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A New Mass Determination of (349) Dembowska with Close Encounters
Li, Fan1,2; Fu, Yanning1; Yuan, Ye1,3
2019-05-01
Source PublicationASTRONOMICAL JOURNAL
ISSN0004-6256
Volume157Issue:5Pages:5
Corresponding AuthorLi, Fan(lifan@pmo.ac.cn)
Abstract(349) Dembowska is a big R-type main-belt asteroid. A new and more precise determination of its mass, M, is presented. The high precision is achieved, in particular, using our generally applied criterion of selecting model parameters. This criterion takes into account the sensitivity to M of the available observables, i.e., the position of another much smaller body involved in a close encounter with (349) Dembowska. Using this criterion, as well as observations from the Minor Planet Center (MPC) and the ephemeris DE431, M is redetermined to be (4.1 +/- 0.4) x 10(18) kg, which is a weighted mean of compatible masses independently determined with five encounters. From the most recently determined effective diameter, we get a bulk density of rho = 2.08 +/- 0.24 g cm(-3) for (349) Dembowska. A macroporosity of 36 is derived from a grain density of 3.25 g cm(-3).
Keywordastrometry celestial mechanics minor planets, asteroids: individual (349 Dembowska)
DOI10.3847/1538-3881/ab1843
WOS KeywordASTEROID MASSES ; DENSITY
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000467114100001
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/24699
Collection中国科学院紫金山天文台
Corresponding AuthorLi, Fan
Affiliation1.Chinese Acad Sci, Purple Mt Observ, 2West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
3.Univ Sci & Technol China, 96 JinZhai Rd Baohe Dist, Hefei 230026, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Li, Fan,Fu, Yanning,Yuan, Ye. A New Mass Determination of (349) Dembowska with Close Encounters[J]. ASTRONOMICAL JOURNAL,2019,157(5):5.
APA Li, Fan,Fu, Yanning,&Yuan, Ye.(2019).A New Mass Determination of (349) Dembowska with Close Encounters.ASTRONOMICAL JOURNAL,157(5),5.
MLA Li, Fan,et al."A New Mass Determination of (349) Dembowska with Close Encounters".ASTRONOMICAL JOURNAL 157.5(2019):5.
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