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

  1. #31
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    NASA on what they will be doing over the next few months as they approach Bennu.

    https://www.nasa.gov/feature/goddard...tions-campaign

    During the mission’s approach phase, OSIRIS-REx will:

    regularly observe the area around the asteroid to search for dust plumes and natural satellites, and study Bennu’s light and spectral properties;
    execute a series of four asteroid approach maneuvers, beginning on Oct. 1, slowing the spacecraft to match Bennu's orbit around the Sun;
    jettison the protective cover of the spacecraft’s sampling arm in mid-October and subsequently extend and image the arm for the first time in flight; and
    use OCAMS to reveal the asteroid’s overall shape in late-October and begin detecting Bennu’s surface features in mid-November.
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  2. #32
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    OSIRIS-REx has started adjusting its approach to asteroid Bennu.

    http://www.spacedaily.com/reports/NA...euver_999.html

    NASA's OSIRIS-REx spacecraft executed its first Asteroid Approach Maneuver (AAM-1) today putting it on course for its scheduled arrival at the asteroid Bennu in December.

    The spacecraft's main engine thrusters fired in a braking maneuver designed to slow the spacecraft's speed relative to Bennu from approximately 1,100 mph (491 m/sec) to 313 mph (140 m/sec).

    The mission team will continue to examine telemetry and tracking data as they become available and will have more information on the results of the maneuver over the next week.
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  3. #33
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    OSIRIS-REx is less than 100,000km from Bennu.

    https://www.cnet.com/news/nasa-osiri...-target-bennu/

    Officially beginning "Asteroid Operations" in August, NASA's asteroid chasing spacecraft is slowing itself down for its arrival at asteroid Bennu on Dec. 3. In the meantime, NASA has provided a "tale of the tape" for its approach -- a series of images stitched together that documents OSIRIS-REx's approach.

    Shot between Aug. 17 and Oct. 1, OSIRIS-REx's PolyCam imager snapped the obsidian black of the cosmos and a tiny, slowly brightening spot of light: 101955 Bennu. Over that period the spacecraft moved from 2.2 million kilometres away to a measly (in space terms) 192,000 kilometres, taking a snapshot every Monday, Wednesday and Friday (asteroid chasers -- and their engineers -- need weekends, too). That decreasing distance saw Bennu grow from 0.017 pixels to a whopping 0.19 pixels in size, giving us the following enticing but grainy photoset below.
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  4. #34
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    "NASA's OSIRIS-REx executes second asteroid approach maneuver"

    http://www.spacedaily.com/reports/NA...euver_999.html

    NASA's OSIRIS-REx spacecraft executed its second Asteroid Approach Maneuver (AAM-2). The spacecraft's main engine thrusters fired in a braking maneuver designed to slow the spacecraft's speed relative to Bennu from 315 mph (141 m/sec) to 11.8 mph (5.2 m/sec).

    Likewise, the spacecraft's approach speed dropped from nearly 7,580 miles (12,200 km) to 280 miles (450 km) per day.

    The mission team will continue to examine telemetry and tracking data and will have more information over the next week. This burn marked the last planned use of the spacecraft's main engines prior to OSIRIS-REx's departure from Bennu in March 2021.
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  5. #35
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    "OSIRIS-REx captures 'super-resolution' view of Bennu"

    http://www.spacedaily.com/reports/OS...Bennu_999.html

    This "super-resolution" view of asteroid Bennu was created using eight images obtained by NASA's OSIRIS-REx spacecraft on Oct. 29, 2018, from a distance of about 205 miles (330 km).

    The spacecraft was moving as it captured the images with the PolyCam camera, and Bennu rotated 1.2 degrees during the nearly one minute that elapsed between the first and the last snapshot.

    The team used a super-resolution algorithm to combine the eight images and produce a higher resolution view of the asteroid. Bennu occupies about 100 pixels and is oriented with its north pole at the top of the image.
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  6. #36
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    Quote Originally Posted by selvaarchi View Post
    "OSIRIS-REx captures 'super-resolution' view of Bennu"

    http://www.spacedaily.com/reports/OS...Bennu_999.html
    Looks like Ryugus twin.

  7. #37
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    Quote Originally Posted by Superluminal View Post
    Looks like Ryugus twin.
    I disagree, this one looks more like solid body whereas Ryugus looked like a "ball" of rubble.

  8. #38
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    Both are roughly diamond shape.

    And right when I got used to seeing contact binary potatoes

  9. #39
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    "NASA's OSIRIS-REx executes fourth asteroid approach maneuver"

    http://www.spacedaily.com/reports/NA...euver_999.html

    NASA's OSIRIS-REx spacecraft executed its fourth Asteroid Approach Maneuver (AAM-4) yesterday. The spacecraft fired its Attitude Control System (ACS) thrusters to slow the spacecraft from approximately 0.31 mph (0.14 m/sec) to 0.10 mph (0.04 m/sec).

    The ACS thrusters are capable of velocity changes as small as 0.02 mph (0.01 m/sec).

