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Mars Reconnaissance Orbiter achieves imaging of comet ISON from Mars

Posted by Emily Lakdawalla

02-10-2013 12:03 CDT

Topics: pretty pictures, astronomy by planetary missions, Mars Reconnaissance Orbiter

Yesterday, the much-anticipated comet ISON made its closest pass by Mars. Despite the government shutdown, all NASA spacecraft are still operating normally, and Mars Reconnaissance Orbiter, Curiosity, and Opportunity have all attempted imaging over the last several days. Mars Reconnaissance Orbiter's HiRISE camera is the first to achieve a positive detection of the somewhat-fainter-than-expected comet in its photos:

First photos of comet ISON from Mars Reconnaissance Orbiter


First photos of comet ISON from Mars Reconnaissance Orbiter
On September 29, 2013, the Mars Reconnaissance Orbiter maneuvered to point its High Resolution Imaging Science Experiment (HiRISE) camera at ISON, a new comet passing by Mars on its way into the inner Solar System. HiRISE saw a small spot at the position of ISON that is relatively bright, like a star, but moving relative to actual stars. The comet's coma is apparently very faint, so these data provide useful constraints on the size of the comet nucleus and its overall brightness, key measurements to understand its behavior and useful knowledge to subsequent observers.

The caption posted at the HiRISE website, written by Alan Delamere and Alfred McEwen, explains further:

These images show a 256 x 256 pixel patch of sky at the range to the comet of 8 million miles and when the solar phase angle is 47 degrees. Three more observations of ISON are planned for 1 and 2 October as the comet moves through closest approach to Mars at 7 million miles, but with less illumination as seen from Mars.

Based on preliminary analysis of the data, the comet appears to be at the low end of the range of brightness predictions for the observation. As a result, the image isn't visually pleasing but low coma activity is best for constraining the size of the nucleus. This image has a scale of approximately 8 miles (13.3 km) per pixel, larger than the comet, but the size of the nucleus can be estimated based on the typical brightness of other comet nuclei. The comet, like Mars, is currently 241 million kilometers from the Sun. As the comet gets closer to the sun, its brightness will increase to Earth-based observers and the comet may also become intrinsically brighter as the stronger sunlight volatilizes the comet's ices.

The images attempted by Opportunity and Curiosity are released in their raw form on the mission websites, but if the comet is visible in those images, it is lost in the compression artifacts. (The usual gang of image processors at has been working to bring out any signal of the comet from the raw images, so far without success.)

See other posts from October 2013


Or read more blog entries about: pretty pictures, astronomy by planetary missions, Mars Reconnaissance Orbiter


Anonymous: 10/08/2013 12:42 CDT

I am hoping for the brightness of the comet to increase as it approaches the Sun. I am looking forward to observing the comet and I hope that it survives its encounter with the Sun..

Sirius: 10/22/2013 07:19 CDT

@Anonymous Comet ISON's brightness might be as bright as venus, or around -6 to -8. visible to naked eye, so don't worry About the survive or not, I not sure it will survive... but Comet Lovejoy, passing much more closer than ISON Survived.

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