LROC: Pinpoint Landing on the Moon (Apollo 12)

Descent and landing of Apollo 12 in Oceanus Procellarum, November 1969.

The Apollo 12 landing site (3.0119°S, 336.585°E) in Oceanus Procellarum, imaged during the second LRO low-altitude campaign, orbit 10,987, November 11, 2011. Field of view width = 225 meters, LROC Narrow Angle Camera (NAC) observation M175428601R  View the full size LROC Featured Image HERE [NASA/GSFC/Arizona State University].

Samuel Lawrence
LROC News System

The LRO mission continues to collect observations that are enabling ground-breaking new scientific discoveries about the Moon. As geologists, whenever we look at remotely sensed data collected from another planet, in a sense we are staring back in time. But this is the “deep time” of geology, where we are trying to understand natural processes that (at least on the Moon, anyway) could have happened billions of years ago. But the LRO mission is unique because we can also see human history. Not just any history, either, but one of humanity's greatest accomplishments, our first steps on another world. Twelve astronauts explored the lunar surface, directly seeing things with their own eyes, making observations, and collecting samples with their own hands. These samples and observations revolutionized our understanding of our solar system.

This “snapshot in time” effect is especially evident at the Apollo 12 landing site in Oceanus Procellarum, now known as Statio Cognitum. Here, you can see the remnants of not one, but two missions to the Moon. Astronauts Pete Conrad and Alan Bean demonstrated that a precision lunar landing with the Apollo system was possible, enabling all of the targeted landings that followed. Bean and Conrad collected rock samples and made field observations, which resulted in key discoveries about lunar geology. They also collected and returned components from the nearby US Surveyor 3 spacecraft, which landed at this site almost two and half years previously, providing important information to engineers about the how materials survive in the lunar environment.

Annotated low altitude LROC NAC image of the Apollo 12 landing site (view the glorious 2438 x 2109 image HERE). The informal names of craters visited by the astronauts, the positions of the ALSEP, Intrepid descent stage, and Surveyor 3 spacecraft are highlighted. LROC NAC M175428601R [NASA/GSFC/Arizona State University].

In the image above, you can see the remnants of the scientific experiments the astronauts set up on the surface, the first long-term Apollo Lunar Surface Experiments Package (ALSEP).  Powered by a Radioisotope Thermoelectric Generator (RTG), the ALSEP included a seismometer to record "moonquakes" and several experiments designed to make measurements of the lunar environment, including a Solar Wind Spectrometer, a Cold Cathode Ion Gauge, and a Suprathermal Ion Detector (see if you can find each piece of hardware). The Apollo 12 ALSEP returned data and measurements to Earth for over seven years following the mission and was turned off in September 1977. From the lower altitude you can pick out the shadow of the still standing flag, the High Gain Antenna (HGA), and the discarded Portable Life Support System (PLSS) backpacks.

Apollo 12 photograph of the ALSEP central station, with Intrepid and S-band High Gain Antenna (HGA) in the background. The ribbon cables in this image are clearly visible in the first low-altitude LROC image of the Apollo 12 landing site, below [NASA high-resolution photograph AS12-47-6928].

After deploying the ALSEP, the astronauts moved to the northwest, eventually stopping to take a series of photographs of the crater dubbed “Middle Crescent”. The boulders the astronauts observed on the surface are visible in the LROC image above.

Apollo 12 photograph of the interior of Middle Crescent crater, taken during the first Apollo 12 EVA [NASA high-resolution photograph AS12-46-6838].

During the second EVA, the astronauts performed a geologic traverse on foot covering almost 1.5 km. In today’s image, you can clearly follow the path they took edging around Head crater, proceeding to Bench and Sharp craters with a brief stop at Halo crater, visiting the Surveyor spacecraft, and then returning to the Lunar Module.

Apollo 12 photograph of the interior of Sharp crater taken by astronaut Pete Conrad, whose shadow you can see in the lower right [NASA high-resolution photograph AS12-49-7271].

One of the most common questions prior to the launch of LRO was: will you be able to see the American flags that were left on the Moon by the astronauts? The flags themselves are too small to be seen by the NACs, even with the small pixel scales enabled by the low-altitude orbit.  However you can see the shadow being cast by the flag. This is especially evident in this movie [15 MB Quicktime file] of LROC images of a complete lunar day, shown sequentially from dawn to dusk. Watch the rotation of the shadows carefully, and you can see the shadow cast by the flag! Question answered, yes you can find the flag - but what does it look like? Have the stars and stripes faded? That question will remain for a future landed spacecraft.