    The mission team will continue to examine telemetry and tracking data over the next week to verify the new trajectory. The maneuver targeted the spacecraft to fly through a corridor designed for the collection of high-resolution images that will be used to build a shape model of Bennu.
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  10. #40
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    "WATCH LIVE: NASA OSIRIS-REX ARRIVES AT ASTEROID BENNU"

    https://www.wired.com/story/osiris-rex-bennu-arrival/

    But before anyone can sift through a sample from Bennu, NASA must first collect and retrieve it. Doing so will require several major steps, the first of which is slated to kick off Monday, at around 9:00 am PT, when OSIRIS-REx (short for Origins, Spectral Interpretation, Resource Identification, Security-Regolith Explorer) will arrive at Bennu and begin its months-long process of surveying the asteroid's surface. You can watch the arrival on NASA TV (above), where the agency will be broadcasting live from mission control between 11:45 am and 12:15 pm ET. NASA will also air an arrival preview program beginning at 11:15 am ET.
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  11. #41
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    OSIRIS-REx has successfully arrived at Bennu. Congratulations NASA
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  12. #42
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    The Planetary Society carries an article on the arrival.

    http://www.planetary.org/blogs/jason...x-arrival.html

    After a 2-billion-kilometer journey that began in September 2016, NASA's OSIRS-REx spacecraft has safely arrived at asteroid Bennu. At 17:00 UTC, with the spacecraft just 20 kilometers away from its 500-meter-wide target asteroid, OSIRIS-REx lit its engines for a 20-second burn that put it on course for an initial close flyby of Bennu's north pole tomorrow.

    "We know the burn is occurring," said Javi Cerna, an OSIRIS-REx telecom engineer, during a NASA TV broadcast from Lockheed Martin in Littleton, Colorado. Cerna watched his computer screen closely as the spacecraft's radio frequency shifted, indicating a change in velocity. "We have arrived!" he called out moments later.

    Back at the University of Arizona, which is leading the mission, a crowd watching at the Stevie Eller Dance Theater broke into cheers. Dante Lauretta, the mission's principal investigator, told reporters later that the burn appeared to have gone well, but he was eager to read the navigation report, which was probably waiting in his inbox.
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  13. #43
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    OSIRIS-REx finds water on asteroid Bennu.

    http://www.planetary.org/blogs/jason...-on-bennu.html

    OSIRIS-REx team members held a press briefing today at the 2018 American Geophysical Union meeting, and announced that the mission has already found water on asteroid Bennu. The water is locked in clay minerals, and was detected with the spacecraft’s OVIRS and OTES instruments. The signature was strong enough to be detected while OSIRIS-REx was still approaching Bennu, which was a bit of a surprise, according to NASA Goddard's Amy Simon.

    Bennu was chosen specifically because it was suspected to have both water and organic materials — important building blocks for life — so today’s announcement checks off an important mission milestone. Organics have not yet been found.
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  14. #44
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    Emily Lakdawalla on OSIRIS-REx arrival at Bennu.

    http://www.planetary.org/blogs/emily...rex-orbit.html

    Today at 19:43 UTC, OSIRIS-REx entered orbit at asteroid Bennu. In so doing, it accomplished both the tightest orbit (at an altitude under 2 kilometers) and the orbit of the smallest object ever. Read more at the OSIRIS-REx website.

    The arrival at orbit marks the end of the Preliminary Survey phase of the mission and the beginning of the "Orbital A" phase. As I explained in this blog entry about the OSIRIS-REx mission timeline, the first orbit will be in the same plane as the terminator (so, over the poles along the line separating day from night). The alignment with the terminator is to make it so there will be no net effect of solar radiation pressure on the spacecraft's orbit. During Orbital Phase A, the team will work on switching over from using stars as their navigational reference to using surface features as their navigational reference, which will be more precise. The next phase, Detailed Survey, begins in February.
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  15. #45
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    Cool image of Earth, Moon and Bennu all in the same image.

  16. #46
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    OSIRIS-REx is in a stable orbit around Bennu.

    http://www.planetary.org/blogs/jason...orbital-a.html

    NASA's OSIRIS-REx spacecraft is performing well as mission controllers monitor its extremely close orbit around asteroid Bennu. Meanwhile, mission principal investigator Dante Lauretta tells The Planetary Society his team has yet to find a sample collection site on the rocky asteroid that matches their pre-arrival expectations, meaning their plans will probably have to change.
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  17. #47
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    We have names for some of the locations on the surface of Ryugu.

    http://www.spacedaily.com/reports/Lo...named_999.html

    Place names for locations on the surface of Ryugu were discussed by Division F (Planetary Systems and Bioastronomy) of the International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (hereafter IAU WG) and approved in December 2018. We will introduce the place names in this article and the background to their selection.

