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ESO Large Programme on Trans-Neptunian Objects and Centaurs: Spectroscopic Investigation of Centaur 2001 BL41 and TNOs (26181) 1996 GQ21 and (26375) 1999 DE9*

A. Doressoundiram et al 2003 The Astronomical Journal 125 2721-2727   doi: 10.1086/374632  Help

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A. Doressoundiram1, G. P. Tozzi2, M. A. Barucci1, H. Boehnhardt3, S. Fornasier4 and J. Romon1
1 Laboratoire d'Etudes Spatiales et d'Instumentation en Astrophysique, Observatoire de Paris, F-92195 Meudon Principal Cedex, France
2 Osservatorio Astrofisico di Arcetri, INAF, Largo Enrico Fermi 5, I-50125 Firenze, Italy
3 Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
4 Dipartimento di Astronomia, Università di Padova, vicolo dell'Osservatorio 2, I-35122 Padova, Italy
E-mail: Alain.Doressoundiram@obspm.fr

ABSTRACT. Observational results that are part of an ESO Large Programme dedicated to the characterization of the physical properties of trans-Neptunian objects and Centaurs are presented. We report observations related to the Centaur 2001 BL41 and two trans-Neptunian objects, (26181) 1996 GQ21 and (26375) 1999 DE9. We present results from broadband photometry (JHK filters) and low-dispersion infrared spectroscopy performed with ISAAC at the Very Large Telescope, in Chile. None of the spectra show evidence of absorption features—in particular, water ice features. We use a radiative transfer model to investigate the surface composition of these icy and primitive outer solar system bodies. We suggest models composed of geographical mixtures of organic compounds and minerals.

Key words: Kuiper Belt; minor planets, asteroids; techniques: photometric; techniques: spectroscopic

* Based on observations collected at the European Southern Observatory, Paranal, Chile (program 167.C-0340).

Print publication: Issue 5 (2003 May)
Received 2003 January 3, accepted for publication 2003 February 5

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