A New Mass Determination of (349) Dembowska with Close Encounters

doi:10.3847/1538-3881/ab1843

	A New Mass Determination of (349) Dembowska with Close Encounters
	Li, Fan 1,2; Fu, Yanning1 ; Yuan, Ye 1,3
刊名	ASTRONOMICAL JOURNAL
	2019-05-01
卷号	157 期号:5 页码:5
关键词	astrometry celestial mechanics minor planets, asteroids: individual (349 Dembowska)
ISSN号	0004-6256
DOI	10.3847/1538-3881/ab1843
通讯作者	Li, Fan(lifan@pmo.ac.cn)
英文摘要	(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).
WOS关键词	ASTEROID MASSES ; DENSITY
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000467114100001
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/24698]
专题	中国科学院紫金山天文台
通讯作者	Li, Fan
作者单位	1.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
推荐引用方式 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.