%0 Journal Article %1 BELTON1992a %A BELTON, M. J. S. %A VEVERKA, J. %A THOMAS, P. %A HELFENSTEIN, P. %A SIMONELLI, D. %A CHAPMAN, C. %A DAVIES, M. E. %A Greeley, R. %A Greenberg, R. %A HEAD, J. %A MURCHIE, S. %A KLAASEN, K. %A JOHNSON, T. V. %A MCEWEN, A. %A MORRISON, D. %A NEUKUM, G. %A FANALE, F. %A ANGER, C. %A CARR, M. %A PILCHER, C. %D 1992 %J Science %K imported %N 5077 %P 1647--1652 %T GALILEO ENCOUNTER WITH 951 GASPRA1ST PICTURES OF AN ASTEROID %V 257 %X 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.

@article{BELTON1992a, abstract = {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.}, added-at = {2009-11-03T20:21:25.000+0100}, author = {BELTON, M. J. S. and VEVERKA, J. and THOMAS, P. and HELFENSTEIN, P. and SIMONELLI, D. and CHAPMAN, C. and DAVIES, M. E. and Greeley, R. and Greenberg, R. and HEAD, J. and MURCHIE, S. and KLAASEN, K. and JOHNSON, T. V. and MCEWEN, A. and MORRISON, D. and NEUKUM, G. and FANALE, F. and ANGER, C. and CARR, M. and PILCHER, C.}, biburl = {https://www.bibsonomy.org/bibtex/21c994feb11b5352514aa9e34b8e7fa17/svance}, citedreferences = {ADAMS JB, 1968, Science, V159, P1453 ; ANDERSON JD, COMMUNICATION ; AUSPHANG E, 1991, LUNAR PLANET SCI, V23, P43 ; BELTON MJS, IN PRESS SPACE SCI R ; BRITT DT, 1990, LUNAR PLANET SCI, V21, P127 ; CELLINO A, IN PRESS MONTHLY NOT ; CHAPMAN CR, IN PRESS LUNAR PLANE ; CHAPMAN CR, J GEOPHYS RES, V46, P1445 ; CHAPMAN CR, 1968, Icarus, V46, P337 ; CHAPMAN CR, 1975, Icarus, V25, P104 ; CHAPMAN CR, 1979, ASTEROIDS, P25 ; CHAPMAN CR, 1991, ASTEROIDS COMETS MET ; CLOUTIS EA, 1990, J GEOPHYS RES, V95, P8233 ; DIMARTINO M, 1990, Icarus, V87, P372 ; DOHNANYI JS, 1971, NASA, P263 ; EGAN WG, 1973, Icarus, V19, P358 ; FARINELLA P, IN PRESS ASTRON ASTR ; FARINELLA P, 1991, LUNAR PLANET SCI, V22, P363 ; FRENCH LM, 1983, Icarus, V54, P38 ; GAFFEY MJ, 1974, THESIS MIT CAMBRIDGE ; GAFFEY MJ, 1984, Icarus, V60, P83 ; GAFFEY MJ, 1989, ASTEROIDS, V2, P98 ; GOLDADER JD, 1991, ASTRON J, V102, P1503 ; GOLDADER JD, 1991, B AM ASTRON SOC, V23, P1142 ; GRADIE J, 1989, ASTEROIDS, V2, P316 ; HAMILTON DP, 1991, Icarus, V92, P118 ; HARRIS A, COMMUNICATION ; HOUSEN KR, COMMUNICATION ; HOUSEN KR, 1979, Icarus, V39, P317 ; HOUSEN KR, 1992, LUNAR PLANET SCI, V23, P555 ; JOHNSON TV, 1973, Icarus, V18, P612 ; MAGNUSSON P, IN PRESS Icarus ; MATSON DL, 1977, P LUNAR PLANET SCI C, V8, P1001 ; MCCORD TB, 1972, J GEOPHYS RES, V77, P1349 ; MILLIS RL, 1989, ASTEROIDS, V2, P148 ; MOTTOLA S, UNPUB ; MOTTOLA S, 1991, PREPRINT ; MURCHIE SL, 1991, J GEOPHYS RES-SOLID, V96, P5925 ; NAMIKI N, 1991, GEOPHYS RES LETT, V18, P1155 ; NEUKUM G, 1975, MOON, V12, P201 ; NEUKUM G, 1975, P LUNAR PLANET SCI C, V6, P2597 ; SODERBLOM LA, J GEOPHYS RES, V75, P2655 ; SPENCER J, COMMUNICATION ; THOLEN DJ, 1989, ASTEROIDS, V2, P298 ; THOMAS P, 1979, Icarus, V40, P223 ; THOMAS P, 1979, Icarus, V40, P394 ; THOMAS P, 1979, J GEOPHYS RES, V84, P8457 ; THOMAS P, 1980, Icarus, V42, P234 ; THOMAS P, 1986, SATELLITES, P802 ; THOMAS PC, 1989, Icarus, V77, P248 ; VEVERKA J, 1982, ASTEROIDS, P628 ; VEVERKA J, 1986, SATELLITES, P342 ; WETHERILL GW, 1967, J GEOPHYS RES, V72, P2429 ; WISNIEWSKI W, COMMUNICATION ; ZELLNER B, 1985, Icarus, V61, P355}, interhash = {bbdd042248968c03519c2a2effb8eda0}, intrahash = {1c994feb11b5352514aa9e34b8e7fa17}, journal = {Science}, keywords = {imported}, number = 5077, owner = {svance}, pages = {1647--1652}, timestamp = {2009-11-03T20:21:39.000+0100}, title = {GALILEO ENCOUNTER WITH 951 GASPRA1ST PICTURES OF AN ASTEROID}, volume = 257, year = 1992 }