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Title:
Direct Measurement of the Size of 2003 UB313 from the Hubble Space Telescope
Authors:
Brown, M. E.; Schaller, E. L.; Roe, H. G.; Rabinowitz, D. L.; Trujillo, C. A.
Affiliation:
AA(Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125 ), AB(Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125 ), AC(Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125 ), AD(Department of Physics, Yale University, New Haven, CT 06520.), AE(Gemini Observatory, 670 North A'ohoku Place, Hilo, HI 96720.)
Publication:
The Astrophysical Journal, Volume 643, Issue 1, pp. L61-L63. (ApJL Homepage)
Publication Date:
05/2006
Origin:
UCP
Astronomy Keywords:
Comets: General, Infrared: Solar System, Minor Planets, Asteroids
DOI:
10.1086/504843
Bibliographic Code:
2006ApJ...643L..61B

Abstract

We have used the Hubble Space Telescope to directly measure the angular size of the large Kuiper Belt object 2003 UB313. By carefully calibrating the point-spread function of a nearby field star, we measure the size of 2003 UB313 to be 34.3+/-1.4 mas, corresponding to a diameter of 2400+/-100 km or a size ~5% larger than Pluto. The V-band geometric albedo of 2003 UB313 is 86%+/-7%. The extremely high albedo is consistent with the frosty methane spectrum, the lack of red coloring, and the lack of observed photometric variation on the surface of 2003 UB313. Methane photolysis should quickly darken the surface of 2003 UB313, but continuous evaporation and redeposition of surface ices appears capable of maintaining the extreme albedo of this body.
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