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posted by martyb on Sunday November 04 2018, @12:51AM   Printer-friendly
from the "space-rock-trio"-sounds-like-the-name-of-a-band dept.

Another Space Diamond! NASA Probe Snaps Great Photo of Asteroid Bennu

The asteroid Bennu is really coming into focus for NASA's approaching OSIRIS-REx spacecraft.

OSIRIS-REx snapped eight photos of the 1,650-foot-wide (500 meters) Bennu on Monday (Oct. 29), when the probe was about 205 miles (330 kilometers) away from the space rock. Mission team members combined these images into a single "super-resolution" shot, which reveals boulders and other features on the asteroid's surface.

The striking photo also highlights Bennu's diamond shape, which is similar to that of the 3,000-foot-wide (900 m) asteroid Ryugu. Japan's Hayabusa2 mission has been orbiting Ryugu since late June and has dropped three separate landing craft onto the space rock's surface over the past five weeks.

101955 Bennu has an average diameter of 492 meters, compared to about 1 kilometer for 162173 Ryugu. New Horizons will fly by (486958) 2014 MU69, a 30-40 km object or objects, on January 1, capping the space rock trio for the year.

NASA/Goddard/University of Arizona photo.

Previously: New Horizons Spacecraft Approaches 2014 MU69; OSIRIS-REx Nears 101955 Bennu (images taken from 2.2 million km away)

Related: Hayabusa2 Reaches Asteroid 162173 Ryugu
Japan's Hopping Rovers Capture Amazing Views of Asteroid Ryugu
Short-Lived MASCOT Lander Reaches Asteroid Ryugu


Original Submission

Related Stories

Hayabusa2 Reaches Asteroid 162173 Ryugu 11 comments

JAXA's Hayabusa2 spacecraft has begun orbiting asteroid 162173 Ryugu at a distance of about 20 kilometers:

JAXA confirmed Hayabusa2, JAXA's asteroid explorer rendezvoused with Ryugu, the target asteroid.

On June 27, 2018, JAXA operated Hayabusa2 chemical propulsion thrusters for the spacecraft's orbit control.*

The confirmation of the Hayabusa2 rendezvous made at 9:35 a.m. (Japan Standard Time, JST) is based on the following data analyses;

·The thruster operation of Hayabusa2 occurred nominally
·The distance between Hayabusa2 and Ryugu is approximately 20 kilometers
·Hayabusa2 is able to maintain a constant distance to asteroid Ryugu
·The status of Hayabusa2 is normal

Also at Spaceflight Now.

Previously: Hayabusa2 Approaches Asteroid Ryugu


Original Submission

New Horizons Spacecraft Approaches 2014 MU69; OSIRIS-REx Nears 101955 Bennu 13 comments

NASA's New Horizons spacecraft has imaged 2014 MU69, nicknamed Ultima Thule, from about 172 million kilometers away:

Mission team members were thrilled – if not a little surprised – that New Horizons' telescopic Long Range Reconnaissance Imager (LORRI) was able to see the small, dim object while still more than 100 million miles away, and against a dense background of stars. Taken Aug. 16 and transmitted home through NASA's Deep Space Network over the following days, the set of 48 images marked the team's first attempt to find Ultima with the spacecraft's own cameras.

[...] This first detection is important because the observations New Horizons makes of Ultima over the next four months will help the mission team refine the spacecraft's course toward a closest approach to Ultima, at 12:33 a.m. EST on Jan. 1, 2019. That Ultima was where mission scientists expected it to be – in precisely the spot they predicted, using data gathered by the Hubble Space Telescope – indicates the team already has a good idea of Ultima's orbit.

Meanwhile, the OSIRIS-REx spacecraft is approaching 101955 Bennu, and has taken a series of images from a distance of about 2.2 million kilometers:

After arrival at Bennu, the spacecraft will spend the first month performing flybys of Bennu's north pole, equator and south pole, at distances ranging between 11.8 and 4.4 miles (19 and 7 km) from the asteroid. These maneuvers will allow for the first direct measurement of Bennu's mass as well as close-up observations of the surface. These trajectories will also provide the mission's navigation team with experience navigating near the asteroid.

"Bennu's low gravity provides a unique challenge for the mission," said Rich Burns, OSIRIS-REx project manager at NASA's Goddard Space Flight Center in Greenbelt, Maryland. "At roughly 0.3 miles [500 meters] in diameter, Bennu will be the smallest object that any spacecraft has ever orbited."


Original Submission

Japan's Hopping Rovers Capture Amazing Views of Asteroid Ryugu 15 comments

Japan's Hopping Rovers Capture Amazing Views of Asteroid Ryugu (Video)

Two tiny, hopping rovers that landed on asteroid Ryugu last week have beamed back some incredible new views of the asteroid's rocky surface.

The Japanese Aerospace Exploration Agency's (JAXA) Hayabusa2 sample-return mission dropped the two nearly identical rovers, named Minerva-II1A and Minerva-II1B, onto the surface of Ryugu on Sept. 21. In a new video from the eyes of Minerva-II1B, you can watch the sun move across the sky as its glaring sunlight reflects off the shiny rocks that cover Ryugu's surface.

Also at Hayabusa2 project website.

takyon: Additionally, the Hayabusa2 spacecraft has returned its highest resolution view of Ryugu, from when it dropped the Minerva rovers.


