A Caltech Library Service

Ground-Based Near-Infrared Imaging Observations of Venus During the Galileo Encounter

Crisp, D. and McMuldroch, S. and Stephens, S. K. and Sinton, W. M. and Ragent, B. and Hodapp, K. W. and Probst, R. G. and Doyle, L. R. and Allen, D. A. and Elias, J. (1991) Ground-Based Near-Infrared Imaging Observations of Venus During the Galileo Encounter. Science, 253 (5027). pp. 1538-1541. ISSN 0036-8075. doi:10.1126/science.253.5027.1538.

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item:


Near-infrared images of Venus, obtained from a global network of ground-based observatories during January and February 1990, document the morphology and motions of the night-side near-infrared markings before, during, and after the Galileo Venus encounter. A dark cloud extended halfway around the planet at low latitudes (>±40°) and persisted throughout the observing program. It had a rotation period of 5.5 ± 0.15 days. The remainder of this latitude band was characterized by small-scale (400 to 1000 kilometers) dark and bright markings with rotation periods of 7.4 ± 1 days. The different rotation periods for the large dark cloud and the smaller markings suggests that they are produced at different altitudes. Mid-latitudes (±40° to 60°) were usually occupied by bright east-west bands. The highest observable latitudes (±60° to 70°) were always dark and featureless, indicating greater cloud opacity. Maps of the water vapor distribution show no evidence for large horizontal gradients in the lower atmosphere of Venus.

Item Type:Article
Related URLs:
URLURL TypeDescription
Crisp, D.0000-0002-4573-9998
Hodapp, K. W.0000-0003-0786-2140
Additional Information:© 1991 American Association for the Advancement of Science. 3 April 1991; Accepted 17 July 1991. This work was funded in part by grants from the NASA Planetary Astronomy and Planetary Atmospheres Programs to the Jet Propulsion Laboratory (JPL), California Institute of Technology, and the NASA Ames Research Center. Additional support for S. McMuldroch was provided by the Science and Engineering Research Council. Computer time was provided by the Wide-Field/Planetary Camera II Project at JPL. Contribution 5067 from the Division of Geological and Planetary Sciences, California Institute of Technology.
Funding AgencyGrant Number
Science and Engineering Research Council (SERC)UNSPECIFIED
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences5067
Issue or Number:5027
Record Number:CaltechAUTHORS:20150107-122328736
Persistent URL:
Official Citation:CRISP, D., MCMULDROCH, S., STEPHENS, S. K., SINTON, W. M., RAGENT, B., HODAPP, K.-W., . . . ELIAS, J. (1991). Ground-Based Near-Infrared Imaging Observations of Venus During the Galileo Encounter. Science, 253(5027), 1538-1541. doi: 10.1126/science.253.5027.1538
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53272
Deposited On:09 Jan 2015 16:46
Last Modified:10 Nov 2021 19:50

Repository Staff Only: item control page