Click on the image for larger version unannotated version
Researchers used the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity to capture this 10-second-exposure view of comet C/2013 A1 Siding Spring as it passed near Mars on Oct. 19, 2014.
This image was 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 2.5-pixel smear from rotation of Mars.
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/.