Asteroid absolute magnitudes and phase curve parameters from Gaia photometry | |
Martikainen, J.3,4; Muinonen, K.4,5; Penttilä, A.4; Cellino, A.1; Wang XB(王晓彬)2,6 | |
刊名 | Astronomy and Astrophysics |
2021-05-01 | |
卷号 | 649 |
关键词 | minor planets, asteroids: general methods: numerical techniques: photometric |
ISSN号 | 0004-6361 |
DOI | 10.1051/0004-6361/202039796 |
产权排序 | 第5完成单位 |
文献子类 | Journal article (JA) |
英文摘要 | Aims. We perform light curve inversion for 491 asteroids to retrieve phase curve parameters, rotation periods, pole longitudes and latitudes, and convex and triaxial ellipsoid shapes by using the sparse photometric observations from Gaia Data Release 2 and the dense ground-based observations from the DAMIT database. We develop a method for the derivation of reference absolute magnitudes and phase curves from the Gaia data, allowing for comparative studies involving hundreds of asteroids. Methods. For both general convex shapes and ellipsoid shapes, we computed least-squares solutions using either the Levenberg-Marquardt optimization algorithm or the Nelder-Mead downhill simplex method. Virtual observations were generated by adding Gaussian random errors to the observations, and, later on, a Markov chain Monte Carlo method was applied to sample the spin, shape, and scattering parameters. Absolute magnitude and phase curve retrieval was developed for the reference geometry of equatorial illumination and observations based on model magnitudes averaged over rotational phase. Results. The derived photometric slope values showed wide variations within each assumed Tholen class. The computed Gaia G-band absolute magnitudes matched notably well with the V-band absolute magnitudes retrieved from the Jet Propulsion Laboratory Small-Body Database. Finally, the reference phase curves were well fitted with the H, G1, G2 phase function. The resulting G1, G2 distribution differed, in an intriguing way, from the G1, G2 distribution that is based on the phase curves corresponding to light curve brightness maxima. |
学科主题 | 天文学 ; 天体物理学 ; 实测天体物理学 ; 太阳与太阳系 |
URL标识 | 查看原文 |
语种 | 英语 |
出版者 | EDP Sciences |
内容类型 | 期刊论文 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/24347] |
专题 | 云南天文台_系外行星研究组 |
作者单位 | 1.INAF, Osservatorio Astrofisico di Torino, Via Osservatorio 20, Pino Torinese, 10025, Italy 2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing, 100049, China 3.Nordic Optical Telescope (NOT), Apartado 474, Santa Cruz de La Palma, 38700, Spain 4.Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2, U. Helsinki, 00014, Finland 5.Finnish Geospatial Research Institute FGI, Geodeetinrinne 2, Masala, 02430, Finland 6.Yunnan Observatories, CAS, Kunming, 650216, China |
推荐引用方式 GB/T 7714 | Martikainen, J.,Muinonen, K.,Penttilä, A.,et al. Asteroid absolute magnitudes and phase curve parameters from Gaia photometry[J]. Astronomy and Astrophysics,2021,649. |
APA | Martikainen, J.,Muinonen, K.,Penttilä, A.,Cellino, A.,&Wang XB.(2021).Asteroid absolute magnitudes and phase curve parameters from Gaia photometry.Astronomy and Astrophysics,649. |
MLA | Martikainen, J.,et al."Asteroid absolute magnitudes and phase curve parameters from Gaia photometry".Astronomy and Astrophysics 649(2021). |
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