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Stellar Occultations by TNOs: the January 08, 2011 by (208996) 2003 AZ84 and the May 04, 2011 by (50000) Quaoar
Braga-Ribas, F.; Sicardy, B.; Ortiz, J. L. et al.
2011In EPSC Abstracts, p. 1060
 

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Abstract :
[en] Between February 2010 and May 2011, our group has observed five stellar occultations by Trans-Neptunian Objects (TNOs), giving the size and shape for some of the biggest TNO's: Varuna, Eris, 2003 AZ84, Makemake and Quaoar. Here we present two of them: the January 08 stellar occultation by 2003 AZ84, and the May 04 by Quaoar. For the event of 2003 AZ84 we obtained one positive and another negative occultation chords in Chile. We give a lower limit to the diameter of the TNO. The event of Quaoar was observed from 16 sites distributed in Uruguay, Argentina, Chile and Brazil. Five of them yielded positive detection of the occultation. A preliminary analysis shows that the body is probably elongated and significantly bigger than the size determined by Fraser & Brown 2010, with a diameter of 890km. Using the size determined by the occultation, we will discuss the implications for the body density and albedo determination. The upper limit of the atmosphere is also studied.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Braga-Ribas, F.;  Observatoire de Pairs-Meudon, LESIA / IMCCE, Meudon, France (felipe.ribas@obspm.fr)(ribas@on.br) ; Observatório Nacional/MCT, Brazil
Sicardy, B.;  Instituto de Astrofísica de Andalucía, Spain
Ortiz, J. L.;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Jehin, Emmanuel  ;  Observatório Nacional/MCT, Brazil
Camargo, J. I. B.;  Observatório do Valongo/UFRJ, Brazil
Assafin, M.;  Observatoire de Genève, Switzerland
Behrend, R.;  Instituto de Astronomía, Universidad Católica del Norte, Antofagasta, Chile
Unda-Sanzana, E.;  Instituto de Astronomía, Universidad Católica del Norte, Antofagasta, Chile
Colque, J. P.;  Centre Hospitalier Universitaire de Liège - CHU > Secteur nettoyage
Morales, N.;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Tancredi, G.;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Bruzzone, S.
Salvo, R.
Almenares, L.
Emilio, M.
Schoenell, W.
Gil-Hutton, R.
Milone, A.
Jacques, C.
Vanzi, L.
Kavelaars, J. J.
Cacella, P.
Maury, A.
Alvarez, E.
van der Bliek, N. S.
Vieira-Martins, R.
Colas, F.
Lecacheux, J.
Vachier, F.
Roques, F.
Widemann, T.
Thirouin, A.
Bergengruen, A.
Martinez, M.
Capeche, J.
Amorim, A.
Pimentel, E.
Leiva, R.
Toledo, I.
Almeida, L. A.
Magalhães, V. S.
Montaña, C. E.
Rodrigues, C. V.
More authors (36 more) Less
Language :
English
Title :
Stellar Occultations by TNOs: the January 08, 2011 by (208996) 2003 AZ84 and the May 04, 2011 by (50000) Quaoar
Publication date :
01 October 2011
Event name :
EPSC-DPS Joint Meeting 2011
Event date :
2-7 October 2011
Audience :
International
Journal title :
EPSC Abstracts
Pages :
1060
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