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The stellar occultation by Makemake on 2011 April 23
Ortiz, J. L.; Sicardy, B.; Assafin, M. et al.
2011In EPSC Abstracts, p. 704
 

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Abstract :
[en] We have taken advantage of a stellar occultation by the dwarf planet Makemake on 2011 April 23, to determine several of its main physical properties. We present results from a multisite campaign with 8 positive occultation detections from 5 different sites, including data from the 8-m VLT and 3.5-m NTT telescopes in Chile, which have very high temporal resolution. Because the star was significantly fainter than Makemake (setting a record in the magnitude of a star whose occultation has been detected), the occultation resulted in a drop of just ~0.3 mag in the lightcurves. From the lightcurves we have been able to determine the size and shape of the body, its geometric albedo and constraints on its atmosphere.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Ortiz, J. L.;  Instituto de Astrofisica de Andalucia-CSIC, Solar System Department, Granada, Spain (ortiz@iaa.es
Sicardy, B.;  Observatório do Valongo / UFRJ, Brazil
Assafin, M.;  European Southern Observatory, Chile
Alvarez-Candal, A.;  European Southern Observatory, Chile
Ivanov, V. D.;  Observatório Nacional / MCT, Brazil
Camargo, J.;  Univ. of Sheffield, UK
Littlefair, S.;  Instituto de Astronomía, Universidad Catolica del Norte, Chile
Unda-Sanzana, E.;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Jehin, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Braga-Ribas, F.;  Centre Hospitalier Universitaire de Liège - CHU > Secteur nettoyage
Lellouch, Emmanuel
Morales, N.
Licandro, J.
Gil-Hutton, R.
Duffard, R.
Colque, J. P.
Tancredi, G.
Manfroid, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Thirouin, A.
Lecacheux, J.
Maury, A.
Colas, F.
Jaques, C.
Weaver, D.
Milone, A.
Salvo, S.
Bruzzone, S.
Organero, F.
Behrend, R.
Vieira-Martins, R.
Widemann, T.
Roques, F.
Santos-Sanz, P.
Hestroffer, D.
More authors (26 more) Less
Language :
English
Title :
The stellar occultation by Makemake on 2011 April 23
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 :
704
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since 12 January 2012

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