Photometry of selected outer main belt asteroids. (August 2021)

• Record Type: Journal Article
• Authors: Shevchenko, V.G.; Mikhalchenko, O.I.; Belskaya, I.N.; Slyusarev, I.G.; Chiorny, V.G.; Krugly, Yu N.; Hromakina, T.A.; Dovgopol, A.N.; Kiselev, N.N.; Rublevsky, A.N.; Antonyuk, K.А.; Novichonok, A.O.; Kusakin, A.V.; Reva, I.V.; Inasaridze, R.Ya; Ayvazian, V.V.; Kapanadze, G.V.; Molotov, I.E.; Oszkiewicz, D.; Kwiatkowski, T.
• Is Part Of: Planetary and space science. Volume 202(2021)
• Publication Date: 2021-08
• Subjects: Asteroids -- Rotation -- Photometry -- Spectrophotometry; Space sciences -- Periodicals; Atmosphere, Upper -- Periodicals; Sciences spatiales -- Périodiques; Haute atmosphère -- Périodiques; 523
• DOI: 10.1016/j.pss.2021.105248
• Languages: English
• ISSNs: 0032-0633

Abstract

Abstract: We present new photometric observations for twelve asteroids ((122) Gerda, (152) Atala, (260) Huberta, (665) Sabine, (692) Hippodamia, (723) Hammonia, (745) Mauritia, (768) Struveana, (863) Benkoela, (1113) Katja, (1175) Margo (2057) Rosemary) from the outer part of the main belt aimed to obtain the magnitude-phase curves and to verify geometric albedo and taxonomic class based on their magnitude-phase behaviors. The measured magnitude-phase relations confirm previously determined composition types of (260) Huberta (C-type), (692) Hippodamia (S-type) and (1175) Margo (S-type). Asteroids (665) Sabine and (768) Struveana previously classified as X-type show phase-curve behavior typical for moderate-albedo asteroids and may belong to the M-type. The phase-curve of (723) Hammonia is typical for the S-type which contradicts the previously determined C-type. We confirmed the moderate-albedo of asteroids (122) Gerda and (152) Atala, but their phase-curves are different from typical for the S-type and may indicate more rare compositional types. Based on magnitude-phase behaviors and V-R colors, (2057) Rosemary most probably belongs to M-type, while asteroids (745) Mauritia and (1113) Katja belong to S-complex. The phase curve of the A-type asteroid (863) Benkoela does not cover the opposition effect range and further observations are needed to understand typical features of the phase-curves of A-type asteroids in comparison with other types. We have also determined lightcurve amplitudes of the observed asteroids and obtained new or improved values of the rotation periods for most of them. Highlights: New photometric observations for twelve outer belt asteroids were performed and the magnitude-phase curves were obtained. We made estimations of geometric albedo and composition type of the observed asteroids using their magnitude-phase curves. Most part of moderate albedo asteroids from our set have surface properties different from typical for the S-type and may indicate more rare compositional types. Part of moderatealbedo asteroids from our set have properties different from S-type and may indicate more rare types.