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Radar and photometric observations and shape modeling of contact binary near-Earth Asteroid (8567) 1996 HW1

Authors :
Daniel J. Scheeres
Donald P. Pray
V. Protitch-Benishek
James M. Somers
Michael Mueller
Patrick A. Taylor
Michael W. Busch
Jean-Luc Margot
Jon D. Giorgini
Steven J. Ostro
Yanga R. Fernandez
Adrian Galad
Michael C. Nolan
Yurij N. Krugly
Michael D. Hicks
David Higgins
Ellen S. Howell
Ronald J. Vervack
Vladimir Kouprianov
Igor Molotov
Peter Kusnirak
Christopher Magri
H. Rhoades
N. M. Gaftonyuk
Lance A. M. Benner
Vladimir Benishek
Source :
Icarus. 214:210-227
Publication Year :
2011
Publisher :
Elsevier BV, 2011.

Abstract

We observed near-Earth Asteroid (8567) 1996 HW1 at the Arecibo Observatory on six dates in September 2008, obtaining radar images and spectra. By combining these data with an extensive set of new lightcurves taken during 2008–2009 and with previously published lightcurves from 2005, we were able to reconstruct the object’s shape and spin state. 1996 HW1 is an elongated, bifurcated object with maximum diameters of 3.8 × 1.6 × 1.5 km and a contact-binary shape. It is the most bifurcated near-Earth asteroid yet studied and one of the most elongated as well. The sidereal rotation period is 8.76243 ± 0.00004 h and the pole direction is within 5° of ecliptic longitude and latitude (281°, −31°). Radar astrometry has reduced the orbital element uncertainties by 27% relative to the a priori orbit solution that was based on a half-century of optical data. Simple dynamical arguments are used to demonstrate that this asteroid could have originated as a binary system that tidally decayed and merged.

Details

ISSN :
00191035
Volume :
214
Database :
OpenAIRE
Journal :
Icarus
Accession number :
edsair.doi...........f5de6581db403b85812be6d9f95d6da5
Full Text :
https://doi.org/10.1016/j.icarus.2011.02.019