S
S. Roland
Researcher at University of the Republic
Publications - 12
Citations - 608
S. Roland is an academic researcher from University of the Republic. The author has contributed to research in topics: Equivalent width & Solar System. The author has an hindex of 7, co-authored 12 publications receiving 550 citations.
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Journal ArticleDOI
A ring system detected around the centaur (10199) chariklo
Felipe Braga-Ribas,Bruno Sicardy,Jose Luis Ortiz,Colin Snodgrass,F. Roques,R. Vieira-Martins,R. Vieira-Martins,R. Vieira-Martins,Julio Camargo,Marcelo Assafin,Rene Duffard,Emmanuel Jehin,Joe Pollock,Rodrigo Leiva,Marcelo Emilio,D. I. Machado,C. Colazo,E. Lellouch,Jesper Skottfelt,Jesper Skottfelt,Michaël Gillon,N. Ligier,L. Maquet,G. Benedetti-Rossi,A. Ramos Gomes,Pierre Kervella,Hektor Monteiro,Rafael Sfair,M. El Moutamid,M. El Moutamid,Gonzalo Tancredi,J. Spagnotto,Alain Maury,Nicolás Morales,Ricardo Gil-Hutton,S. Roland,A. Ceretta,Shenghong Gu,Xuefeng Wang,Kasper Harpsøe,Kasper Harpsøe,Markus Rabus,Markus Rabus,Jean Manfroid,Cyrielle Opitom,L. Vanzi,L. Mehret,L. Lorenzini,E. M. Schneiter,R. Melia,J. Lecacheux,François Colas,Frédéric Vachier,Thomas Widemann,L. Almenares,R. G. Sandness,F. Char,V. Perez,P. Lemos,Nicolás Marín Martínez,U. G. Jørgensen,U. G. Jørgensen,Martin Dominik,Fernando Roig,Daniel E. Reichart,Aaron P. LaCluyze,J. B. Haislip,K. M. Ivarsen,J. P. Moore,N. R. Frank,D. G. Lambas,D. G. Lambas +71 more
TL;DR: Observations of a multichord stellar occultation revealed the presence of a ring system around (10199) Chariklo, which is a Centaur—that is, one of a class of small objects orbiting primarily between Jupiter and Neptune—with an equivalent radius of 124 9 kilometres.
Journal ArticleDOI
Albedo and atmospheric constraints of dwarf planet Makemake from a stellar occultation
Jose Luis Ortiz,Bruno Sicardy,Felipe Braga-Ribas,Alvaro Alvarez-Candal,Emmanuel Lellouch,Rene Duffard,Noemi Pinilla-Alonso,Valentin D. Ivanov,S. P. Littlefair,Julio Camargo,Marcelo Assafin,Eduardo Unda-Sanzana,Emmanuel Jehin,Nicolás Morales,Gonzalo Tancredi,Ricardo Gil-Hutton,I. de la Cueva,J. P. Colque,D. N. da Silva Neto,Jean Manfroid,Audrey Thirouin,P. J. Gutiérrez,J. Lecacheux,Michaël Gillon,Alain Maury,François Colas,Javier Licandro,T. G. Mueller,C. Jacques,D. Weaver,A. Milone,R. Salvo,Sebastian Bruzzone,F. Organero,Raoul Behrend,S. Roland,R. Vieira-Martins,Thomas Widemann,F. Roques,Pablo Santos-Sanz,Daniel Hestroffer,V. S. Dhillon,T. R. Marsh,C. Harlingten,A. Campo Bagatin,M.L. Alonso,M. Ortiz,C. Colazo,H. J. F. Lima,Alexandre S. Oliveira,Leandro Kerber,Rodolfo Smiljanic,E. Pimentel,Breno L. Giacchini,P. Cacella,Marcelo Emilio +55 more
TL;DR: The disappearances and reappearances of the star were abrupt, showing that Makemake has no global Pluto-like atmosphere at an upper limit of 4–12 nanobar (1σ) for the surface pressure, although a localized atmosphere is possible.
