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

被引：45

作者：

Magri, Christopher ^{[1
]}

Howell, Ellen S. ^{[2
]}

Nolan, Michael C. ^{[2
]}

Taylor, Patrick A. ^{[2
]}

Fernandez, Yanga R. ^{[3
]}

Mueller, Michael ^{[4
]}

Vervack, Ronald J., Jr. ^{[5
]}

Benner, Lance A. M. ^{[6
]}

Giorgini, Jon D. ^{[6
]}

Ostro, Steven J. ^{[6
]}

Scheeres, Daniel J. ^{[7
]}

Hicks, Michael D. ^{[6
]}

Rhoades, Heath ^{[6
]}

Somers, James M. ^{[8
]}

Gaftonyuk, Ninel M. ^{[9
]}

Kouprianov, Vladimir V. ^{[10
]}

Krugly, Yurij N. ^{[11
]}

Molotov, Igor E. ^{[12
]}

Busch, Michael W. ^{[13
]}

Margot, Jean-Luc ^{[13
]}

Benishek, Vladimir ^{[14
]}

Protitch-Benishek, Vojislava ^{[14
]}

Galad, Adrian ^{[15
,16
]}

Higgins, David ^{[17
]}

Kusnirak, Peter ^{[16
]}

Pray, Donald P. ^{[18
]}

机构：

[1] Univ Maine, Farmington, ME 04938 USA

[2] Arecibo Observ, Arecibo, PR 00612 USA

[3] Univ Cent Florida, Dept Phys, Orlando, FL 32828 USA

[4] Univ Nice Sophia Antipolis, CNRS, Observ Cote Azur, F-06304 Nice 4, France

[5] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA

[6] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[7] Univ Colorado, Dept Aerosp Engn Sci, Boulder, CO 80309 USA

[8] Moorpark Coll, Moorpark, CA 93021 USA

[9] Crimean Astrophys Observ, Simeiz Dept, UA-98680 Crimea, Ukraine

[10] Russian Acad Sci, Pulkovo Observ, St Petersburg 196140, Russia

[11] Kharkov Natl Univ, Inst Astron, UA-61022 Kharkov, Ukraine

[12] RAS, MV Keldysh Appl Math Inst, Moscow 125047, Russia

[13] Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USA

[14] Belgrade Astron Observ, Belgrade 11060 38, Serbia

[15] FMFI UK, Dept Astron Phys Earth & Meteorol, Modra Observ, SK-84248 Bratislava, Slovakia

[16] Acad Sci Czech Republic, Astron Inst, CZ-25165 Ondrejov, Czech Republic

[17] Hunters Hill Observ, Canberra, ACT, Australia

[18] Carbuncle Hill Observ, Coventry, RI 02816 USA

来源：

ICARUS | 2011年 / 214卷 / 01期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

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

D O I：

10.1016/j.icarus.2011.02.019

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：210 / 227

页数：18

共 46 条

[1]

BENISHEK V, 2009, MINOR PLANET B, V36, P35

[2] Radar observations of asteroid 2063 Bacchus [J].