Original Submission

Short-Lived MASCOT Lander Reaches Asteroid Ryugu 4 comments

Japanese spacecraft drops box-shaped robot on asteroid's surface

Overnight, Japan's asteroid-sampling spacecraft Hayabusa2 deployed its third robot onto the surface of an asteroid named Ryugu more than 186 million miles from Earth. This time, the robotic explorer is a tiny, box-shaped lander crafted by Germany and France's space agencies, dubbed MASCOT. While on the asteroid, the robot will hop around slowly and study the surface in detail, measuring things like temperature and the composition of nearby rocks.

[...] MASCOT is also able to move around in a similar way to Rover-1A and Rover-1B. In fact, engineers already opted to move the lander once it had reached the surface last night because they found that it was sitting at a bad angle. The mission team switched on MASCOT's mobility system, shifting the robot's position and placing it in a much more favorable orientation. The German space agency DLR says that now all of MASCOT's instruments are working just fine and are continuing to collect data.

The lander has a suite of four instruments on board to characterize Ryugu. These will allow MASCOT to take pictures, measure temperatures, figure out the different minerals on the asteroid, and measure the space rock's magnetic field. However, MASCOT's time on the surface of Ryugu is limited. It doesn't have any solar panels, so it's operating entirely off of an internal battery that lasts just 16 hours. The mission team says that, as of this morning, the lander has under seven hours left to complete its work.

Also at NPR.

Previously: Hayabusa2 Reaches Asteroid 162173 Ryugu
Japan's Hopping Rovers Capture Amazing Views of Asteroid Ryugu


Original Submission

NASA's OSIRIS-REx "Arrives" at Asteroid Bennu 4 comments

NASA's Osiris-Rex Arriving at Asteroid Bennu After a Two-Year Journey

Launched two years ago, NASA's Osiris-Rex spacecraft arrives at the asteroid Bennu on Monday. Its mission is to survey the asteroid ahead of retrieving pristine bits of the solar system from the rock's surface and then bringing them back to Earth in the years ahead.

[...] Osiris-Rex is pulling in at a modest speed, and the moment of arrival is a somewhat arbitrary designation. The spacecraft started the approach phase of its mission in August when it was 1.2 million miles from Bennu. On Monday, it will be 12 miles away, although still too far away to orbit the asteroid. There should be no drama. It should be just a smooth transition to the next phase of the mission.

Osiris-Rex will make a series of passes over the asteroid at a range of 4.3 miles for an initial survey to better determine its mass, rate of spin and shape. In January, the spacecraft will get closer to Bennu, between 0.9 and 1.2 miles, and be drawn into orbit around the asteroid. It will then spend more than a year performing reconnaissance of Bennu before attempting to bounce off the surface and collect a sample of the asteroid in mid-2020.

OSIRIS-REx and 101955 Bennu.

Previously: New Horizons Spacecraft Approaches 2014 MU69; OSIRIS-REx Nears 101955 Bennu
OSIRIS-REx Approaches Bennu, Sends Photo Captured at a Distance of 330 km


Original Submission

NASA’s OSIRIS-REx Completes Final Tour of Asteroid Bennu 5 comments

NASA reports, via NASA, that OSIRIS-REx is leaving Bennu.

NASA's OSIRIS-REx completed its last flyover of Bennu around 6 a.m. EDT (4 a.m. MDT) April 7 and is now slowly drifting away from the asteroid; however, the mission team will have to wait a few more days to find out how the spacecraft changed the surface of Bennu when it grabbed a sample of the asteroid.

The OSIRIS-REx team added this flyby to document surface changes resulting from the Touch and Go (TAG) sample collection maneuver Oct. 20, 2020. "By surveying the distribution of the excavated material around the TAG site, we will learn more about the nature of the surface and subsurface materials along with the mechanical properties of the asteroid," said Dr. Dante Lauretta, principal investigator for OSIRIS-REx at the University of Arizona.

During the flyby, OSIRIS-REx imaged Bennu for 5.9 hours, covering more than a full rotation of the asteroid. It flew within 2.1 miles' (3.5 kilometers) distance to the surface of Bennu – the closest it's been since the TAG sample collection event.

Just to mention, the survey and selection of a sampling site was one of the recent "citizen science" projects.

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  • (Score: 2) by Runaway1956 on Sunday November 04 2018, @01:52AM (1 child)

    by Runaway1956 (2926) Subscriber Badge on Sunday November 04 2018, @01:52AM (#757470) Journal

    Following links from this page, you can see how the "hoppers" hop around the surface of the asteroid. - https://www.space.com/42304-asteroid-bennu-diamond-photo-nasa-osiris-rex.html [space.com]
    That may be the coolest part of the whole mission. I suppose that any human who found themselves in such a microgravity environment could have worked out that movement pretty quickly. But extra points for figuring it out here on earth!! The German lander uses a similar method, but they also have backup methods, which is even more awesome.

    So, now the asteroid has fleas? Hop, hop, hop!

    • (Score: 2) by takyon on Sunday November 04 2018, @03:10AM

      by takyon (881) <reversethis-{gro ... s} {ta} {noykat}> on Sunday November 04 2018, @03:10AM (#757487) Journal

      The microgravity environment makes it a necessity. Looks like Ryugu experiences an estimated 1/80,000 g (could depend wildly on your location on the asteroid). Bennu is at 1/100,000 g.

      Things start to look more normal (or at least Moon-like) for the very largest asteroids. Vesta has 2.5% of Earth's gravity, while Ceres has a whopping 2.9%.

      --
      [SIG] 10/28/2017: Soylent Upgrade v14 [soylentnews.org]
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