This WAC image was acquired 9 minutes and 14 seconds after MESSENGER’s
closest approach to Mercury, when the spacecraft was moving at 6.1
kilometers/second (3.8 miles/second). The image, centered at about 2.4ºS,
290ºE, is one in a sequence of 55: a five-frame mosaic with each frame in
the mosaic acquired in all 11 of the WAC filters. This portion of
Mercury’s surface was previously imaged under different lighting
conditions by Mariner 10, but this new MESSENGER image mosaic is the
highest-resolution color imaging ever acquired of any portion of Mercury’s
surface. Additionally, some of the images in this mosaic overlap with
flyby data acquired by the Mercury Atmospheric and Surface Composition
Spectrometer (MASCS) and Mercury Laser Altimeter (MLA) instruments,
resulting in the first time that these three instruments have gathered
data of the same area of Mercury. The combination of these three datasets
will enable unprecedented studies of this region of Mercury’s surface.
The largest impact feature at the top of the image is about 133 kilometers
(83 miles) in diameter and is named Polygnotus, after a Greek painter from
the 5th century B.C. This basin has a central peak ring and is embayed
with smooth plains material, which is very different in texture from the
surrounding terrain. A second, comparably large crater at the top left of
the image, named Boethius after the 6th century Roman philosopher, also
appears to be almost filled with smooth plains, which were subsequently
deformed during the formation of a prominent scarp.
Date Acquired: October 6, 2008
Image Mission Elapsed Time (MET): 131770421
Instrument: Wide Angle Camera (WAC) of the Mercury Dual Imaging System (MDIS)
WAC Filter: 3 (480 nanometers)
Resolution: 330 meters/pixel (0.21 miles/pixel)
Scale: This image is about 340 kilometers across (210 miles)
Spacecraft Altitude: 1,800 kilometers (1,100 miles)
These images are from MESSENGER, a NASA Discovery mission to conduct the
first orbital study of the innermost planet, Mercury. For information
regarding the use of images, see the MESSENGER image use policy.
