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SICARDY, B; ORTIZ, J. L; LECACHEUX, J; ROQUES, F; SANTOS-SANZ, P; WIDEMANN, T; MORALES, N; DUFFARD, R; THIROUIN, A; CASTRO-TIRADO, A. J; JELINEK, M; KUBANEK, P; ASSAFIN, M; SOTA, A; SANCHEZ-RAMIREZ, R; ANDREI, A. H; CAMARGO, J. I. B; SILVA NETO, D. N. Da; RAMOS GOMES, A; VIEIRA MARTINS, R; GILLON, M; MANFROID, J; TOZZI, G. P; JEHIN, E; HARLINGTEN, C; SARAVIA, S; BEHREND, R; MOTTOLA, S; GARCIA MELENDO, E; PERIS, V; FABREGAT, J; MADIEDO, J. M; CUESTA, L; EIBE, M. T; MAURY, A; ULLAN, A; ORGANERO, F; PASTOR, S; DE LOS REYES, J. A; PEDRAZ, S; CASTRO, A; DE LA CUEVA, I; MULER, G; STEELE, I. A; CEBRIAN, M; LELLOUCH, E; MONTANES-RODRIGUEZ, P; OSCOZ, A; WEAVER, D; JACQUES, C; CORRADI, W. J. B; SANTOS, F. P; REIS, W; MILONE, A; EMILIO, M; GUTIERREZ, L; GIL HUTTON, R; BRAGA-RIBAS, F; COLAS, F; HESTROFFER, D
Nature, 10/2011, Volume: 478, Issue: 7370Journal Article, Web Resource
The dwarf planet Eris is a trans-Neptunian object with an orbital eccentricity of 0.44, an inclination of 44 degrees and a surface composition very similar to that of Pluto. It resides at present at 95.7 astronomical units (1 AU is the Earth-Sun distance) from Earth, near its aphelion and more than three times farther than Pluto. Owing to this great distance, measuring its size or detecting a putative atmosphere is difficult. Here we report the observation of a multi-chord stellar occultation by Eris on 6 November 2010 UT. The event is consistent with a spherical shape for Eris, with radius 1,163 ± 6 kilometres, density 2.52 ± 0.05 grams per cm(3) and a high visible geometric albedo, Pv = 0.96(+0.09)(-0.04). No nitrogen, argon or methane atmospheres are detected with surface pressure larger than ∼1 nanobar, about 10,000 times more tenuous than Pluto's present atmosphere. As Pluto's radius is estimated to be between 1,150 and 1,200 kilometres, Eris appears as a Pluto twin, with a bright surface possibly caused by a collapsed atmosphere, owing to its cold environment. We anticipate that this atmosphere may periodically sublimate as Eris approaches its perihelion, at 37.8 astronomical units from the Sun.
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