Last Tuesday, a final maneuver put LRO 50 km (31 miles) above the Moon, closer than any previous orbiter. LRO has already proved its keen eyes, imaging fine details of the Apollo landing sites earlier this summer with the LROC, the Lunar Reconnaissance Orbiter Camera.
Coldest place in the solar system
According to the first measurements from the Diviner instrument, which has infrared radiation detectors, LRO found that temperatures at about 35 Kelvin, or -238º Celsius deep in some permanently shaded regions. Vondrak said that these bitterly cold regions at the south pole “are perhaps the coldest part of the solar system.” With such cold temperatures, volatiles like water ice could be present, preserved for billions of years.
And indeed, first results from LRO's Lunar
Exploration Neutron Detector, or LEND instrument
found hallmarks of hydrogen—a potential marker
of water— not only in deep, dark
craters, but in unexpected places as well.
"What it also seems to indicate is that the hydrogen is not confined to permanently shadowed craters," said Vondrak. "Some of the permanently shadowed craters do indeed contain hydrogen. Others, on the other hand, do not appear to have hydrogen. And in addition, there appears to be concentrations of hydrogen that are not confined to the permanently shadowed regions."
Surface topography
Data from LRO's Lunar Orbiter Laser Altimeter,
or LOLA, give scientists a detailed look at the
topography of the lunar south pole, shown here.
Red regions are high altitude, and blue regions
are low altitude.
Some of the first results have turned up fresh craters, unknown boulders, and smooth sites that would be good landing sites for future humans or robotic missions. However, most regions are filled with rough terrain, which will make in situ exploration difficult. The roughness is probably a result of the lack of atmosphere and absence of erosion from wind or water, according to David Smith, LOLA principal investigator.
Another instrument, LRO's Cosmic Ray
Telescope for the Effects of Radiation
instrument is exploring the lunar radiation
environment and its potential effects on humans
during record high, "worst-case" cosmic ray
intensities accompanying the extreme
solar minimum conditions of this
solar cycle, showing damaging amounts of
radiation at various points.
The Mini RF Technology Demonstration on LRO has
confirmed communications capability and produced
detailed radar images of potential targets for
LRO's companion mission, LCROSS, the Lunar
Crater Observation and Sensing Satellite,
which will impact the moon's south pole on Oct.
9.
LRO's prime science mission will last a year.
"The LRO instruments, spacecraft, and ground systems continue to operate essentially flawlessly," said Craig Tooley, LRO project manager at Goddard "The team completed the planned commissioning and calibration activities on time and also got a significant head start collecting data even before we moved to the mission's mapping orbit."
“There’s still an awful lot to be done,” says Michael Wargo, chief lunar scientist at NASA Headquarters in Washington, D.C. “And the maps will only get better.”
Related stories on Universe Today
- Methane and Water Overlap on Mars
- Mars Express Finds South Pole Water Ice
- New Map Hints at Venus' Wet, Volcanic Past
- First Odyssey Photos Released
- Potential Discovery of Water Ice on Mars?
June 16, 2009 5:24 PM PDT