Article (Scientific journals)
The Trans-Neptunian Object (84922) 2003 VS[SUB]2[/SUB] through Stellar Occultations
Benedetti-Rossi, Gustavo; Santos-Sanz, P.; Ortiz, J. L. et al.
2019In Astronomical Journal, 158
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Keywords :
Kuiper Belt; Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] We present results from three world-wide campaigns that resulted in the detections of two single-chord and one multi-chord stellar occultations by the plutino object (84922) 2003 VS[SUB]2[/SUB]. From the single-chord occultations in 2013 and 2014 we obtained accurate astrometric positions for the object, while from the multi-chord occultation on 2014 November 7, we obtained the parameters of the best-fitting ellipse to the limb of the body at the time of occultation. We also obtained short-term photometry data for the body in order to derive its rotational phase during the occultation. The rotational light curve present a peak-to- peak amplitude of 0.141 ± 0.009 mag. This allows us to reconstruct the 3D shape of the body, with principal semi-axes of a = 313.8 ± 7.1 km, b={265.5}[SUB]-9.8[/SUB][SUP]+8.8[/SUP] km, and c={247.3}[SUB]-43.6[/SUB][SUP]+26.6[/SUP] km, which is not consistent with a Jacobi triaxial equilibrium figure. The derived spherical volume equivalent diameter of {548.3}[SUB]-44.6[/SUB][SUP]+29.5[/SUP] km is about 5% larger than the radiometric diameter of 2003 VS[SUB]2[/SUB] derived from Herschel data of 523 ± 35 km, but still compatible with it within error bars. From those results we can also derive the geometric albedo ({0.123}[SUB]-0.014[/SUB][SUP]+0.015[/SUP]) and, under the assumption that the object is a Maclaurin spheroid, the density ρ ={1400}[SUB]-300[/SUB][SUP]+1000[/SUP] for the plutino. The disappearances and reappearances of the star during the occultations do not show any compelling evidence for a global atmosphere considering a pressure upper limit of about 1 microbar for a pure nitrogen atmosphere, nor secondary features (e.g., rings or satellite) around the main body.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Benedetti-Rossi, Gustavo;  Observatório Nacional (ON/MCTIC), Rua Gal. José Cristino, 77—Bairro Imperial de São Cristóvão, Rio de Janeiro, Brazil ; Laboratório Interinstitucional de e-Astronomia (LIneA) & INCT do e-Universo, Rio de Janeiro, Brazil ; LESIA, Observatoire de Paris—Section Meudon, 5 Place Jules Janssen—92195 Meudon Cedex, France
Santos-Sanz, P.;  Instituto de Astrofísica de Andalucía, IAA-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain
Ortiz, J. L.;  Instituto de Astrofísica de Andalucía, IAA-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain
Assafin, M.;  Observatório do Valongo/UFRJ, Ladeira Pedro Antonio 43, Rio de Janeiro, 20080-090, Brazil
Sicardy, B.;  LESIA, Observatoire de Paris—Section Meudon, 5 Place Jules Janssen—92195 Meudon Cedex, France ; PSL Research University, CNRS, Sorbonne Université, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, France
Morales, N.;  Instituto de Astrofísica de Andalucía, IAA-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain
Vieira-Martins, R.;  Observatório Nacional (ON/MCTIC), Rua Gal. José Cristino, 77—Bairro Imperial de São Cristóvão, Rio de Janeiro, Brazil ; Laboratório Interinstitucional de e-Astronomia (LIneA) & INCT do e-Universo, Rio de Janeiro, Brazil ; IMCCE/Observatoire de Paris, CNRS UMR F-8028, Paris, France
Duffard, R.;  Instituto de Astrofísica de Andalucía, IAA-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain
Braga-Ribas, F.;  Observatório Nacional (ON/MCTIC), Rua Gal. José Cristino, 77—Bairro Imperial de São Cristóvão, Rio de Janeiro, Brazil ; Laboratório Interinstitucional de e-Astronomia (LIneA) & INCT do e-Universo, Rio de Janeiro, Brazil ; LESIA, Observatoire de Paris—Section Meudon, 5 Place Jules Janssen—92195 Meudon Cedex, France ; Federal University of Technology—Paraná (UTFPR/DAFIS), Av. Sete de Setembro, 3165, CEP 80230-901, Curitiba/PR, Brazil
Rommel, F. L.;  Observatório Nacional (ON/MCTIC), Rua Gal. José Cristino, 77—Bairro Imperial de São Cristóvão, Rio de Janeiro, Brazil ; Laboratório Interinstitucional de e-Astronomia (LIneA) & INCT do e-Universo, Rio de Janeiro, Brazil
Camargo, J. I. B.;  Observatório Nacional (ON/MCTIC), Rua Gal. José Cristino, 77—Bairro Imperial de São Cristóvão, Rio de Janeiro, Brazil ; Laboratório Interinstitucional de e-Astronomia (LIneA) & INCT do e-Universo, Rio de Janeiro, Brazil
Desmars, Josselin;  LESIA, Observatoire de Paris—Section Meudon, 5 Place Jules Janssen—92195 Meudon Cedex, France
Colas, A. F.;  IMCCE/Observatoire de Paris, CNRS UMR F-8028, Paris, France
Vachier, F.;  IMCCE/Observatoire de Paris, CNRS UMR F-8028, Paris, France
