A NASA Discovery mission to conduct the first orbital study
of the innermost planet
NASA logo carnegie institution logo JHU APL logo

Why Mercury?
The Mission
News Center
Science Operations
Who We Are
Related Links

Download iPhone/iPad app Explore orbital data with quickmap Question and Answer End of Orbit Insertion Where is MESSENGER? Where is Mercury now? Subscribe to MESSENGER eNews

A Swiftly Non-Tilting Planet
Click on image to enlarge.
A Swiftly Non-Tilting Planet
Release Date: June 17, 2011
Topics: Global Views, Limb Images, Terminator Views,

Date acquired: May 24, 2011
Image Mission Elapsed Time (MET): 214697100
Image ID: 290398
Instrument: Wide Angle Camera (WAC) of the Mercury Dual Imaging System (MDIS)
WAC filter: 7 (748 nanometers)
Center Latitude: -58.74°
Center Longitude: 273.9° E
Resolution: 2836 meters/pixel
Scale: Mercury's diameter is 4880 km (3032 miles).

Of Interest: This image was taken with the Wide Angle Camera (WAC) and shows part of Mercury's southern hemisphere, taken from the far south, looking north. (The companion image, showing the rest of the southern hemisphere, can be found here.) Unlike Earth (referred to in the title of Madeleine L'Engle's book A Swiftly Tilting Planet), Mercury has a very small axial tilt of only about .02 degrees--the smallest in the Solar System. As a result, Mercury has no seasons.

This image was acquired as part of MDIS's limb imaging campaign. Once per week, MDIS captures images of Mercury's limb, with an emphasis on imaging the southern hemisphere limb. These limb images provide information about Mercury's shape and complement measurements of topography made by the Mercury Laser Altimeter (MLA) of Mercury's northern hemisphere.

The MESSENGER spacecraft is the first ever to orbit the planet Mercury, and the spacecraft's seven scientific instruments and radio science investigation are unraveling the history and evolution of the Solar System's innermost planet. Visit the Why Mercury? section of this website to learn more about the key science questions that the MESSENGER mission is addressing. During the one-year primary mission, MDIS is scheduled to acquire more than 75,000 images in support of MESSENGER's science goals.

Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

For information regarding the use of MESSENGER images, see the image use policy.


   Top  | Contacts
© 1999-2015 by JHU/APL