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Title:
"TNOs are Cool": A survey of the trans-Neptunian region. VII. Size and surface characteristics of (90377) Sedna and 2010 EK139
Authors:
Pál, A.; Kiss, C.; Müller, T. G.; Santos-Sanz, P.; Vilenius, E.; Szalai, N.; Mommert, M.; Lellouch, E.; Rengel, M.; Hartogh, P.; Protopapa, S.; Stansberry, J.; Ortiz, J.-L.; Duffard, R.; Thirouin, A.; Henry, F.; Delsanti, A.
Affiliation:
AA(Konkoly Observatory, MTA Research Centre for Astronomy and Earth Sciences, Konkoly-Thege Miklós út 15-17, 1121, Budapest, Hungary ; Department of Astronomy, Loránd Eötvös University, Pázmány Péter sétány 1/A, 1117, Budapest, Hungary), AB(Konkoly Observatory, MTA Research Centre for Astronomy and Earth Sciences, Konkoly-Thege Miklós út 15-17, 1121, Budapest, Hungary), AC(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, Giessenbachstr., 85741, Garching, Germany), AD(LESIA-Observatoire de Paris, CNRS, UPMC Univ. Paris 06, Univ. Paris-Diderot, 5 place J. Janssen, 92195, Meudon Cedex, France), AE(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, Giessenbachstr., 85741, Garching, Germany), AF(Konkoly Observatory, MTA Research Centre for Astronomy and Earth Sciences, Konkoly-Thege Miklós út 15-17, 1121, Budapest, Hungary), AG(Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, Rutherfordstrasse 2, 12489, Berlin, Germany), AH(LESIA-Observatoire de Paris, CNRS, UPMC Univ. Paris 06, Univ. Paris-Diderot, 5 place J. Janssen, 92195, Meudon Cedex, France), AI(Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Strasse 2, 37191, Katlenburg-Lindau, Germany), AJ(Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Strasse 2, 37191, Katlenburg-Lindau, Germany), AK(Department of Astronomy, University of Maryland, College Park, MD, 20742-2421, USA; Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Strasse 2, 37191, Katlenburg-Lindau, Germany), AL(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ, 85721, USA), AM(Instituto de Astrofísica de Andalucía - CSIC, Apt 3004, 18008, Granada, Spain), AN(Instituto de Astrofísica de Andalucía - CSIC, Apt 3004, 18008, Granada, Spain), AO(Instituto de Astrofísica de Andalucía - CSIC, Apt 3004, 18008, Granada, Spain), AP(LESIA-Observatoire de Paris, CNRS, UPMC Univ. Paris 06, Univ. Paris-Diderot, 5 place J. Janssen, 92195, Meudon Cedex, France), AQ(LESIA-Observatoire de Paris, CNRS, UPMC Univ. Paris 06, Univ. Paris-Diderot, 5 place J. Janssen, 92195, Meudon Cedex, France; Laboratoire d'Astrophysique de Marseille, CNRS & Université de Provence, 38 rue Frédéric Joliot-Curie, 13388, Marseille Cedex 13, France)
Publication:
Astronomy & Astrophysics, Volume 541, id.L6, 4 pp. (A&A Homepage)
Publication Date:
05/2012
Origin:
EDP Sciences
Astronomy Keywords:
Kuiper belt objects: individual: (90377) Sedna, radiation mechanisms: thermal, techniques: photometric, Kuiper belt objects: individual: 2010 EK139
DOI:
10.1051/0004-6361/201218874
Bibliographic Code:
2012A&A...541L...6P

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.

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