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Thread: Osiris-Rex mission to bring back samples from astroid Bennu

  1. #61
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    "OSIRIS-REx swoops over sample site Osprey"

    https://www.spacedaily.com/reports/O...sprey_999.html

    This view of sample site Osprey on asteroid Bennu is a mosaic of images collected by NASA's OSIRIS-REx spacecraft on May 26. A total of 347 PolyCam images were stitched together and corrected to produce the mosaic, which shows the site at 0.2 inches (5 mm) per pixel at full size.

    The spacecraft took these images during an 820-foot (250-meter) reconnaissance pass over the site, which is the closest Osprey has been imaged. The pass was designed to provide high-resolution imagery to identify the best areas within the site to collect a sample.
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  2. #62
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    "OSIRIS-REx finds heat, cold fracturing rocks on Asteroid Bennu"

    https://www.spacedaily.com/reports/O...Bennu_999.html

    Close-up observations of asteroid Bennu by NASA's OSIRIS-REx spacecraft contain the first evidence of thermal fracturing of rocks on an airless body, a Nature Communications paper by Planetary Science Institute Research Scientist Jamie Molaro says.

    Thermal fracturing or thermal stress weathering occurs as rocks heat and cool each day, and mechanical stresses build up that can cause cracks to develop and grow. Over time the cracks grow larger and cause the rock to disaggregate or split into multiple pieces.
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  3. #63
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    "NASA's OSIRIS-REx produces Nightingale mosaic"

    https://www.spacedaily.com/reports/N...osaic_999.html

    This view of sample site Nightingale on asteroid Bennu is a mosaic of images collected by NASA's OSIRIS-REx spacecraft on March 3. A total of 345 PolyCam images were stitched together to produce the mosaic, which shows the site at 0.2 inches (4 mm) per pixel at full size.

    These images were captured when the spacecraft performed an 820-foot (250-meter) reconnaissance pass over site Nightingale, which at the time was the closest the site had been imaged. The low-altitude pass provided high-resolution imagery for the OSIRIS-REx team to identify the best location within the site to target for sample collection.
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  4. #64
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    The BENNU GLOBAL MOSAIC is in the news again—

  5. #65
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    "A Successful Second Rehearsal Puts NASA’s OSIRIS-REx on a Path to Sample Collection"

    https://www.nasa.gov/feature/goddard...ple-collection

    Yesterday, the OSIRIS-REx spacecraft performed its final practice run of the sampling sequence, reaching an approximate altitude of 131 feet (40 meters) over sample site Nightingale before executing a back-away burn. Nightingale, OSIRIS-REx’s primary sample collection site, is located within a crater in Bennu’s northern hemisphere.

    The approximately four-hour “Matchpoint” rehearsal took the spacecraft through the first three of the sampling sequence’s four maneuvers: the orbit departure burn, the “Checkpoint” burn and the Matchpoint burn. Checkpoint is the point where the spacecraft autonomously checks its position and velocity before adjusting its trajectory down toward the event’s third maneuver. Matchpoint is the moment when the spacecraft matches Bennu’s rotation in order to fly in tandem with the asteroid surface, directly above the sample site, before touching down on the targeted spot.
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  6. #66
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    "Why Is Asteroid Bennu Ejecting Particles Into Space?"

    https://www.jpl.nasa.gov/news/news.php?feature=7743

    When NASA's OSIRIS-REx spacecraft arrived at asteroid (101955) Bennu, mission scientists knew that their spacecraft was orbiting something special. Not only was the boulder-strewn asteroid shaped like a rough diamond, its surface was crackling with activity, shedding small pieces of rock into space. Now, after more than a year and a half up close with Bennu, they're starting to better understand these dynamic particle-ejection events.

    A collection of studies in a special edition of the Journal of Geophysical Research: Planets homes in on the asteroid and these enigmatic particles. The studies provide a detailed look at how these particles act when in space, possible clues as to how they're ejected, and even how their trajectories can be used to approximate Bennu's weak gravitational field.
    I am because we are
    (African saying)

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