PIA18591: Mars Rover Opportunity's View of Passing Comet
 Target Name:  Mars
 Is a satellite of:  Sol (our sun)
 Mission:  Mars Exploration Rover (MER)
 Spacecraft:  Opportunity
 Instrument:  Panoramic Camera
 Product Size:  1020 x 1024 pixels (w x h)
 Produced By:  Arizona State University
 Full-Res TIFF:  PIA18591.tif (1.046 MB)
 Full-Res JPEG:  PIA18591.jpg (311.3 kB)

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Figure A
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Researchers used the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity to capture this view of comet C/2013 A1 Siding Spring as it passed near Mars on Oct. 19, 2014.

This image is from a 50-second exposure taken about two-and-a-half hours before the closest approach of the comet's nucleus to Mars. The sky was still relatively dark, before Martian dawn. At the time of closest approach, the morning sky was too bright for observation of the comet.

The comet, some nearby stars, and some effects of cosmic rays hitting the camera's light detector are labeled. Figure A is an unannotated version of the image.

The image has been processed by removal of detector artifacts and slight twilight glow. The duration of the exposure resulted in a 12.5-pixel smear from rotation of Mars. The smear for the comet is at a slightly different angle from the others, due to the comet's own motion across the sky.

A Martian dust storm to the west of Opportunity hampered visibility somewhat on Oct. 19, compared to the sky over Opportunity a week earlier.

For more information about comet Siding Spring, see http://mars.nasa.gov/comets/sidingspring/.

Image Credit:
NASA/JPL-Caltech/Cornell Univ./ASU/TAMU

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