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Mars Orbiter image shows comet nucleus is small

Date:
October 21, 2014
Source:
NASA
Summary:
The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter captured views of comet C/2013 A1 Siding Spring while that visitor sped past Mars on Sunday (Oct. 19), yielding information about its nucleus.
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The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter captured views of comet C/2013 A1 Siding Spring while that visitor sped past Mars on Sunday (Oct. 19), yielding information about its nucleus.

The images are the highest-resolution views ever acquired of a comet coming from the Oort Cloud at the fringes of the solar system. Other spacecraft have approached and studied comets with shorter orbits. This comet's flyby of Mars provided spacecraft at the Red Planet an opportunity to investigate from close range.

Images of comet Siding Spring from HiRISE are online at: http://www.jpl.nasa.gov/spaceimages/details.php?id=PIA18618

The highest-resolution of images of the comet's nucleus, taken from a distance of about 86,000 miles (138,000 kilometers), have a scale of about 150 yards (138 meters) per pixel. Telescopic observers had modeled the size of the nucleus as about half a mile, or one kilometer wide. However, the best HiRISE images show only two to three pixels across the brightest feature, probably the nucleus, suggesting a size smaller than half that estimate.

For more about HiRISE, visit: http://hirise.lpl.arizona.edu

For more about Mars Reconnaissance Orbiter, visit: http://mars.nasa.gov/mro/

For more about comet Siding Spring, including other images of the comet, visit: http://mars.jpl.nasa.gov/comets/sidingspring/


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Materials provided by NASA. Note: Content may be edited for style and length.


Cite This Page:

NASA. "Mars Orbiter image shows comet nucleus is small." ScienceDaily. ScienceDaily, 21 October 2014. <www.sciencedaily.com/releases/2014/10/141021003344.htm>.
NASA. (2014, October 21). Mars Orbiter image shows comet nucleus is small. ScienceDaily. Retrieved December 5, 2024 from www.sciencedaily.com/releases/2014/10/141021003344.htm
NASA. "Mars Orbiter image shows comet nucleus is small." ScienceDaily. www.sciencedaily.com/releases/2014/10/141021003344.htm (accessed December 5, 2024).

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