New LRO Image of Apollo 15 Landing Site

The Apollo 15 Lunar Module (LM) Falcon set down on the Hadley plains (26.132*N, 3.634*E) a mere 2 kilometers from Hadley Rille. The goals: sample the basalts that compose the mare deposit, explore a lunar rille for the first time, and search for ancient crustal rocks. Additionally, Dave Scott and Jim Irwin deployed the third Apollo Lunar Surface Experiments Package (ALSEP) and unveiled the first Lunar Roving Vehicle (LRV). The ALSEP consisted of several experiments that were powered by a Radioisotope Thermoelectric Generator (RTG) and sent back valuable scientific data to the Earth for over six years after the astronauts left. This new LROC NAC image taken from low altitude shows the hardware and tracks in even more detail.

The LRV, a lunar "dune buggy", allowed the astronauts to traverse far from the LM and explore much more local geology than the astronauts on previous missions (Apollo 11, 12, 14). Not only did the LRV allow the astronauts to move from place-to-place at a lively rate of eight to sixteen kilometers per hour (five to ten miles per hour), but the LRV also allowed brief periods of rest that in turn helped to conserve oxygen.

The LRV wheels were 82 centimeters (32 inches) in diameter, and 23 centimeters (9 inches) wide. Typically LROC NAC pixels are about 50 centimeters square, so it is not always easy to pick out the LRV tracks. In previous LROC images, the LRV tracks are usually only visible near the LM where the descent engine exhaust plume disturbed the surface. The LRV wheels broke through the changed surface and thus the tracks have more contrast near the LM.

For two one-month periods last year (2011), the LRO orbit was lowered such that overflights of the Apollo sites were only 25 to 30 kilometers, rather than the usual 50 kilometers. These low passes resulted in NAC pixel scales near 25 centimeters! LRO has a ground speed of a bit over 1600 meters (5249 feet) per second, and the shortest NAC exposure time is 0.34 millseconds, so images taken from this low altitude are smeared down track a bit. However, the smear is hardly noticeable and features at the Apollo sites definitely come into sharper focus. In this new low-altitude NAC image of the LRV, tracks are visible about half of the time, usually when the tracks are at an angle to the Sun direction, rather than parallel.

More

LOIRP
- About
- Contact

Categories

 

RECOMMENDED BOOKS

Moonrush: Improving Life on Earth with the Moon's Resources
Moonrush: Improving Life on Earth with the Moon's Resources

The Kaguya Lunar Atlas: The Moon in High Resolution
The Kaguya Lunar Atlas: The Moon in High Resolution

Lunar Reconnaissance Orbiter Mission
Lunar Reconnaissance Orbiter Mission

Lunar Orbiter Photographic Atlas of the Near Side of the Moon
Lunar Orbiter Photographic Atlas of the Near Side of the Moon

The Far Side of the Moon: A Photographic Guide
The Far Side of the Moon: A Photographic Guide

The Clementine Atlas of the Moon
The Clementine Atlas of the Moon

The International Atlas of Lunar Exploration
The International Atlas of Lunar Exploration

Voices from the Moon: Apollo Astronauts Describe Their Lunar Experiences
Voices from the Moon: Apollo Astronauts Describe Their Lunar Experiences

Apollo: Through the Eyes of the Astronauts
Apollo: Through the Eyes of the Astronauts

Space News
- Moon Today
- SpaceRef

Social Media
- Facebook
- Twitter
- Google+

MoonViews

Monthly Archives

PARTICIPANTS
- NASA SSERVI
- Skycorp
- SpaceRef
LUNAR ORBITER
- Overview
- LPI Image Archive
- Documents

LUNAR MISSIONS
Scientific
- Apollo
- ARTEMIS - Chandrayaan-1
- Chandrayaan-2
- Chang'e-1
- Chang'e-2
- Clementine
- GRAIL - Kaguya
- Lunar Reconnaissance Orbiter
- LCROSS
- Luna
- Lunakhod
- Lunar Prospector
- Ranger
- SMART-1
- Surveyor
- Zond

Visit the MoonViews store