The Trans-Neptunian Object (84922) 2003 VS<SUB>2</SUB> through Stellar Occultations

DOI: 
10.3847/1538-3881/ab3b05
Publication date: 
01/10/2019
Main author: 
Benedetti-Rossi, Gustavo
IAA authors: 
Santos-Sanz, P.;Ortiz, J. L.;Morales, N.;Duffard, R.
Authors: 
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.;Lecacheux, J.;Maury, A.;Melia, R.;Moindrot, S.;Morgado, B.;Opitom, C.;Peyrot, A.;Pollock, J.;Pratt, A.;Roland, S.;Spagnotto, J.;Tancredi, G.;Teng, J. -P.;Cacella, P.;Emilio, M.;Feys, F.;Gil-Hutton, R.;Jacques, C.;Machado, D. I.;Malacarne, M.;Manulis, I.;Milone, A. C.;Rojas, G.;Sfair, R.
Journal: 
The Astronomical Journal
Refereed: 
Yes
Publication type: 
Article
Volume: 
158
Pages: 
159
Abstract: 
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.
Database: 
ADS
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85080149396&doi=10.3847%2f1538-3881%2fab3b05&partnerID=40&md5=edf6ea0ec0d48e42bc317cd9e409a7c0
ADS Bibcode: 
2019AJ....158..159B
Keywords: 
Kuiper Belt;Astrophysics - Earth and Planetary Astrophysics