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A Single-chord Stellar Occultation by the Extreme Trans-Neptunian Object (541132) Leleākūhonua

2020; Institute of Physics; Volume: 159; Issue: 5 Linguagem: Inglês

10.3847/1538-3881/ab8630

1538-3881

M. W. Buie, Rodrigo Leiva, John M. Keller, J. Desmars, B. Sicardy, J. J. Kavelaars, Terry Bridges, R. Weryk, D. Herald, Sean L. Haley, Ryder Strauss, Elizabeth Wilde, Robert Baker, Ken Conway, Bryan Dean, M. L. Dunham, James J. Estes, Naemi Fiechter, Rima Givot, Cameron Glibbery, B. Gowe, Jennifer N. Hayman, Olivia L Ireland, Matthew Kehrli, Erik M. Moore, Matthew A. MacDonald, Delsie McCrystal, Paola Mendoza, Bruce Palmquist, Sherry Rennau, Ramsey Schar, D. Swanson, Emma D. Terris, Holly Werts, J. A. Wise,

Stellar, planetary, and galactic studies

Abstract A stellar occultation by the extreme large-perihelion trans-Neptunian object (541132) Leleākūhonua (also known by the provisional designation of 2015 TG 387 ) was predicted by the Lucky Star project and observed with the Research and Education Collaborative Occultation Network on 2018 October 20 UT. A single detection and a nearby nondetection provide constraints for the size and albedo. When a circular profile is assumed, the radius is <?CDATA $r={110}_{-10}^{+14}$?> km, corresponding to a geometric albedo <?CDATA ${p}_{V}={0.21}_{-0.05}^{+0.03}$?> , for an adopted absolute magnitude of H V = 5.6, typical of other objects in dynamically similar orbits. The occultation also provides a high-precision astrometric constraint.