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“TNOs are Cool”: A survey of the trans-Neptunian region. VII. Size and surface characteristics of (90377) Sedna and 2010 EK139

Pál, A. and Kiss, C. and Müller, T. G. and Santos-Sanz, P. and Vilenius, E. and Szalai, N. and Mommert, M. and Lellouch, E. and Rengel, M. and Hartogh, P. and Protopapa, S. and Stansberry, J. and Ortiz, J.-L. and Duffard, R. and Thirouin, A. and Henry, F. and Delsanti, A. (2012) “TNOs are Cool”: A survey of the trans-Neptunian region. VII. Size and surface characteristics of (90377) Sedna and 2010 EK139. Astronomy and Astrophysics, 541, L6. DOI: 10.1051/0004-6361/201218874. ISSN 0004-6361.

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Official URL: http://dx.doi.org/10.1051/0004-6361/201218874

Abstract

We present estimates of the basic physical properties (size and albedo) of (90377) Sedna, a prominent member of the detached trans-Neptunian object population and the recently discovered scattered disk object 2010 EK139, based on the recent observations acquired with the Herschel Space Observatory, within the "TNOs are Cool!" key programme. Our modeling of the thermal measurements shows that both objects have larger albedos and smaller sizes than the previous expectations, thus their surfaces might be covered by ices in a significantly larger fraction. The derived diameter of Sedna and 2010 EK139 are 995 ± 80 km and 470+35-10 km, while the respective geometric albedos are pV = 0.32 ± 0.06 and 0.25+0.02-0.05. These estimates are based on thermophysical model techniques.

Document Type:Article
Title:“TNOs are Cool”: A survey of the trans-Neptunian region. VII. Size and surface characteristics of (90377) Sedna and 2010 EK139
Authors:
AuthorsInstitution or Email of Authors
Pál, A.Konkoly Observatory
Kiss, C.Konkoly Observatory
Müller, T. G.MPE Garching
Santos-Sanz, P.Observatoire de Paris-Meudon, France
Vilenius, E.MPE Garching
Szalai, N.Konkoly Observatory
Mommert, M.michael.mommert@dlr.de
Lellouch, E.Observatoire de Paris-Meudon, France
Rengel, M.MPS, Lindau-Katlenburg
Hartogh, P.MPS, Lindau-Katlenburg
Protopapa, S.U. of Maryland
Stansberry, J.U. of Arizona
Ortiz, J.-L.IAA-CSIC Granada, Spain
Duffard, R.IAA-CSIC Granada, Spain
Thirouin, A.IAA-CSIC Granada, Spain
Henry, F.Observatoire de Paris-Meudon, France
Delsanti, A.Lab. d'Astrophysique de Marseille, France
Date:May 2012
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:541
DOI:10.1051/0004-6361/201218874
Page Range:L6
ISSN:0004-6361
Status:Published
Keywords:Kuiper belt objects: individual: (90377) Sedna, radiation mechanisms: thermal, techniques: photometric, Kuiper belt objects: individual: 2010 EK139
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Exploration des Sonnensystems (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Michael Mommert
Deposited On:24 Oct 2012 08:30
Last Modified:04 Apr 2013 16:38

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