A Close Binary Star Resolved from Occultation by 87 Sylvia
- Creators
- Lin, Chi-Long
- Zhang, Zhi-Wei
- Chen, W. P.
- King, Sun-Kun
- Lin, Hung-Chin
- Wang, J.-H.
- Mondal, S.
- Alcock, C.
- Axelrod, T.
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Bianco, F. B.
- Byun, Y.-I.
- Coehlo, N. K.
- Cook, K. H.
- Dave, R.
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de Pater, I.
- Descamps, P.
- Lehner, M. J.
- Kim, D. W.
- Lee, T.
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Lissauer, J. J.
- Marshall, S. L.
- Porrata, R.
- Protopapas, P.
- Rice, J. A.
- Schwamb, M. E.
- Wang, S.-Y.
- Wen, C.-Y.
Abstract
The star BD +29 1748 was resolved to be a close binary from its occultation by the asteroid 87 Sylvia on 2006 December 18 UT. Four telescopes were used to observe this event at two sites separated by some 80 km. Two flux drops were observed at one site, whereas only one flux drop was detected at the other. From the long-term variation of Sylvia, we inferred the probable shape of the shadow during the occultation, and this in turn constrains the binary parameters: the two components of BD +29 1748 have a projected separation of 0.ʺ097–0.ʺ140 on the sky with a position angle 104°–110°. The asteroid was clearly resolved, with a size scale ranging from 130 to 290 km as projected onto the occultation direction, consistent with the size dimensions 385 × 265 × 230 km, measured by direct adaptive optics imaging. No occultation was detected for either of the two known moonlets of 87 Sylvia.
Additional Information
© 2009 The Astronomical Society of the Pacific. Received 2009 January 12; accepted 2009 March 5; published 2009 May 6. We thank David W. Dunham, Sato Isao, Dave Herald, and Mitsuru Soma for helpful discussions. KHC's work has been performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. We acknowledge the anonymous referee, whose suggestions improved the quality of the paper.Attached Files
Published - Lin2009p4257Publ_Astron_Soc_Pac.pdf
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Additional details
- Eprint ID
- 15613
- Resolver ID
- CaltechAUTHORS:20090904-105651754
- DE-AC52-07NA27344
- Department of Energy (DOE)
- Created
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2009-09-22Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field