temperature of (2060) Chiron: A warm and small nucleus. Astronomical Journal. 1994 Dec;108(6):2318-2322.
Campins, H. ; Telesco, C. M. ; Osip, D. J. ; Rieke, George H. ; Rieke, Marcia J ; Schulz, B. / The color temperature of (2060) Chiron : A warm and small nucleus. In: Astronomical Journal. 1994 ; Vol. 108, No. 6. pp. 2318-2322.
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AB - 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 μm color temperatures of 126-6+11 and 137-9+14 K are obtained from the 1993 and 1994 observations, respectively. These temperatures are consistent with the Standard Thermal Model [STM; Lebofsky & Spencer, 1989, Asteroids II, p. 128 (University of Arizona, Tucson)] 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. [Icarus, 60, 532 (1984)], and with recent occultation results [Buie et al, IAU Cire. 5898 (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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