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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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.
|Title:||TNOs are Cool: A Survey of the Trans-Neptunian Region III. Thermophysical properties of 90482 Orcus and 136472 Makemake|
|Date:||12 May 2010|
|Journal or Publication Title:||Astronomy and Astrophysics|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|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|
|HGF - Program:||Space|
|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)|
|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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