文章基本信息

标题：A New Mass Determination of (349) Dembowska with Close Encounters
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作者：Fan Li ; Yanning Fu ; Ye Yuan 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2019
卷号：157
期号：5
页码：1-5
DOI：10.3847/1538-3881/ab1843
语种：English
出版社：American Institute of Physics
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)×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 ρ =2.08±0.24gcm −3 for (349) Dembowska. A macroporosity of 36 is derived from a grain density of 3.25gcm −3 .
关键词：astrometry;celestial mechanics;minor planets, asteroids: individual (349 Dembowska)