Title

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

Authors

Authors

C. Magri; E. S. Howell; M. C. Nolan; P. A. Taylor; Y. R. Fernandez; M. Mueller; R. J. Vervack; L. A. M. Benner; J. D. Giorgini; S. J. Ostro; D. J. Scheeres; M. D. Hicks; H. Rhoades; J. M. Somers; N. M. Gaftonyuk; V. V. Kouprianov; Y. N. Krugly; I. E. Molotov; M. W. Busch; J. L. Margot; V. Benishek; V. Protitch-Benishek; A. Galad; D. Higgins; P. Kusnirak;D. P. Pray

Comments

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Abbreviated Journal Title

Icarus

Keywords

Asteroids; Photometry; Radar observations; 4769 CASTALIA; LIGHTCURVE INVERSION; OPTIMIZATION METHODS; PHYSICAL; MODEL; YORP; POPULATION; EVOLUTION; ITOKAWA; IMAGES; KW4; Astronomy & Astrophysics

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 x 1.6 x 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 50 of ecliptic longitude and latitude (281 degrees, -31 degrees). 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. (C) 2011 Elsevier Inc. All rights reserved.

Journal Title

Icarus

Volume

214

Issue/Number

1

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

210

Last Page

227

WOS Identifier

WOS:000292853600015

ISSN

0019-1035

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