Journal ArticleDOI
The size, shape, albedo, density, and atmospheric limit of transneptunian object (50000) quaoar from multi-chord stellar occultations
Felipe Braga-Ribas,Bruno Sicardy,Jose Luis Ortiz,Emmanuel Lellouch,Gonzalo Tancredi,Jean Lecacheux,R. Vieira-Martins,Julio Camargo,Marcelo Assafin,Raoul Behrend,Frédéric Vachier,François Colas,Nicolás Morales,Alain Maury,Marcelo Emilio,A. Amorim,Eduardo Unda-Sanzana,S. Roland,Sebastian Bruzzone,Leonardo A. Almeida,Claudia V. Rodrigues,C. Jacques,Ricardo Gil-Hutton,L. Vanzi,A. Milone,William Schoenell,William Schoenell,R. Salvo,L. Almenares,Emmanuel Jehin,Jean Manfroid,S. Sposetti,Paolo Tanga,Alain Klotz,E. Frappa,P. Cacella,J. P. Colque,C. Neves,Estrella Álvarez,Michaël Gillon,E. Pimentel,Breno L. Giacchini,Françoise Roques,Thomas Widemann,V. S. Magalhães,Audrey Thirouin,Rene Duffard,Rodrigo Leiva,Ignacio Toledo,J. Capeche,W. Beisker,Joe Pollock,C. E. Cedeño Montaña,K. M. Ivarsen,Daniel E. Reichart,J. B. Haislip,Aaron P. LaCluyze +56 more
TL;DR: Braga Ribas et al. as discussed by the authors proposed a method to improve the quality of the data collected by the data collection system of the government of Brazil, using data from the Ministerio de Ciencia, Tecnologia e Innovacao.
Journal ArticleDOI
Distribution of boulders and the gravity potential on asteroid Itokawa
TL;DR: In this article, the authors analyzed images taken at different surface resolution and configurations corresponding to several regions on the asteroid Itokawa and found that the size distribution is correlated with the total potential and the surface gravity.
Journal ArticleDOI
The Structure of Chariklo’s Rings from Stellar Occultations
D. Bérard,Bruno Sicardy,Julio Camargo,Josselin Desmars,Felipe Braga-Ribas,J. L. Ortiz,Rene Duffard,Nicolás Morales,E. Meza,Rodrigo Leiva,G. Benedetti-Rossi,R. Vieira-Martins,A.-R. Gomes Júnior,Marcelo Assafin,François Colas,Jean-Luc Dauvergne,Pierre Kervella,J. Lecacheux,L. Maquet,Frédéric Vachier,S. Renner,B. Monard,A. A. Sickafoose,H. Breytenbach,Anja Genade,W. Beisker,K. L. Bath,H.-J. Bode,Michael Backes,Valentin D. Ivanov,Emmanuel Jehin,Michaël Gillon,Jean Manfroid,Joe Pollock,Gonzalo Tancredi,S. Roland,R. Salvo,L. Vanzi,Dave Herald,D. Gault,S. Kerr,H. Pavlov,K. M. Hill,J. Bradshaw,M. A. Barry,A. Cool,B. Lade,Andrew A. Cole,J. Broughton,J. Newman,R. Horvat,D. Maybour,D. Giles,L. Davis,R. A. Paton,B. Loader,A. Pennell,P. D. Jaquiery,Stephane Brillant,Fernando Selman,Christophe Dumas,C. Herrera,Giovanni Carraro,Lorenzo Monaco,Alain Maury,A. Peyrot,J.-P. Teng-Chuen-Yu,A. Richichi,Puji Irawati,C. De Witt,P. Schoenau,R. Prager,C. Colazo,R. Melia,J. Spagnotto,A. Blain,S. Alonso,A. Román,Pablo Santos-Sanz,J. L. Rizos,J. L. Maestre,D. Dunham +81 more
TL;DR: In this paper, the authors used 12 successful occulations by Chariklo observed between 2014 and 2016 to provide ring profiles (physical width, opacity, edge structure) and constraints on the radii and pole position.