    As the appearance of Ryugu gradually became clear during the approach phase in June 2018, we used nicknames amongst the Hayabsua2 Project team to distinguish regions of the terrain. (For example, the crater now named "Urashima" was referred to as the Death Star crater in Star Wars!) However, in order to introduce Ryugu to the world, it is necessary to have names that are intentionally recognized rather than nicknames, which can be referred to in scientific papers and other articles. Therefore, the discussion regarding naming the Ryugu surface topology began within the team.
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  18. #48
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    3 images of asteroid Bennu's northern hemisphere.

    http://www.spacedaily.com/reports/OS...phere_999.html

    This trio of images acquired by NASA's OSIRIS-REx spacecraft shows a wide shot and two close-ups of a region in asteroid Bennu's northern hemisphere.
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  19. #49
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    OSIRIS-REx spots Bennu spewing stuff into space.

    http://www.planetary.org/blogs/jason...-ejection.html

    Asteroid Bennu regularly ejects surface particles into space, scientists from NASA's OSIRIS-REx mission announced today. The discovery puts Bennu in a class of so-called "active asteroids," and marks the first time a spacecraft has ever seen the phenomenon first-hand. Principal investigator Dante Lauretta called the discovery "one of the biggest surprises of my scientific career." Mission scientists also provided updates on Bennu's rotation rate and the plan to collect a sample of regolith from the surface next year.
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  20. #50
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    "NASA says taking sample from asteroid harder than expected"

    http://www.spacedaily.com/afp/190319....8zdvq1qp.html

    After two years crossing the solar system, the NASA space probe Osiris-Rex arrived last December near the asteroid Bennu to complete its mission of collecting a sample -- but touching the rock will prove much harder than scientists had expected.
    The Osiris-Rex team said Tuesday that the surface of the asteroid, which measures 490 meters (1,600 feet) in diameter, was covered in stones and boulders. They had expected it to be smoother and easier for the probe to touch.

    "We go back to the drawing board and start thinking again," Dante Lauretta, the head of the mission, told a press conference. The team's observations also appeared in the Nature journal on Tuesday.
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  21. #51
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    "Bennu in Stereo"

    http://www.spacedaily.com/reports/Be...tereo_999.html

    This set of stereoscopic images provides a 3D view of the large, 170-foot (52-meter) boulder that juts from asteroid Bennu's southern hemisphere and the rocky slopes that surround it.

    The stereo pair was created by stereo image processing scientists Dr. Brian May, who is also the lead guitarist for the rock band Queen, and Claudia Manzoni. In January, May and Manzoni formally joined NASA's OSIRIS-REx mission science team as collaborators to create stereoscopic data products, which will be used by the team while selecting a sample collection site on Bennu.
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  22. #52
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    "Here's a Roundup of Recent OSIRIS-REx Postcards from Bennu"

    http://www.planetary.org/blogs/jason...d-roundup.html

    NASA's OSIRIS-REx spacecraft is continuing to chug along at asteroid Bennu. It’s currently sweeping arcs between the asteroid's north and south poles, gathering scientific data that will also be used to select 12 possible sites for sample collection. The OSIRIS-REx team has also been releasing stunning new images from the mission's prior phase.
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  23. #53
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    A ball of rocks held together by gravity. I hope that the probe was designed to through this surface rubble and actually sample deeper, but who knows maybe deeper is a continuation of the rubble.

  24. #54
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    OSIRIS-REx spacecraft snaps detailed asteroid picture from closest orbit yet.

    https://www.theverge.com/2019/6/17/1...st-orbit-bennu

    NASA’s asteroid-sampling spacecraft OSIRIS-REx just snapped its closest picture yet of Bennu, the deep-space rock it’s been hovering around since the end of last year. The high-resolution image highlights the object’s very rocky surface and even showcases a very large boulder on its southern half.

    OSIRIS-REx took this up-close picture on June 13th, right after the spacecraft inserted itself into orbit around Bennu for the second time. The vehicle first got into Bennu’s orbit on December 31st, 2018, flying about a mile away from the asteroid’s surface. From that path, OSIRIS-REx mapped Bennu’s surface in intricate detail, and also observed some interesting things from this vantage point, including rocks spewing from Bennu’s surface.

    OSIRIS-REx is still mapping Bennu, and last week, its mission team maneuvered the spacecraft even closer to the asteroid. Now, OSIRIS-REx is orbiting within just 0.4 miles of Bennu’s surface, which is less than the height of the Burj Khalifa in Dubai. That’s the closest orbit that any spacecraft has ever achieved around another space object. And that makes the picture that OSIRIS-REx snapped above the closest image ever taken of an orbiting spacecraft.
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  25. #55
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    "OSIRIS-REx Team Picks 4 Candidate Sample Sites on Asteroid Bennu"

    http://www.planetary.org/blogs/jason...ple-sites.html

    The science team for NASA's OSIRIS-REx mission has compiled a list of 4 candidate sample sites on asteroid Bennu, one of which will be the touchdown spot for the spacecraft next year. It's an important milestone for OSIRIS-REx, which (like Japan's Hayabusa2 spacecraft at asteroid Ryugu) has had to adjust its plans after discovering a much rockier surface than anticipated. The OSIRIS-REx team will spend 4 months observing the 4 sites before picking a primary and backup sample site in December.
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