Alvarez-Candal, A.;  Observatório Nacional (ON/MCTIC), Rua Gal. José Cristino, 77—Bairro Imperial de São Cristóvão, Rio de Janeiro, Brazil
Fernández-Valenzuela, E.;  Florida Space Institute, University of Central Florida, 12354 Research Parkway, Partnership 1, Suite 211, Orlando, FL, USA
Almenares, L.;  Departamento de Astronomía, Facultad de Ciencias, Montevideo, Uruguay
Artola, R.;  Estación Astrofísica de Bosque Alegre, Cordoba, Argentina
Baum, T.-P.;  Observatoire Astronomique des Makes, Les Makes, F-97421—La Rivière, Ile de la Réunion, France
Behrend, R.;  Observatoire de Genève, CH-1290 Sauverny, Switzerland
Bérard, D.;  LESIA, Observatoire de Paris—Section Meudon, 5 Place Jules Janssen—92195 Meudon Cedex, France
Bianco, F. B.;  University of Delaware, Department of Physics and Astronomy, USA ; University of Delaware, Joseph R. Biden Jr. School for Public Policy and Administration, USA ; University of Delaware, Data Science Institute, USA ; New York University, Center for Urban Science and Progress, USA
Brosch, N.;  School of Physics & Astronomy and Wise Observatory, Tel Aviv University, Israel
Ceretta, A.;  Observatorio Astronómico Los Molinos, MEC, Uruguay
Colazo, C. A.;  Estación Astrofísica de Bosque Alegre, Cordoba, Argentina
Gomes-Junior, A. R.;  Laboratório Interinstitucional de e-Astronomia (LIneA) & INCT do e-Universo, Rio de Janeiro, Brazil ; UNESP—São Paulo State University, Grupo de Dinâmica Orbital e Planetologia, CEP 12516-410, Guaratinguetá, SP, Brazil
Ivanov, V. D.;  ESO, Karl-Schwarzschild-Str. 2, D-85748 Garching bei München, Germany
Jehin, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Kaspi, S.;  School of Physics & Astronomy and Wise Observatory, Tel Aviv University, Israel
Lecacheux, J.;  LESIA, Observatoire de Paris—Section Meudon, 5 Place Jules Janssen—92195 Meudon Cedex, France
Maury, A.;  San Pedro de Atacama Celestial Explorations, Casilla 21, San Pedro de Atacama 1410000, Chile
Melia, R.;  Estación Astrofísica de Bosque Alegre, Cordoba, Argentina
Moindrot, S.;  Observatoire de Puimichel, F-04700—Puimichel, France
Morgado, B.;  Observatório Nacional (ON/MCTIC), Rua Gal. José Cristino, 77—Bairro Imperial de São Cristóvão, Rio de Janeiro, Brazil ; Laboratório Interinstitucional de e-Astronomia (LIneA) & INCT do e-Universo, Rio de Janeiro, Brazil
Opitom, C.;  European Southern Observatory—Alonso de Cordova 3107, Vitacura, Santiago, Chile
Peyrot, A.;  Observatoire Astronomique des Makes, Les Makes, F-97421—La Rivière, Ile de la Réunion, France
Pollock, J.;  Physics and Astronomy Department, Appalachian State University, Boone, NC 28608, USA
Pratt, A.;  IOTA/ES—International Occultation Timing Association/European Section, Germany
Roland, S.;  CURE, Universidad de la Republica, Uruguay
Spagnotto, J.;  Observatorio El Catalejo, Santa Rosa, La Pampa, Argentina
Tancredi, G.;  Departamento de Astronomía, Facultad de Ciencias, Montevideo, Uruguay
Teng, J.-P.;  Observatoire Astronomique des Makes, Les Makes, F-97421—La Rivière, Ile de la Réunion, France
Cacella, P.;  DogsHeaven Observatory X87, Brasília, Brazil
Emilio, M.;  Observatório Nacional (ON/MCTIC), Rua Gal. José Cristino, 77—Bairro Imperial de São Cristóvão, Rio de Janeiro, Brazil ; Universidade Estadual de Ponta Grossa, O.A.—DEGEO, Avenida Carlos Cavalcanti 4748, Ponta Grossa 84030-900, PR, Brazil
Feys, F.;  IOTA/ES—International Occultation Timing Association/European Section, Germany
Gil-Hutton, R.;  Grupo de Ciencias Planetarias, Departamento de Geofísica y Astronomía, San Juan National University and CONICET, Av. José I. de la Roza 590(0), J5402DCS, San Juan, Argentina
Machado, D. I.;  Universidade Estadual do Oeste do Paraná (Unioeste), Avenida Tarquínio Joslin dos Santos 1300, Foz do Iguaçu, PR 85870-650, Brazil ; Polo Astronômico Casimiro Montenegro Filho/FPTI-BR, Avenida Tancredo Neves 6731, Foz do Iguaçu, PR 85867-900, Brazil
Malacarne, M.;  Universidade Federal do Espírito Santo (UFES), Brazil
Manulis, I.;  Weizmann Institute of Science, Rehovot, Israel
Milone, A. C.;  Astrophysics Division, National Institute for Space Research (INPE), Av. dos Astronautas 1758, São José dos Campos, SP, 12227-010, Brazil
Rojas, G.;  Observatório Astronômico—Universidade Federal de São Carlos (UFSCar), São Carlos, Brazil
Sfair, R.;  UNESP—São Paulo State University, Grupo de Dinâmica Orbital e Planetologia, CEP 12516-410, Guaratinguetá, SP, Brazil)
More authors (43 more) Less
Language :
English
Title :
The Trans-Neptunian Object (84922) 2003 VS[SUB]2[/SUB] through Stellar Occultations
Publication date :
01 October 2019
Journal title :
Astronomical Journal
ISSN :
0004-6256
eISSN :
1538-3881
Publisher :
American Astronomical Society, United States
Volume :
158
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
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