Tag: Moon

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The recent images released by the Lunar Reconnaissance Orbiter of the Apollo landing sites are truly remarkable. But there is one instrument on board LRO that must avoid studying some of the the Apollo sites as well as other places where humans have placed spacecraft on the the lunar surface. The Lunar Orbiting Laser Altimeter (LOLA) pulses a single laser beam down to the surface to create a high-resolution global topographic map of the Moon. However, LOLA is turned off when it passes over the Apollo sites because bouncing the laser off any of the retro-reflective mirrors on experiments left by the astronauts might damage the instrument.

Don Mitchell, who owns a software consulting company and is writing a book on the Soviet Exploration of Venus, wrote about this problem on his blog, saying that if LOLA’s beam did strike the retro reflector experiment, “the light bounced back would be 1,000 times the detector damage threshold.”

The LOLA instrument is based on Mars Orbiter Laser Altimeter (MOLA), flown on Mars Global Surveyor and the Mercury Laser Altimeter (MLA), currently on MESSENGER. LOLA will perform the same type of work as these previous instruments, but with 3-5 times greater vertical accuracy and 14 times more measurements along the spacecraft ground track.

The Laser Ranging Retroreflector experiment was deployed on Apollo 11, 14, and 15. It consists of a series of corner-cube reflectors, which reflects an incoming light beam back in the direction it came from.

Ever since the experiments were deployed, the McDonald Observatory in Texas has beamed a laser at these mirrors and measured the round-trip of the beam. This provides accurate data on the Moon’s orbit, the rate at which the Moon is receding from Earth (currently 3.8 centimeters per year) and variations in the rotation of the Moon. These are the only Apollo experiments that are still returning data. A similar device was also included on the Soviet Union’s Lunakhod spacecraft.

David E. Smith, LOLA principal investigator confirmed that, indeed, LOLA is switched off over the Apollo and Lunakhod sites, to avoid damaging the instrument. He said the Russians have been very helpful in in providing the LOLA team the best known locations for the two Lunokhod landers. Lunokhod-2 has been located precisely and is routinely probed by lasers from Earth. Lunokhod-1 has never been found by laser, and it is not known for certain if its reflector is deployed. Smith said he and co-PI Maria Zuber have visited Moscow to consult with Russian scientists, who have shared their knowledge of the locations of their landers.

As Mitchell wrote, “While conspiracy nuts debate the reality of the Apollo landings, scientists must deal with some practical consequences of what astronauts put on the Moon.”

Sources: Don Mitchell’s Blog, email exchange with David E. Smith

Hat tip to Emily Lakdawalla on Twitter!

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As anticipated, NASA released images of the Apollo landing sites taken by the Lunar Reconnaissance Orbiter (LRO). The pictures show the Apollo missions’ lunar module descent stages sitting on the moon’s surface, as long shadows from a low sun angle make the modules’ locations evident. Also visible are the tracks left where the astronauts walked repeatedly in a “high traffic zone” and perhaps by the Modularized Equipment Transporter (MET) wheelbarrow-like carrier used on Apollo 14. Wow.

As a journalist, I (most of the time) try to remain objective and calm. But there’s only one response to these images: W00T!

These first images were taken between July 11 and 15, and the spacecraft is not yet in its final mapping orbit. Future LROC images from these sites will have two to three times greater resolution.

These images are the first glimpses from LRO,” said Michael Wargo, chief lunar scientist, NASA Headquarters, Washington. “Things are only going to get better.”

The Japanese Kaguya spacecraft previously took images of some of the Apollo landing sites, but not at a high enough resolution to show any of the details of the lander or any other details. But here on these images, the hardware is visible. “It’s great to see the hardware on the surface, waiting for us to return,” said Mark Robinson, principal investigator for LRO.

Robinson said the LROC team anxiously awaited each image. “We were very interested in getting our first peek at the lunar module descent stages just for the thrill — and to see how well the cameras had come into focus. Indeed, the images are fantastic and so is the focus.”

The Lunar Reconnaissance Orbiter Camera, or LROC, was able to image five of the six Apollo sites, with the remaining Apollo 12 site expected to be photographed in the coming weeks.

The spacecraft’s current elliptical orbit resulted in image resolutions that were slightly different for each site but were all around four feet per pixel. Because the deck of the descent stage is about 12 feet in diameter, the Apollo relics themselves fill an area of about nine pixels. However, because the sun was low to the horizon when the images were made, even subtle variations in topography create long shadows. Standing slightly more than ten feet above the surface, each Apollo descent stage creates a distinct shadow that fills roughly 20 pixels.

The image of the Apollo 14 landing site had a particularly desirable lighting condition that allowed visibility of additional details. The Apollo Lunar Surface Experiment Package, a set of scientific instruments placed by the astronauts at the landing site, is discernable, as are the faint trails between the module and instrument package left by the astronauts’ footprints.

Source: NASA