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A Pluto-like radius and a high albedo for the dwarf planet Eris from an occultation.

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Title: A Pluto-like radius and a high albedo for the dwarf planet Eris from an occultation.
Authors: Sicardy, B., Ortiz, J. L., Assafin, M., Jehin, E., Maury, A., Lellouch, E., Hutton, R. Gil, Braga-Ribas, F., Colas, F., Hestroffer, D., Lecacheux, J., Roques, F., Santos-Sanz, P., Widemann, T., Morales, N., Duffard, R., Thirouin, A., Castro-Tirado, A. J., Jelínek, M., Kubánek, P.
Source: Nature. 10/27/2011, Vol. 478 Issue 7370, p493-496. 4p. 1 Diagram, 2 Graphs.
Subjects: Eris (Dwarf planet), Pluto (Dwarf planet), Albedo, Stellar activity, Occultations (Astronomy), Thermodynamic equilibrium
Abstract: 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 cm3 and a high visible geometric albedo, . 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. [ABSTRACT FROM AUTHOR]
Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: A Pluto-like radius and a high albedo for the dwarf planet Eris from an occultation.
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  Data: <searchLink fieldCode="AR" term="%22Sicardy%2C+B%2E%22">Sicardy, B.</searchLink><br /><searchLink fieldCode="AR" term="%22Ortiz%2C+J%2E+L%2E%22">Ortiz, J. L.</searchLink><br /><searchLink fieldCode="AR" term="%22Assafin%2C+M%2E%22">Assafin, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Jehin%2C+E%2E%22">Jehin, E.</searchLink><br /><searchLink fieldCode="AR" term="%22Maury%2C+A%2E%22">Maury, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Lellouch%2C+E%2E%22">Lellouch, E.</searchLink><br /><searchLink fieldCode="AR" term="%22Hutton%2C+R%2E+Gil%22">Hutton, R. Gil</searchLink><br /><searchLink fieldCode="AR" term="%22Braga-Ribas%2C+F%2E%22">Braga-Ribas, F.</searchLink><br /><searchLink fieldCode="AR" term="%22Colas%2C+F%2E%22">Colas, F.</searchLink><br /><searchLink fieldCode="AR" term="%22Hestroffer%2C+D%2E%22">Hestroffer, D.</searchLink><br /><searchLink fieldCode="AR" term="%22Lecacheux%2C+J%2E%22">Lecacheux, J.</searchLink><br /><searchLink fieldCode="AR" term="%22Roques%2C+F%2E%22">Roques, F.</searchLink><br /><searchLink fieldCode="AR" term="%22Santos-Sanz%2C+P%2E%22">Santos-Sanz, P.</searchLink><br /><searchLink fieldCode="AR" term="%22Widemann%2C+T%2E%22">Widemann, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Morales%2C+N%2E%22">Morales, N.</searchLink><br /><searchLink fieldCode="AR" term="%22Duffard%2C+R%2E%22">Duffard, R.</searchLink><br /><searchLink fieldCode="AR" term="%22Thirouin%2C+A%2E%22">Thirouin, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Castro-Tirado%2C+A%2E+J%2E%22">Castro-Tirado, A. J.</searchLink><br /><searchLink fieldCode="AR" term="%22Jelínek%2C+M%2E%22">Jelínek, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Kubánek%2C+P%2E%22">Kubánek, P.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Nature%22">Nature</searchLink>. 10/27/2011, Vol. 478 Issue 7370, p493-496. 4p. 1 Diagram, 2 Graphs.
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  Data: 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 cm3 and a high visible geometric albedo, . 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. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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