LRO was placed in low periapse orbits during two months last year: 8 August 2011 to 6 September 2011 and 31 October to 27 November 2011. In each month, LROC was able to obtain low altitude images of the Apollo 12 site. For comparison, the first low-altitude image is shown below. When this image was acquired, the Sun was 54° above the horizon (early-afternoon) and in today's Featured Image the Sun was 45° above the horizon (mid-morning). Incredibly, you can even see the ribbon cables connecting the ALSEP instruments to the central station in this first low-altitude Apollo 12 image (below). The cables appear as bright, straight lines leading from the SIDE and LSM, and are visible because, despite being narrower than the 25-cm pixel scale, they are highly reflective.

First NAC low altitude image of Apollo 12 site, larger area version linked below [NASA/GSFC/Arizona State University].

Forty-two years ago, using technologies that many people today would probably (and erroneously) find hopelessly antiquated, the crew of Apollo 12 executed a flawless precision landing  on another world. Imagine how much more today’s astronauts will accomplish when we return to the Moon with 21st century technology!

Explore the Ocean of Storms in our newest NAC observation, and be sure to check out this YouTube video showing the Apollo 12 landing site:

Other LROC Images of the Apollo 12 Landing Site:
First Look: Apollo 12 and Surveyor 3
Apollo 12 Second Look: Midday on the Ocean of Storms
First Low Altitude Apollo 12 NAC Image

Al Bean inducted into National Aviation Hall of Fame in Dayton, Ohio

Apollo 12 lunar module pilot Alan Bean, active as a renowned artist and speaker, 40 years after he became only the fourth human to walk on the Moon (November 1969).

DAYTON, Ohio — The pilot of the lunar module for the second moon landing is among four people newly inducted into the National Aviation Hall of Fame in Ohio.

Capt. Alan Bean, of Apollo 12's November 1969 moon mission, discussed the landing Saturday at an induction ceremony in Dayton. The 78-year-old from Houston recalled looking out the window of the 6,000 mph spacecraft as it circled the moon 45 miles below.

Also enshrined were: Clay Lacy, a business aviation entrepreneur and cinematographer; the late Warren Grimes, called the "father of aircraft lighting" and an inventor of navigation instruments; and, the late Noel Wien, Arctic flight expert and Wien Alaska Airlines founder.

They joined 203 previous inductees in the hall founded in 1962 in the hometown of the Wright brothers.

Al Bean shares Apollo 12 with community college students in Iowa

"Is anybody out there?" by Alan Bean. Apollo 12 Lunar Module Pilot Alan Bean became the fourth of twelve humans to set foot on the Moon, November 19, 1969, the first pinpoint, targeted landing on another world. After Pete Conrad and Bean returned to Earth with Command Module Pilot Dick Gordon, Bean retired from NASA and the U.S. Navy and became a professional artist. He's made an enjoyable attempt to capture the experience in his art ever since [Alan Bean Gallery (2000) 30 3/4 x 41 inches, Textured Acryllic with Moon Dust on Aircraft Plywood].

KCCI.com - Des Moines - A man who walked on the moon just four months after Neil Armstrong and Buzz Aldrin took their historic steps appeared in Des Moines on Friday to share his experience.

Alan Bean was part of the Apollo 12 mission to land on and explore the Ocean of Storms in late 1969.

"It was more than my childhood dream," Bean said. "I feel that I'm the luckiest person you've ever met."

Read the story HERE.

Midday on the Ocean of Storms - High-Sun Lunar Reconnaissance Orbiter Camera (LROC) Narrow-Angle Camera (NAC) frame showing Oceanus Procellarum, including the Apollo 12 landing site explored by Pete Conrad and Al Bean in 1969. Can you spot the descent stage of the lunar module Intrepid and the Surveyor III spacecraft in the ASU Zoomify frame [NASA/GSFC/Arizona State University].

"It's up to us," Bean says

In celebration of Lyndon B. Johnson’s 100th birthday and the 40th anniversary of the Apollo 11 mission, the LBJ Library hosted a discussion on the past, present and future of space exploration at UT Austin.

The panel of guest speakers, headlined by retired astronaut and UT graduate Alan Bean, detailed the challenges facing NASA in their quest to revisit the moon, Mars and beyond.

“If we’re going to get anything done in our corner of the universe, it’s up to us,” Bean said. “Hopefully many people in this room will see us go back to the moon and to Mars.”

Bean, the fourth man to set foot on the moon, said NASA plans to have a sustained presence on the moon to serve as a launching pad for Mars visits.

“We want to make everything we do on the surface [of the moon] be related to Mars exploration,” said Matthew Leonard, deputy manager of the Lunar Surface System Project.

Read the story in The Daily Texan HERE