HiRISE Mars camera reveals hundreds of impacts each year

May 15, 2013
This image shows one of many fresh impact craters spotted by the UA-led HiRISE camera, orbiting the Red Planet on board NASA's Mars Reconnaissance Orbiter since 2006. Credit: NASA/JPL-Caltech/MSSS/UA

Scientists using images from NASA's Mars Reconnaissance Orbiter, or MRO, have estimated that the planet is bombarded by more than 200 small asteroids or bits of comets per year forming craters at least 12.8 feet (3.9 meters) across.

Researchers have identified 248 new impact sites on parts of the Martian surface in the past decade, using images from the spacecraft to determine when the craters appeared. The 200-per-year planetwide estimate is a calculation based on the number found in a systematic survey of a portion of the planet.

The University of Arizona's , or HiRISE camera, took pictures of the fresh craters at sites where before and after images had been taken. This combination provided a new way to make direct measurements of the impact rate on Mars and will lead to better age estimates of recent features on Mars, some of which may have been the result of .

"It's exciting to find these new craters right after they form," said Ingrid Daubar of the UA, lead author of the paper published online this month by the journal Icarus. "It reminds you Mars is an active planet, and we can study processes that are happening today."

These asteroids or comet fragments typically are no more than 3 to 6 feet (1 to 2 meters) in diameter. too small to reach the ground on Earth cause craters on Mars because the has a much thinner atmosphere.

HiRISE targeted places where dark spots had appeared during the time between images taken by the spacecraft's Context Camera, or CTX, or cameras on other orbiters. The new estimate of cratering rate is based on a portion of the 248 new craters detected. If comes from a systematic check of a dusty fraction of the planet with CTX since late 2006.

These images taken by the Mars Reconnaissance Orbiter document the appearance of a new cluster of impact craters on Mars. The upper-right image (May 2011) shows a dark patch at the center that is not present in the upper-left image, taken in August 2010. The scale bar on each of these two images is 2.5 kilometers (1.6 miles). Impacts produce a dark-looking blast zone where the dust is disturbed. Researchers investigated the new dark spot with the UA's HiRISE camera, obtaining the lower image showing a cluster of small, fresh craters. The scale bar on this image is 100 meters (328 feet). Credit: NASA/JPL-Caltech/MSSS/Univ. of Arizona

The impacts disturb the dust, creating noticeable blast zones. In this part of the research, 44 fresh impact sites were identified.

The meteor over Chelyabinsk, Russia, in February was about 10 times bigger than the objects that dug the fresh Martian craters.

Estimates of the rate at which new craters appear serve as scientists' best yardstick for estimating the ages of exposed landscape surfaces on Mars and other worlds.

Daubar and co-authors calculated a rate for how frequently new craters at least 12.8 feet (3.9 meters) in diameter are excavated. The rate is equivalent to an average of one each year on each area of the roughly the size of the U.S. state of Texas. Earlier estimates pegged the cratering rate at three to 10 times more craters per year. They were based on studies of craters on the moon and the ages of lunar rocks collected during NASA's Apollo missions in the late 1960s and early 1970s.

"Mars now has the best-known current rate of cratering in the solar system," said UA's HiRISE Principal Investigator Alfred McEwen, a co-author on the paper.

Mars gets blasted with space rocks much more frequently than Earth because they are less likely to burn up in its thinner atmosphere. Credit: NASA/JPL-Caltech/MSSS/Univ. of Arizona

MRO has been examining Mars with six instruments since 2006. Daubar is an imaging targeting specialist who has been on the HiRISE uplink operation s team from the very beginning. She is also a graduate student in the UA's department of planetary science and plans on graduating with her doctorate in spring 2014.

"There are five of us who help plan the images that HiRISE will take over a two-week cycle," she explained. "We work with science team members across the world to understand their science goals, help select the image targets and compile the commands for the spacecraft and the camera."

"The longevity of this mission is providing wonderful opportunities for investigating changes on ," said MRO Deputy Project Scientist Leslie Tamppari of 's Jet Propulsion Laboratory in Pasadena, Calif.

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1 / 5 (2) May 15, 2013
Ive been talking about this for some time. Mars unlike earth has no oceans to obscure meteorites. It has geological or hyrological cycle other than wind erosion and radiation to wear down asteroids. A massive treasure trove of asteroids awaits us openly on the surface of mars. Millions of years of asteroids covered under a presumably thin layer of martian regolith.

What we dont know yet is how martian surface soils, abd percholate, may oxidize, reduce, or combine with various asteroid compositions essentially wearing it away and breaking them down over time. With low pressure low temperature and no atmospheric oxygen it would seem theres an order of magnitude less corrosion on martian asteroids than earth ones. Let alone the lack of martian atmosphere allowing falling asteroids to land without to much pre landing friction heating.