A radar survey of M- and X-class asteroids

被引：70

作者：

Shepard, Michael K. ^{[1
]}

Clark, Beth Ellen ^{[2
]}

Nolan, Michael C. ^{[3
]}

Howell, Ellen S. ^{[3
]}

Magri, Christopher ^{[4
]}

Giorgini, Jon D. ^{[5
]}

Benner, Lance A. M.

Ostro, Steven J.

Harris, Alan W. ^{[6
]}

Warner, Brian ^{[7
]}

Pray, Donald ^{[8
]}

Pravec, Petr ^{[9
]}

Fauerbach, Michael ^{[10
]}

Bennett, Thomas

Klotz, Alain ^{[11
]}

Behrend, Raoul ^{[12
]}

Correia, Horacio

Coloma, Josep ^{[13
]}

Casulli, Silvano ^{[14
]}

Rivkin, Andrew ^{[15
]}

机构：

[1] Bloomsburg Univ Penn, Dep Geog & Geosci, Bloomsburg, PA 17815 USA

[2] Ithaca Coll, Ithaca, NY 14853 USA

[3] NAIC, Arecibo Observ, Arecibo, PR 00612 USA

[4] Univ Maine, Farmington, ME 04938 USA

[5] Jet Propuls Lab, Pasadena, CA 91109 USA

[6] Space Sci Inst, La Canada Flintridge, CA 91011 USA

[7] Space Sci Inst, Palmer Divide Observ, Colorado Springs, CO USA

[8] Carbuncle Hill Observ, Greene, RI USA

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

[10] Florida Gulf Coast Univ, Ft Myers, FL 33965 USA

[11] Observ Haute Provence, TAROT, St Micheal Lobservatorie, St Michel, France

[12] Ctr Astron, TAROT, St Micheal Lobservatorie, St Michel, France

[13] Agrupac Astron Sabadell, Barcelona, Spain

[14] Observ Astron Vallemare Borbona, Rome, Italy

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

来源：

ICARUS | 2008年 / 195卷 / 01期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

asteroids; composition; surfaces;

D O I：

10.1016/j.icarus.2007.11.032

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We observed ten M- and X-class main-belt asteroids with the Arecibo Observatory's S-band (12.6 cm) radar. The X-class asteroids were targeted based on their albedos or other properties which suggested they might be M-class. This work brings the total number of main-belt M-class asteroids observed with radar to 14. We find that three of these asteroids have rotation rates significantly different from what was previously reported. Based on their high radar albedo, we find that only four of the fourteen-16 Psyche, 216 Kleopatra, 758 Mancunia, and 785 Zwetana-are almost certainly metallic. 129 Antigone has a moderately high radar albedo and we suggest it may be a CH/CB/Bencubbinite parent body. Three other asteroids, 97 Klotho, 224 Oceana, and 796 Sarita have radar albedos significantly higher than the average main belt asteroid and we cannot rule out a significant metal content for them. Five of our target asteroids, 16 Psyche, 129 Antigone, 135 Hertha, 758 Mancunia, and 785 Zwetana, show variations in their radar albedo with rotation. We can rule out shape and composition in most cases, leaving variations in thickness, porosity, or surface toughness of the regolith to be the most likely causes. With the exception of 129 Antigone, we find no hydrated M-class asteroids (W-class; Rivkin, A.S., Howell, E.S., Lebofsky, L.A., Clark, B.E., Britt, D.T., 2000. Icarus 145, 351-368) to have high radar albedos. (C) 2008 Elsevier Inc. All rights reserved.

引用

页码：184 / 205

页数：22

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