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

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.