NASA’s Mars Reconnaissance Orbiter (MRO) continues to deliver the most sharp-eyed coverage ever achieved by a camera at Mars as it completes its 50,000th orbit.
The NASA Mars Reconnaissance Orbiter thus carries on with its diverse science observations of Mars, the red planet, and continues communications-relay service for two active Mars rovers, Curiosity and Opportunity.
NASA Mars Reconnaissance Orbiter achieves a sweet spot in the balance between resolution and image file size. With a resolution of about six metres per pixel in pictures of the surface of the Mars, the NASA Mars Reconnaissance Orbiter has provided plenty of images now covering 99.1 per cent of the red planet.
This accounts for about equivalent to the land area of our planet Earth. No other camera ever sent to the red planet has photographed so much of Mars in such high resolution.
About 90,000 images have been clicked by the Context Camera since the NASA Mars Reconnaissance spacecraft started examining Mars orbit in late 2006.
Each picture shows shapes of features down to sizes smaller than a tennis court, in a swath of ground about 30 kilometers wide.
“Reaching 99.1 per cent coverage has been tricky because a number of factors, including weather conditions, coordination with other instruments, downlink limitations, and orbital constraints, tend to limit where we can image and when,” said Michael Malin, Context Camera Team Leader of Malin Space Science Systems in the US.
In addition to observing nearly the entire planet at least once, the Context Camera has observed 60.4 per cent of the planet more than once. These observations aid science directly and also certify the safety of future landing sites.
“Single coverage provides a baseline we can use for comparison with future observations, as we look for changes,” Malin said.
“Re-imaging areas serves two functions: looking for changes and acquiring stereoscopic views from which we can make topographic maps,” he said.
A dramatic type of change the Context Camera has documented more than 200 times is a fresh impact crater appearing between the times of two observations.
These images enabled scientists to calculate the rate at which small asteroids, or bits of comets, are colliding with Mars. Some of the fresh impacts reveal white material interpreted as water ice.
The spacecraft was launched in 2005. It entered an elongated orbit of Mars in March 2006, then spent several months using friction with Mars’ upper atmosphere to revise its orbit.
Since beginning its science operations in November 2006, MRO has been flying near-polar orbits lasting about two hours, at altitudes from 250 to 316 kilometers. The mission completed its 50,000th orbit on March 27.
“After 11 and a half years in flight, the spacecraft is healthy and remains fully functional,” said MRO Project Manager Dan Johnston at NASA’s Jet Propulsion Laboratory, Pasadena, California.
(With inputs from PTI)