Title

Radar And Photometric Observations And Shape Modeling Of Contact Binary Near-Earth Asteroid (8567) 1996 Hw1

Keywords

Asteroids; Photometry; Radar observations

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. © 2011 Elsevier Inc.

Publication Date

7-1-2011

Publication Title

Icarus

Volume

214

Issue

1

Number of Pages

210-227

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.icarus.2011.02.019

Socpus ID

79959550751 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/79959550751

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