Artículo
The Trans-Neptunian Object (84922) 2003 VS2 through Stellar Occultations
Benedetti Rossi, Gustavo; Santos Sanz, P.; Ortiz, J. L.; Assafin, M.; Sicardy, B.; Morales, N.; Vieira Martins, R.; Duffard, R.; Braga Ribas, F.; Rommel, F. L.; Camargo, J. I. B.; Desmars, J.; Colas, A. F.; Vachier, F.; Alvarez Candal, A.; Fernández Valenzuela, E.; Almenares, L.; Artola, R.; Baum, T. P.; Behrend, R.; Bérard, D.; Bianco, F. B.; Brosch, N.; Ceretta, A.; Colazo, C. A.; Gomes Junior, A. R.; Ivanov, V. D.; Jehin, E.; Kaspi, S.; Gil Hutton, Ricardo Alfredo
Fecha de publicación:
10/2019
Editorial:
IOP Publishing
Revista:
Astronomical Journal
ISSN:
0004-6256
e-ISSN:
1538-3881
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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 VS2. 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 9.8 8.8 km, and = - + c 247.3 43.6 26.6 km, which is not consistent with a Jacobi triaxial equilibrium figure. The derived spherical volume equivalent diameter of - + 548.3 44.6 29.5 km is about 5% larger than the radiometric diameter of 2003 VS2 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 0.014 0.015) and, under the assumption that the object is a Maclaurin spheroid, the density r = - + 1400 300 1000 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.
Palabras clave:
TRANS-NEPTUNIAN OBJECTS
,
KUIPER BELT
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CCT - SAN JUAN)
Articulos de CENTRO CIENTIFICO TECNOLOGICO CONICET - SAN JUAN
Articulos de CENTRO CIENTIFICO TECNOLOGICO CONICET - SAN JUAN
Citación
Benedetti Rossi, Gustavo; Santos Sanz, P.; Ortiz, J. L.; Assafin, M.; Sicardy, B.; et al.; The Trans-Neptunian Object (84922) 2003 VS2 through Stellar Occultations; IOP Publishing; Astronomical Journal; 158; 4; 10-2019; 1-17
Compartir
Altmétricas