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TNOs are Cool: A Survey of the Trans-Neptunian Region III. Thermophysical properties of 90482 Orcus and 136472 Makemake

Lim, Tanya and Stansberry, John and Müller, Thomas and Mueller, Michael and Lellouch, Emmanuel and Kiss, Csaba and Santos Sanz, Pablo and Vilenius, Esa and Protopapa, Silvia and Moreno, Raphael and Delsanti, Audrey and Duffard, René D. and Fornasier, Sonia and Groussin, Olivier and Harris, Alan W. and Henry, Florence and Horner, Jonathan and Lacerda, Pedro and Mommert, Michael and Ortiz Moreno, Jose Luis and Rengel, Miriam and Thirouin, Audrey and Trilling, David and Barucci, Antonella and Crovisier, Jacques and Doressoundiram, Alain and Dotto, Elisabetta and Gutierrez Buenestado, Pedro and Hainaut, Olivier and Hartogh, Paul and Hestroffer, Daniel and Kidger, Mark and Lara López, Luisa M. and Swinyard, Bruce and Thomas, Nicolas (2010) TNOs are Cool: A Survey of the Trans-Neptunian Region III. Thermophysical properties of 90482 Orcus and 136472 Makemake. Astronomy and Astrophysics, 518 (L148). EDP Sciences. DOI: 10.1051/0004-6361/201014701.

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Official URL: http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201014701&Itemid=129

Abstract

Context. The goal of the Herschel open time programme “TNOs are Cool!” is to derive the physical and thermal properties for a large sample of Centaurs, and trans-Neptunian objects (TNOs), including resonant, classical, detached and scattered disk objects. Aims. Based on observations of two targets we tried (i) to optimise the SPIRE observing technique for faint (close to the background confusion noise), slowly moving targets; (ii) to test different thermal model techniques; (iii) to determine radiometric diameter and albedo values; (iv) to compare with Spitzer results whenever possible. Methods. We obtained SPIRE photometry on two targets and PACS photometry on one of the targets. Results. We present results for the two targets, (90482) Orcus and (136472) Makemake, observed with SPIRE and for one of those targets, Makemake, observed with PACS. We adopt pV = 0.27 and D = 850 km as our best estimate of the albedo and diameter of Orcus using single terrain models. With two-terrain models for Makemake, the bright terrain is fitted by, 0.78 < pV < 0.90, and the dark terrain 0.02 < pV < 0.12, giving 1360 < D < 1480 km. Conclusions. A single terrain model was derived for Orcus through the SPIRE photometry combined with MIPS data. The Makemake data from MIPS, PACS and SPIRE combined are not compatible with a single terrain model, but can be modelled with a two-terrain fit. These science demonstration observations have shown that the scanning technique, which allows us to judge the influence of background structures, has proved to be a good basis for this key programme.

Document Type:Article
Title:TNOs are Cool: A Survey of the Trans-Neptunian Region III. Thermophysical properties of 90482 Orcus and 136472 Makemake
Authors:
AuthorsInstitution or Email of Authors
Lim, TanyaRAL Didcot, UK
Stansberry, JohnUniversity of Arizona, USA
Müller, ThomasMPI für Extraterrestrische Physik, Germany
Mueller, MichaelObservatoire de la Côte d'Azur
Lellouch, EmmanuelObservatoire de Paris-Meudon, France
Kiss, CsabaKonkoly Observatory, Hungary
Santos Sanz, PabloObservatoire de Paris, France
Vilenius, EsaMPI für Extraterrestrische Physik, Germany
Protopapa, SilviaMPI für Sonnensystemforschung, Germany
Moreno, RaphaelObservatoire de Paris-Meudon, France
Delsanti, AudreyLab. d'Astrophysique de Marseille, France
Duffard, René D.IAA-CSIC Granada, Spain
Fornasier, SoniaObservatoire de Paris-Meudon, France
Groussin, OlivierLab. d'Astrophysique de Marseille, France
Harris, Alan W.alan.harris@dlr.de
Henry, FlorenceObservatoire de Paris-Meudon, France
Horner, JonathanOpen University, Milton Keynes, UK
Lacerda, PedroQueen's University Belfast
Mommert, Michaelmichael.mommert@dlr.de
Ortiz Moreno, Jose LuisIAA-CSIC Granada, Spain
Rengel, MiriamMPI für Sonnensystemforschung, Germany
Thirouin, AudreyIAA-CSIC Granada, Spain
Trilling, DavidNorthern Arizona University, USA
Barucci, AntonellaObservatoire de Paris-Meudon, France
Crovisier, JacquesObservatoire de Paris-Meudon, France
Doressoundiram, AlainObservatoire de Paris-Meudon, France
Dotto, ElisabettaOsservatorio Astronomico di Roma, Italy
Gutierrez Buenestado, PedroIAA-CSIC Granada, Spain
Hainaut, OlivierESO
Hartogh, PaulMPI für Sonnensystemforschung, Germany
Hestroffer, DanielObservatoire de Paris, France
Kidger, MarkESAC, Villafranca del Castillo, Spain
Lara López, Luisa M.IAA-CSIC Granada, Spain
Swinyard, BruceRAL Didcot, UK
Thomas, NicolasUniversity of Bern, Switzerland
Date:12 May 2010
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:518
DOI:10.1051/0004-6361/201014701
Publisher:EDP Sciences
Status:Published
Keywords:techniques: photometric / Kuiper belt objects: individual: 90482 Orcus / Kuiper belt objects: individual: 136472 Makemake / infrared: general / submillimeter: general
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 Asteroiden und Kometen (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Michael Mommert
Deposited On:13 Oct 2010 12:37
Last Modified:26 Mar 2013 13:19

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