Contact binary asteroid (153201) 2000 WO107: rotation, shape model, and density
Context. The spectral properties and albedo of near-Earth asteroid (153201) 2000 WO<sub>107<sub/> are consistent with a taxonomic type M. This implies that it might have a high metal abundance and higher density. Aims. We combined different methods to investigate the asteroid rotation, d...
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Article (Journal) |
| Lingua: | inglese |
| Pubblicazione: |
October 2025
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| In: |
Astronomy and astrophysics
Year: 2025, Volume: 702, Pages: 1-13 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/202452553 |
| Accesso online: | Verlag, kostenfrei, Volltext: https://doi.org/10.1051/0004-6361/202452553 Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2025/10/aa52553-24/aa52553-24.html 
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| Note sull'autore: | Yurij Krugly, Oleksiy Golubov, Ihor Kyrylenko, Veronika Lipatova, Irina Belskaya, Vasilij Shevchenko, Ivan Slyusarev, Raguli Inasaridze, Shuhrat Ehgamberdiev, Oleksandra Ivanova, Marek Husárik, Sergey Karpov and Daniel Hestroffer |
| Riassunto: | Context. The spectral properties and albedo of near-Earth asteroid (153201) 2000 WO<sub>107<sub/> are consistent with a taxonomic type M. This implies that it might have a high metal abundance and higher density. Aims. We combined different methods to investigate the asteroid rotation, determine its shape, and use it to estimate its density. Methods. We carried out photometric observations of the asteroid during the 2020 apparition. We then created a program to simulate the light curves, and used it within a Markov chain Monte Carlo (MCMC) algorithm to reconstruct the asteroid shape model from the observational data. The Goldstone radar observations of the asteroid were used as an additional constraint on the asteroid model in the MCMC algorithm. The estimated shape and rotation rate of the contact binary were used to compute its density. Results. The photometric observations of (153201) 2000 WO<sub>107<sub/> obtained at a wide range of the phase angles from 5 to 68 degrees in the time interval of November 28 - December 8, 2020, show light curves typical for contact binary asteroids, which agrees with the results of the radar data. The light curves have a maximum amplitude of up to 1.24 mag. The best-fit modeled shape of the asteroid is composed of two ellipsoidal lobes with axes of 0.68 × 0.38 × 0.36 km and 0.44 × 0.42 × 0.16 km. Its sidereal rotation period is determined to be 5.017 ± 0.002 h. The most probable solution for the angular velocity vector of the asteroid indicates ecliptic coordinates of <i>λ<i/> = 96° ± 8° and <i>β<i/> = −78° ± 1°, but another less probable solution of around <i>λ<i/> = 286° ± 11°, <i>β<i/> = −76° ± 2° cannot be disregarded. The estimated density of the asteroid <i>ρ<i/> = 4.80<sub>−0.63<sub/><sup>+0.34<sup/> g/cm<sup>3<sup/> is consistent with a possible metallic composition. From the orbital simulation of this potentially hazardous asteroid, we find that its integral probability of colliding with the Earth in the next 10 000 years is 7 · 10<sup>−5<sup/>. |
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| Descrizione del documento: | Im Titel ist "107" tiefgestellt Gesehen am 01.07.2026 |
| Descrizione fisica: | Online Resource |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/202452553 |