Volume 439, Number 2, August IV 2005
|Page(s)||L1 - L4|
|Published online||29 July 2005|
Letter to the Editor
Is Sedna another Triton?
LESIA, Observatoire de Paris, 92195 Meudon Principal Cedex, France e-mail: [antonella.barucci;frederic.merlin;catherine.debergh]@obspm.fr
2 NASA Ames Research Center, MS 245-6, Moffett Field, CA 94035-1000, USA e-mail: Dale.P.Cruikshank@nasa.gov
3 INAF-OAR Via Frascati 33, 00040 Monteporzio Catone (Roma), Italy e-mail: email@example.com
4 IAS, Université Paris-Sud, 91405 Orsay Cedex, France e-mail: firstname.lastname@example.org
5 SETI Institute, Mountain View, CA & NASA Ames Research Center, USA e-mail: email@example.com
6 Dipartimento di Astronomia, Vicolo dell'Osservatorio 2, 35122 Padova, Italy e-mail: firstname.lastname@example.org
Accepted: 20 June 2005
90377 Sedna is, so far, the largest and most distant trans-neptunian object. It was observed at visible and near-infrared wavelengths using simultaneously two 8.2 m telescopes at the Very Large Telescope of the European Southern Observatory. The spectrum of Sedna suggests the presence on its surface of different ices (total abundance >50%). Its surface composition is different from that determined for other trans-neptunian objects, and apparently resembles that of Triton, particularly in terms of the possible presence of nitrogen and methane ices.
Key words: TNOs / visible / infrared / spectroscopy / photometry
© ESO, 2005
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