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Temperature of Nitrogen Ice on Pluto and Its Implications for Flux Measurements

✍ Scribed by Kimberly A. Tryka; Robert H. Brown; Dale P. Cruikshank; Tobias C. Owen; Thomas R. Geballe; Catherine Debergh

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 680 KB
Volume: 112
Category: Article
ISSN: 0019-1035
DOI: 10.1006/icar.1994.1202

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✦ Synopsis

Previous work by K.A. Tryka et al. (Science 261, 751-754, 1993) has shown that the profile of the 2.148-micrometers band of solid nitrogen can be used as a "thermometer" and determined the temperature of nitrogen ice on Triton to be 38(+2)-1 K. Here we reevaluate that data and refine the temperature value to 38 +/- 1 K. Applying the same technique to Pluto we determine that the temperature of the N2 ice on that body is 40 +/- 2 K. Using this result we have created a nonisothermal flux model of the Pluto-Charon system. The model treats Pluto as a body with symmetric N2 polar caps and an equatorial region devoid of N2. Comparison with the infrared and millimeter flux measurements shows that the published fluxes are consistent with models incorporating extensive N2 polar caps (down to +/- 15 degrees or +/- 20 degrees latitude) and an equatorial region with a bolometric albedo < or = 0.2.

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