Occultation-based Size and Shape of (269) Justitia

• DOI: 10.3847/psj/adb28c
• Publication Date: 2025-03-19T18:12:04Z
• Authors: Marc W. Buie; Hoor حور AlMazmi ...; Paul Hayne; Anna Marciniak; Brian A. Keeney; Fahad فهد Alawadh...; Alia علياء Almans...; Noora Rashed Alsaeed; Amer Sarhan عامر ...; Arvind Jayashanka...; Dahlia Baker; Samuel F. A. Cart...; Elad David; Hugh M. Davidson; Ian Faber; Chelsea Ferrell; William Goodwyn F...; Kai Getrost; Julian Hammerl; Parker Hinton; Jack L. Jewell; Roxanne L. Kamin; John Keller; Mykal Lefevre; Steve Messner; Vadim Nikitin; Heshani Pieris; Arunima Prakash; Julien Salmon; Abdullah Essa Sharif; Michael Skrutskie; Kya C. Sorli; Thibaud تيبو Teil...; Anne J Verbiscer; Jacopo Villa
• Keywords: Albedo; Main belt asteroids; Astronomy; QB1-991; Astrometry; Asteroid occultation

Abstract We present results from an occultation of a star by the asteroid (269) Justitia on 2023 August 31 UT using a deployment of 34 stations. Of the deployed stations, 29 were successful in collecting useful data and 19 recorded a positive occultation event. All stations were regularly spaced 2.45 km apart in the cross-track direction to cover ±3σ of the ephemeris uncertainty with a planning diameter of 59 km. We find that the shape of Justitia is irregular, with large-scale facets and a circular-equivalent radius in the range of 28.5–28.9 km. The inferred albedo is p

V = 0.072 ± 0.007 using a rotation-corrected absolute magnitude of H

V = 9.72. Astrometry from the occultation is provided.