ORBi: Sicardy B. - Size, density, albedo and atmosphere limit of dwarf planet Eris from a stellar occultation

Reference : Size, density, albedo and atmosphere limit of dwarf planet Eris from a stellar occultation


	Document type :	Scientific congresses and symposiums : Paper published in a journal
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/107656

Title :	Size, density, albedo and atmosphere limit of dwarf planet Eris from a stellar occultation
Language :	English
Author, co-author :	Sicardy, B. [Instituto de Astrofisica de Andalucia, Spain]
	Ortiz, J. L. [Observatorio do Valongo / UFRJ, Brazil]
	Assafin, M. [Université de Liège - ULg > 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, E. [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 - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image]
	Lecacheux, J. [Université de Liège - ULg > 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. [ > > ]
	Gillon, Michaël [ > > ]
	Manfroid, Jean [ > > ]
	Behrend, R. [ > > ]
	Widemann, T. [ > > ]
Publication date :	1-Oct-2011
Journal title :	EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. <A href="http://meetings.copernicus.org/epsc-dps2011">http://meetings.copernicus.org/epsc-dps2011</A>, p.137
Pages :	137
Audience :	International
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.
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/107656
Other URL :	http://adsabs.harvard.edu/abs/2011epsc.conf..137S

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