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Size, density, albedo and atmosphere limit of dwarf planet Eris from a stellar occultation
Sicardy, B.; Ortiz, J. L.; Assafin, M. et al.
2011In EPSC Abstracts, p. 137
 

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Abstract :
[en] We report the observation of a multi-chord stellar occultation by the dwarf planet (136199) Eris. The event was observed on November 6, 2010 UT, from two sites in Chile. Our observation is consistent with a spherical Eris with radius RE=1163±6 km, density =2.52±0.05 g cm-3, and visible geometric albedo pV=0.96+0.09 -0.04. Besides being remarkably similar in size to Pluto, Eris appears as one of the intrinsically brightest objects of the solar system, with a density suggesting a mainly rocky interior. Upper limits of about 1 nbar are derived for the surface pressure of possible nitrogen, argon or methane atmospheres of the dwarf planet.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Sicardy, B.;  Instituto de Astrofisica de Andalucia, Spain
Ortiz, J. L.;  Observatorio do Valongo / UFRJ, Brazil
Assafin, M.;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Jehin, Emmanuel  ;  San Pedro de Atacama Celestial Explorations, Chile
Maury, A.;  Observatoire de Paris-Meudon, Meudon Cédex, France (bruno.sicardy@obspm.fr)
Lellouch, Emmanuel;  Complejo Astronomico El Leoncito and San Juan National University, Argentina
Gil-Hutton, R.;  Observatoire de Paris-Meudon, Meudon Cédex, France ; Observatorio Nacional / MCT, Brazil
Braga-Ribas, F.;  Observatoire de Paris-Meudon, Meudon Cédex, France)
Colas, F.;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Lecacheux, J.;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Roques, F.
Santos-Sanz, P.
Morales, N.
Thirouin, A.
Camargo, J. I. B.
Vieira-Martins, R.
Behrend, R.
Widemann, T.
More authors (10 more) Less
Language :
English
Title :
Size, density, albedo and atmosphere limit of dwarf planet Eris from a stellar occultation
Publication date :
01 October 2011
Event name :
EPSC-DPS Joint Meeting 2011
Event date :
held 2-7 October 2011
Audience :
International
Journal title :
EPSC Abstracts
Pages :
137
Available on ORBi :
since 12 January 2012

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