[IAUC] CBET 2675: 20110312 : STELLAR OCCULTATION BY TRANSNEPTUNIAN OBJECT (208996) 2003 AZ84
quai en eps.harvard.edu
quai en eps.harvard.edu
Mie Sep 14 16:19:01 ART 2011
Electronic Telegram No. 2675
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director: Daniel W. E. Green; Hoffman Lab 209; Harvard University;
20 Oxford St.; Cambridge, MA 02138; U.S.A.
e-mail: cbatiau en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network
STELLAR OCCULTATION BY TRANSNEPTUNIAN OBJECT (208996) 2003 AZ84
F. Braga-Ribas, B. Sicardy, F. Colas, and J. Lecacheux, Observatoire de
Paris; A. Maury, San Pedro de Atacama Celestial Explorations Observatory
(SPACE); J. L. Ortiz, N. Morales, and I. de la Cueva, Instituto de Astrofisica
de Andalucia (IAA), Granada; E. Jehin, J. Manfroid, and M. Gillon, Institut
d'Astrophysique de l'Universite de Liege; M. Assafin, Observatorio do Valongo,
UFRJ, Rio de Janeiro; and R. Vieira-Martins and J. I. B. Camargo, Observatorio
Nacional, Rio de Janeiro, report on the positive detection of an occultation
of a faint star (magnitude R about 18) by the transneptunian object (208996)
2003 AZ84 on Jan. 8d06h29m59s UT (mid-time), from the SPACE Observatory. The
occultation was recorded by A. Maury with the C. Harlinten 0.5-m Planewave
telescope there, and also by J. L. Ortiz with the remotely operated 0.4-m
ASH2 telescope of the IAA in Spain. E. Jehin and J. Manfroid report that no
drop of the flux was observed with the 0.6-m robotic TRAPPIST telescope of
Liege University, which is located 610 km from San Pedro. Using a
diffracting model, F. Braga-Ribas determined the times of immersion and
emersion of the star. The occultation lasted for 21.7 +/- 0.8 seconds,
corresponding to a chord length of 573 +/- 21 km. This result gives a lower
limit to the diameter of the TNO, and can be compared to the estimated
diameter from Stansberry et al. (2008, *Physical Properties of Kuiper Belt
and Centaur Objects*, University of Arizona Press, pp. 161ff; 685.8 +/- 95.5
km, based on Spitzer data) and Mueller et al. (2010, A.Ap. 518, L146; 910
+/- 60 km, based on Herschel data).
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2011 CBAT
2011 March 12 (CBET 2675) Daniel W. E. Green
Más información sobre la lista de distribución Iauc