On Monday, May 4th, 2015 flight controllers at NASA’s Goddard Space Flight Center in Greenbelt, Maryland performed two station keeping burns to change Lunar Reconnaissance Orbiter’s orbit. The new orbit allows LRO to pass within 12 miles (20 kilometres) of the South Pole and 103 miles (165 kilometres) over the North Pole.
“We’re taking LRO closer to the Moon than we’ve ever done before, but the manoeuvre is similar to all other station keeping manoeuvres, so the mission operations team knows exactly what to do,” said Steve Odendahl, LRO mission manager from NASA Goddard.
To optimise science return, team members made the decision to change the orbit after determining that the new orbit configuration poses no danger to the spacecraft. LRO can operate for many years at this orbit.
The new orbit enables exciting new science and will see improved measurements near the South Pole. Two of the instruments benefit significantly from the orbit change. The return signal from the Lunar Orbiter Laser Altimeter (LOLA) laser shots will become stronger, producing a better signal. LOLA will obtain better measurements of specific regions near the South Pole that have unique illumination conditions. Diviner will be able to see smaller lunar features through the collection of higher resolution data.
“The lunar poles are still places of mystery where the inside of some craters never see direct sunlight and the coldest temperatures in the Solar System have been recorded,” said John Keller, LRO project scientist at NASA Goddard. “By lowering the orbit over the South Pole, we are essentially magnifying the sensitivity of the LRO instruments which will help us understand the mechanisms by which water or other volatiles might be trapped there.”
Launched on June 18th, 2009, LRO has collected a treasure trove of data with its seven powerful instruments, making an invaluable contribution to our knowledge about the Moon.