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SOLAR SCIENCE
NASA's Lunar mission captures solar eclipse as seen from the moon
by Staff Writers
Greenbelt MD (SPX) Aug 30, 2017


NASA's Lunar Reconnaissance Orbiter shows the shadow of the Moon cast on the United States during the Aug. 21, 2017, total solar eclipse.

During the total solar eclipse on Aug. 21, NASA's Lunar Reconnaissance Orbiter, or LRO, captured an image of the Moon's shadow over a large region of the United States, centered just north of Nashville, Tennessee.

As LRO crossed the lunar south pole heading north at 3,579 mph (1,600 meters per second), the shadow of the Moon was racing across the United States at 1,500 mph (670 meters per second).

A few minutes later, LRO began a slow 180-degree turn to look back at Earth, capturing an image of the eclipse very near the location where totality lasted the longest. The spacecraft's Narrow Angle Camera began scanning Earth at 2:25:30 p.m. EDT (18:25:30 UTC) and completed the image 18 seconds later.

The Narrow Angle Camera is part of the Lunar Reconnaissance Orbiter Camera system. Two Narrow Angle Cameras capture high-resolution black and white images, and a third, the Wide Angle Camera, captures moderate-resolution images using filters to provide information about the properties and color of the lunar surface.

The Narrow Angle Camera builds up an image line by line rather than the more typical "instantaneous" framing that occurs with digital or cell-phone cameras. Each line of the image is exposed for less than one-thousandth of a second; the exposure time was set as low as possible to prevent bright clouds from saturating the sensor. It takes about 18 seconds to acquire all 52,224 lines for the image.

While the thrill of the total eclipse was in experiencing the shadow of the Moon sweep across us on Earth, on the Moon this was just another day. The lunar nearside was one week into its two-week night, while the Sun shone on the far side in the middle of its two-week day. Because solar eclipses do not affect the health or power supply of the spacecraft, LRO operated normally during the total solar eclipse.

Launched on June 18, 2009, LRO has collected a treasure trove of data with its seven powerful instruments, making an invaluable contribution to our knowledge about the Moon and reminding us, through these eclipse images, of the beauty of our Earth.

LRO is managed by NASA's Goddard Space Flight Center in Greenbelt, Maryland, as a project under NASA's Discovery Program. The Discovery Program is managed by NASA's Marshall Spaceflight Center in Huntsville, Alabama, for the Science Mission Directorate at NASA Headquarters in Washington.

The Lunar Reconnaissance Orbiter Camera was developed at Malin Space Science Systems in San Diego, California and Arizona State University.

SOLAR SCIENCE
Charleston C-17 flies on "dark side of the moon"
Joint Base Charleston SC (AFNS) Aug 28, 2017
An aircrew of reserve Airmen from Joint Base Charleston, South Carolina had the opportunity Aug. 21, 2017 to fly a routine C-17 Globemaster III training mission under not so routine conditions-flying in the path of a total solar eclipse. During the standard training flight, the Air Force Reserve, comprised of 317th and 701st Airlift Squadron members, practiced "time on target" tactics as t ... read more

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