近地小行星探测器（NEAR）对253 马蒂尔德的飞越探测：一颗C型小行星的图像。

NEAR's flyby of 253 mathilde: images of a C asteroid.

作者信息

Veverka J, Thomas P, Harch A, Clark B, Bell JF, Carcich B, Joseph J, Chapman C, Merline W, Robinson M, Malin M, McFadden LA, Murchie S, Hawkins SE, Farquhar R, Izenberg N, Cheng A

机构信息

J. Veverka, P. Thomas, A. Harch, B. Clark, J. F. Bell III, B. Carcich, J. Joseph, Center for Radiophysics and Space Research, Cornell University, Ithaca, NY 14853, USA. C. Chapman and W. Merline, Southwest Research Institute, 1050 Walnut Str.

出版信息

Science. 1997 Dec 19;278(5346):2109-14. doi: 10.1126/science.278.5346.2109.

DOI:10.1126/science.278.5346.2109

PMID:9405344

Abstract

On 27 June 1997, the Near Earth Asteroid Rendezvous (NEAR) spacecraft flew within 1212 kilometers of asteroid 253 Mathilde. Mathilde is an irregular, heavily cratered body measuring 66 kilometers by 48 kilometers by 46 kilometers. The asteroid's surface is dark (estimated albedo between 0.035 and 0.050) and similar in color to some CM carbonaceous chondrites. No albedo or color variations were detected. The volume derived from the images and the mass from Doppler tracking of the spacecraft yield a mean density of 1.3 +/- 0.2 grams per cubic centimeter, about half that of CM chondrites, indicating a porous interior structure.

摘要

1997年6月27日，近地小行星交会（NEAR）航天器在距离小行星253 Mathilde 1212公里的范围内飞过。Mathilde是一个不规则的、布满大量陨石坑的天体，尺寸为66公里×48公里×46公里。该小行星的表面很暗（估计反照率在0.035至0.050之间），颜色与一些CM碳质球粒陨石相似。未检测到反照率或颜色变化。根据图像得出的体积以及航天器多普勒跟踪得到的质量，得出平均密度为1.3±0.2克每立方厘米，约为CM球粒陨石密度的一半，这表明其内部结构多孔。