Io Voyager - Galileo Global Mosaic Rotation Animation
- Originators
- USGS Astrogeology Science Center
- Publisher
- USGS Astrogeology Science Center
- Abstract
- This basemap of Jupiterâs moon Io was produced by combining the best images from both the Voyager 1 and Galileo Missions. Although the subjovian hemisphere of Io was poorly seen by Galileo, superbly detailed Voyager 1 images cover longitudes from 240ËW to 40ËW and the nearby southern latitudes. A monochrome mosaic of the highest resolution images from both Galileo and Voyager 1 was assembled that includes 29 Voyager 1 images with spatial resolutions sometimes exceeding the 1 km/pixel scale of the final mosaic. Because this mosaic is made up of images taken at various local times of day, care must be taken to note the solar illumination direction when deciding whether topographic features display positive or negative relief. In general, the illumination is from the west over longitudes 40 to 270 W, and from the east over longitudes 270 W to 40 W. Color information was later superimposed from Galileo low phase angle violet, green, and near-infrared (756 nanometer wavelength) images. The Galileo SSI cameraâs silicon CCD was sensitive to longer wavelengths than the vidicon cameras of Voyager, so that distinctions between red and yellow hues can be more easily discerned. The âtrueâ colors that would be visible to the eye are similar but much more muted than shown here. Image resolutions range from 1 to 10 km/pixel along the equator, with the poorest coverage centered on longitude 50 W.
Contact and Distribution
- Format
- Global Mosaic
- Access Scope
- Native Data Set Environment
- Astrogeology Theme
- Geographic Information System (GIS), Image Processing
- Mission Names
- Galileo, Voyager
- Instrument Names
- SSI
- Online Package Link
- https://astrogeology.usgs.gov/search/map/io_voyager_galileo_global_mosaic_rotation_animation
- External File Size
- 3461191
- Online File Link
- http://astropedia.astrogeology.usgs.gov/download/Io/Voyager-Galileo/Io_rotation_movie_m2v4_2rots.mpg
- Contact Address
- 2255 N. Gemini Drive
- Contact City
- Flagstaff
- Contact State
- AZ
- Contact Postal Code
- 86001
- Contact Email
- astroweb@usgs.gov
Geospatial Information
- Target
- Io
- System
- Jupiter
- Object Type
- Grid Cell
- Quad Name
- Horizontal Coordinate System Units
- Degrees
