Just two weeks after launching from Vandenberg Space Force Base in California, NASA’s Double Asteroid Redirection Test (DART) spacecraft opened its “eye” and returned its first images from space – a milestone major operational for the spacecraft and the DART team.
After the violent vibrations of the launch and the extreme temperature change of minus 80 degrees Celsius in space, scientists and engineers at the Mission Operations Center at the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland, held their breath in anticipation. . Since components of the spacecraft’s telescopic instrument are sensitive to movements as small as 5 millionths of a meter, even a small displacement of something in the instrument could be very serious.
On Tuesday, December 7, the spacecraft opened the circular door covering the aperture of its DRACO telescopic camera and, to everyone’s delight, beamed back the first image of its surrounding environment. Taken about 2 million miles (11 light seconds) from Earth – very close, astronomically speaking – the image shows a dozen stars, crystalline and sharp against the black background of space, near the intersection constellations Perseus, Aries and Taurus.
The DART navigation team at NASA’s Jet Propulsion Laboratory in California used the stars in the image to determine precisely how DRACO was oriented, providing the first measurements of how the camera is pointed relative to the spacecraft. With these measurements in hand, the DART team was able to precisely move the spacecraft to point DRACO at objects of interest, such as Messier 38 (M38), also known as the Starfish Cluster, which DART captured in another image on December 10. Located in the constellation Auriga, the cluster of stars lies approximately 4,200 light-years from Earth. Intentionally capturing images with many stars like M38 helps the team characterize optical imperfections in images as well as calibrate an object’s absolute brightness – all important details for accurate measurements when DRACO begins imaging. the spacecraft’s destination, the binary asteroid system Didymos.
DRACO (short for Didymos Reconnaissance and Asteroid Camera for Optical navigation) is a high-resolution camera modeled after NASA’s New Horizons spacecraft imager that returned the first close-up images of the Pluto system and an object in the Kuiper belt, Arrokoth. As DART’s sole instrument, DRACO will capture images of the asteroid Didymos and its lunar asteroid Dimorphos, and support the spacecraft’s autonomous guidance system to direct DART to its final kinetic impact.
DART was developed and is maintained by Johns Hopkins APL for NASA’s Planetary Defense Coordination Office. DART is the world’s first planetary defense test mission, intentionally performing a kinetic impact on Dimorphos to slightly alter its motion in space. Although none of the asteroids pose a threat to Earth, the DART mission will demonstrate that a spacecraft can autonomously navigate to a kinetic impact on a relatively small target asteroid, and this is a technique viable to deflect a truly dangerous asteroid, should one ever be discovered. . DART will reach its goal on September 26, 2022.
The launch of the double asteroid redirect test could be a key step in planetary defense
For more information on the DART mission, see www.nasa.gov/dartmission
NASA Goddard Space Flight Center
With its unique “eye”, NASA’s DART returns the first images from space (2021, December 29)
retrieved December 29, 2021
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