GALILEO ENCOUNTER WITH 951 GASPRA - 1ST PICTURES OF AN ASTEROID

被引：182

作者：

BELTON, MJS

VEVERKA, J

THOMAS, P

HELFENSTEIN, P

SIMONELLI, D

CHAPMAN, C

DAVIES, ME

GREELEY, R

GREENBERG, R

HEAD, J

MURCHIE, S

KLAASEN, K

JOHNSON, TV

MCEWEN, A

MORRISON, D

NEUKUM, G

FANALE, F

ANGER, C

CARR, M

PILCHER, C

机构：

[1] CORNELL UNIV,DEPT ASTRON,ITHACA,NY 14853

[2] NATL OPT ASTRON OBSERV,TUCSON,AZ 85719

[3] PLANETARY SCI INST,TUCSON,AZ 85719

[4] RAND CORP,SANTA MONICA,CA 90406

[5] ARIZONA STATE UNIV,DEPT GEOL,TEMPE,AZ 85287

[6] UNIV ARIZONA,LUNAR & PLANETARY LAB,TUCSON,AZ 85721

[7] BROWN UNIV,DEPT GEOL,PROVIDENCE,RI 02912

[8] JET PROP LAB,PASADENA,CA 91109

[9] US GEOL SURVEY,FLAGSTAFF,AZ 86001

[10] NASA,AMES RES CTR,MOFFETT FIELD,CA 94035

[11] NASA HEADQUARTERS,WASHINGTON,DC 20546

[12] DFVLR,W-8031 OBERPFAFFENHOFEN,GERMANY

[13] UNIV HAWAII,INST GEOPHYS,HONOLULU,HI 96822

[14] INST SPACE & TERR SCI,CONCORD L4K 3C8,ONTARIO,CANADA

[15] US GEOL SURVEY,MENLO PK,CA 94025

来源：

SCIENCE | 1992年 / 257卷 / 5077期

关键词：

D O I：

10.1126/science.257.5077.1647

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Galileo images of Gaspra reveal it to be an irregularly shaped object (19 by 12 by 11 kilometers) that appears to have been created by a catastrophic collisional disruption of a precursor parent body. The cratering age of the surface is about 200 million years. Subtle albedo and color variations appear to correlate with morphological features: Brighter materials are associated with craters especially along the crests of ridges, have a stronger 1-micrometer absorption, and may represent freshly excavated mafic materials; darker materials exhibiting a significantly weaker 1-micrometer absorption appear concentrated in interridge areas. One explanation of these patterns is that Gaspra is covered with a thin regolith and that some of this material has migrated downslope in some areas.

引用

页码：1647 / 1652

页数：6

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[1] LUNAR AND MARTIAN SURFACES - PETROLOGIC SIGNIFICANCE OF ABSORPTION BANDS IN NEAR-INFRARED [J].