Headlines > News > NASA's LRO Snaps a Picture of NASA's LADEE Spacecraft

NASA's LRO Snaps a Picture of NASA's LADEE Spacecraft

Published by Klaus Schmidt on Thu Jan 30, 2014 5:34 am via: NASA
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With precise timing, the camera aboard NASA’s Lunar Reconnaissance Orbiter (LRO) was able to take a picture of NASA’s Lunar Atmosphere and Dust Environment Explorer (LADEE) spacecraft as it orbited our nearest celestial neighbor. The Lunar Reconnaissance Orbiter Camera (LROC) operations team worked with its LADEE and LRO operations counterparts to make the imaging possible.

LADEE passed directly beneath the LRO orbit plane a few seconds before LRO crossed the LADEE orbit plane, meaning a straight down LROC image would have just missed LADEE. The LADEE and LRO teams worked out the solution: simply have LRO roll 34 degrees to the west so the LROC detector (one line) would be in the right place as LADEE passed beneath.

LRO imaged LADEE, about 5.6 miles beneath it, at 8:11 p.m. EST on Jan. 14, 2014. (LROC NAC image M1144387511LR. Image width is 821 meters, or about 898 yards.) Image Credit: NASA/Goddard/Arizona State University

LRO imaged LADEE, about 5.6 miles beneath it, at 8:11 p.m. EST on Jan. 14, 2014. (LROC NAC image M1144387511LR. Image width is 821 meters, or about 898 yards.) Image Credit: NASA/Goddard/Arizona State University

As planned at 8:11 p.m. EST on Jan. 14, 2014, LADEE entered LRO’s Narrow Angle Camera (NAC) field of view for 1.35 milliseconds and a smeared image of LADEE was snapped. LADEE appears in four lines of the LROC image, and is distorted right­to­left. What can be seen in the LADEE pixels in the NAC image?

Step one is to minimize the geometric distortion in the smeared lines that show the spacecraft. However, in doing so the background lunar landscape becomes distorted and unrecognizable (see above). The scale (dimension) of the NAC pixels recording LADEE is 3.5 inches (9 cm), however, as the spacecraft were both moving about 3,600 mph (1,600 meters per second) the image is blurred in both directions by around 20 inches (50 cm). So the actual pixel scale lies somewhere between 3.5 inches and 20 inches. Despite the blur it is possible to find details of the spacecraft, which is about 4.7 feet (1.9 meters) wide and 7.7 feet (2.4 meters) long. The engine nozzle, bright solar panel and perhaps a star tracker camera can be seen (especially if you have a correctly oriented schematic diagram of LADEE for comparison).

This subsection of the LRO image, expanded four times, shows the smeared view of LADEE. Image Credit: NASA/Goddard/Arizona State University

This subsection of the LRO image, expanded four times, shows the smeared view of LADEE. Image Credit: NASA/Goddard/Arizona State University

LADEE was launched Sept. 6, 2013. LADEE is gathering detailed information about the structure and composition of the thin lunar atmosphere and determining whether dust is being lofted into the lunar sky.

LRO launched Sept. 18, 2009. LRO continues to bring the world astounding views of the lunar surface and a treasure trove of lunar data.

NASA’s Goddard Space Flight Center in Greenbelt, Md., manages the LRO mission. NASA’s Ames Research Center in Moffett Field, Calif., manages the LADEE mission.

This animation compares the LRO image (geometrically corrected) with a computer-generated image of LADEE. Image Credit: NASA/Goddard/Arizona State University

This animation compares the LRO image (geometrically corrected) with a computer-generated image of LADEE. Image Credit: NASA/Goddard/Arizona State University

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