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Stellar occultation by (119951) 2002 KX14 on April 26, 2012

Alvarez-Candal, A. and Ortiz, J. L. and Morales, N. and Jiménez-Teja, Y. and Duffard, R. and Sicardy, B. and Dhillon, V. S. and Marsh, T. and Littlefair, S. and Mottola, S. and Hellmich, S. and Shahbaz, T. (2014) Stellar occultation by (119951) 2002 KX14 on April 26, 2012. Astronomy & Astrophysics, 571, A48. EDP Sciences. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361/201424648

Abstract

Context. Trans-Neptunian objects (TNOs) are important bodies, but very little is known about their basic physical properties such as size, density, and albedo. Aims. We intend to determine sizes, albedos, and even densities of a good sample of TNOs, especially those of the largest TNOs because they can be studied the best with different observational techniques. Methods. We took advantage of a stellar occultation by (119951) 2002 KX14 to obtain valuable information by means of high temporal resolution CCD imaging using ULTRACAM at the 4.2 m William Herschel Telescope on La Palma (Spain). Results. Thanks to the high time resolution of ULTRACAM and the large aperture provided by the telescope, we recorded the most accurate chord ever obtained for an occultation by a TNO, with a length of 415 ± 1 km. This is a lower limit to the diameter of (119951) 2002 KX14 assuming that it has a spherical shape. For ellipsoidal objects we developed a method for obtaining equivalent diameters by combining single-chord occultations and accurate astrometry at the time of occultation. By applying this method to (119951) 2002 KX14, we estimate an equal-area equivalent diameter of at least 365+30 −21 km. A possible upper limit is 455 ± 27 km, obtained via thermal data. No atmosphere is detected.We obtain a surface temperature higher than 40 K, which precludes the existence of ices, other than water ice, upon the surface, which is consistent with the featureless spectrum of (119951) 2002 KX14. There are no secondary occultation events that could reveal whether there is a ring system, as recently found for the Centaur (10199) Chariklo.

Item URL in elib:https://elib.dlr.de/91716/
Document Type:Article
Title:Stellar occultation by (119951) 2002 KX14 on April 26, 2012
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Alvarez-Candal, A.ESOUNSPECIFIED
Ortiz, J. L.IAA-CSIC Granada, SpainUNSPECIFIED
Morales, N.Instituto de Astrofısica de AndalucıaUNSPECIFIED
Jiménez-Teja, Y.IAA-CSIC, Granada, SpainUNSPECIFIED
Duffard, R.IAA-CSIC, Granada, SpainUNSPECIFIED
Sicardy, B.Observatoire de Paris, Meudon, FranceUNSPECIFIED
Dhillon, V. S.Department of Physics and Astronomy, University of Sheffield, Sheffield UKUNSPECIFIED
Marsh, T.Department of Physics, University of Warwick, Coventry UKUNSPECIFIED
Littlefair, S.Department of Physics and Astronomy, University of Sheffield, Sheffield UKUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.deUNSPECIFIED
Hellmich, S.stephan.hellmich (at) dlr.deUNSPECIFIED
Shahbaz, T.Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, SpainUNSPECIFIED
Date:2014
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:571
Page Range:A48
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:methods: analytical – techniques: photometric – occultations – Kuiper belt objects: individual: (119951) 2002 KX14 –methods: observational
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Mottola, Dr.phys. Stefano
Deposited On:19 Nov 2014 09:01
Last Modified:08 Mar 2018 18:22

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