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Title:
Optical Spectroscopy of the Large Kuiper Belt Objects 136472 (2005 FY9) and 136108 (2003 EL61)
Authors:
Tegler, S. C.; Grundy, W. M.; Romanishin, W.; Consolmagno, G. J.; Mogren, K.; Vilas, F.
Affiliation:
AA(Department of Physics and Astronomy, Northern Arizona University, Flagstaff, AZ, USA; ), AB(Lowell Observatory, Flagstaff, AZ, USA), AC(Department of Physics and Astronomy, University of Oklahoma, Norman, OK, USA), AD(Vatican Observatory, Vatican City; and Department of Physics, Fordham University, New York, NY, USA), AE(Department of Physics and Astronomy, Northern Arizona University, Flagstaff, AZ, USA), AF(MMT Observatory, University of Arizona, Tucson, AZ, USA)
Publication:
The Astronomical Journal, Volume 133, Issue 2, pp. 526-530. (AJ Homepage)
Publication Date:
02/2007
Origin:
UCP
AJ Keywords:
Kuiper Belt, Techniques: Spectroscopic
Abstract Copyright:
(c) 2007: The American Astronomical Society
DOI:
10.1086/510134
Bibliographic Code:
2007AJ....133..526T

Abstract

We present high signal precision optical reflectance spectra of the large Kuiper Belt objects 2005 FY9 and 2003 EL61. The spectrum of 2005 FY9 exhibits strong CH4 ice bands. A comparison between the spectrum and a Hapke model indicates that the CH4 bands are shifted 3.25+/-2.25 Å relative to pure CH4 ice, suggesting the presence of another ice component on the surface of 2005 FY9, possibly N2 ice, CO ice, or Ar. The spectrum of 2003 EL61 is remarkably featureless. There is a hint of an O2 ice band at 5773 Å however, this feature needs to be confirmed by future spectroscopic observations of 2003 EL61 with a higher continuum signal precision sufficient to detect a second, weaker O2 ice band at 6275 Å.
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