OSIRIS REx Asteroid sample and return mission

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Re: OSIRIS REx Asteroid sample and return mission

Unread postby allynh » Fri Dec 14, 2018 12:52 pm

D_Archer wrote:-comment, at first i thought with scooping they meant actually scooping, but picking up up rocks is something else, should be possible, but not if there are only really big rocks... a weak grabbing arm does not help..

They have a video of how they are going to collect the sample.

TAGSAM Taking a Sample
https://www.youtube.com/watch?v=5JkB_lXrJFo

They are going to blast nitrogen onto the dust and catch the dust as it blows through the filters.

To have that work, there must be dust to blow. HA!
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Re: OSIRIS REx Asteroid sample and return mission

Unread postby D_Archer » Sat Dec 15, 2018 2:39 am

allynh wrote:
D_Archer wrote:-comment, at first i thought with scooping they meant actually scooping, but picking up up rocks is something else, should be possible, but not if there are only really big rocks... a weak grabbing arm does not help..

They have a video of how they are going to collect the sample.

TAGSAM Taking a Sample
https://www.youtube.com/watch?v=5JkB_lXrJFo

They are going to blast nitrogen onto the dust and catch the dust as it blows through the filters.

To have that work, there must be dust to blow. HA!


Thx,that is more vacuum cleaning, .. but yeah there should/could be dust a plenty.

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Re: OSIRIS REx Asteroid sample and return mission

Unread postby GaryN » Wed Jan 09, 2019 4:17 pm

There are some more images from the polycam available lower down the page:

OSIRIS-REx Arrives at Bennu -- 2018 AGU Press Conference
https://svs.gsfc.nasa.gov/12658
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Re: OSIRIS REx Asteroid sample and return mission

Unread postby allynh » Thu Jan 10, 2019 12:09 pm

Great overview of the various programs.

When they keep mentioning the myth/dogma of "studying the early solar system" when looking at these rocks, it is part of their funding narrative.

If they said, "We want to spend a billion dollars to go look at this rock", they would be told, "No". They need to use an intriguing narrative to get the funding. All this despite having spent thirty years visiting various rocks and seeing only rocks, not "dirty snowballs" from the distance past.

- One of the key points they mention, is that most of the pictures are assembled from a mosaic of individual pictures. That is evocative.

BTW, The pictures of the boulder piles are deeply scary. HA!

Thanks for the link.
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Re: OSIRIS REx Asteroid sample and return mission

Unread postby Cargo » Thu Jan 10, 2019 5:11 pm

WoW. Great Pictures. Strange that the 'cracks' in the fractured bolder point towards the bolder 'pile'. :)
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Re: OSIRIS REx Asteroid sample and return mission

Unread postby D_Archer » Fri Jan 11, 2019 4:09 am

yeah, some big boulders there.

I liked the thermal image* best, it can give indication of where/how the charge field is recycled by the asteroid.

*https://svs.gsfc.nasa.gov/vis/a010000/a012600/a012658/Slide25.jpeg

--

A few pictures later there is a picture of crater*, this is not impact but really electric, looks recent and like 'soft' action, where dust is moved electrically by impinging currents/charge. Also it is hexagonal.

*https://svs.gsfc.nasa.gov/vis/a010000/a012600/a012658/Slide35.jpeg

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Re: OSIRIS REx Asteroid sample and return mission

Unread postby allynh » Tue Apr 23, 2019 1:42 pm

I don't see a clear place for them to touch and get a sample. Yikes!

A Region of Bennu’s Northern Hemisphere Close Up
https://www.nasa.gov/image-feature/godd ... e-close-up
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. The wide-angle image (left), obtained by the spacecraft’s MapCam camera, shows a 590-foot (180-meter) wide area with many rocks, including some large boulders, and a “pond” of regolith that is mostly devoid of large rocks. The two closer images, obtained by the high-resolution PolyCam camera, show details of areas in the MapCam image, specifically a 50-foot (15 meter) boulder (top) and the regolith pond (bottom). The PolyCam frames are 101 feet (31 meters) across and the boulder depicted is approximately the same size as a humpback whale.

The images were taken on February 25 while the spacecraft was in orbit around Bennu, approximately 1.1 miles (1.8 km) from the asteroid’s surface. The observation plan for this day provided for one MapCam and two PolyCam images every 10 minutes, allowing for this combination of context and detail of Bennu’s surface.

Now this next part is deeply disturbing, "Particle plumes"? Yikes!

NASA Mission Reveals Asteroid Has Big Surprises
https://www.nasa.gov/press-release/nasa ... -surprises
This view of asteroid Bennu ejecting particles from its surface on January 19 was created by combining two images taken on board NASA’s OSIRIS-REx spacecraft. Other image processing techniques were also applied, such as cropping and adjusting the brightness and contrast of each image.

NASA spacecraft that will return a sample of a near-Earth asteroid named Bennu to Earth in 2023 made the first-ever close-up observations of particle plumes erupting from an asteroid’s surface. Bennu also revealed itself to be more rugged than expected, challenging the mission team to alter its flight and sample collection plans, due to the rough terrain.

Bennu is the target of NASA’s Origins, Spectral Interpretation, Resource Identification, Security-Regolith Explorer (OSIRIS-REx) mission, which began orbiting the asteroid on Dec. 31. Bennu, which is only slightly wider than the height of the Empire State Building, may contain unaltered material from the very beginning of our solar system.

“The discovery of plumes is one of the biggest surprises of my scientific career,” said Dante Lauretta, OSIRIS-REx principal investigator at the University of Arizona, Tucson. “And the rugged terrain went against all of our predictions. Bennu is already surprising us, and our exciting journey there is just getting started.”

Shortly after the discovery of the particle plumes on Jan. 6, the mission science team increased the frequency of observations, and subsequently detected additional particle plumes during the following two months. Although many of the particles were ejected clear of Bennu, the team tracked some particles that orbited Bennu as satellites before returning to the asteroid’s surface.

The OSIRIS-REx team initially spotted the particle plumes in images while the spacecraft was orbiting Bennu at a distance of about one mile (1.61 kilometers). Following a safety assessment, the mission team concluded the particles did not pose a risk to the spacecraft. The team continues to analyze the particle plumes and their possible causes.

“The first three months of OSIRIS-REx’s up-close investigation of Bennu have reminded us what discovery is all about — surprises, quick thinking, and flexibility,” said Lori Glaze, acting director of the Planetary Science Division at NASA Headquarters in Washington. “We study asteroids like Bennu to learn about the origin of the solar system. OSIRIS-REx’s sample will help us answer some of the biggest questions about where we come from.”

OSIRIS-REx launched in 2016 to explore Bennu, which is the smallest body ever orbited by spacecraft. Studying Bennu will allow researchers to learn more about the origins of our solar system, the sources of water and organic molecules on Earth, the resources in near-Earth space, as well as improve our understanding of asteroids that could impact Earth.

The OSIRIS-REx team also didn’t anticipate the number and size of boulders on Bennu’s surface. From Earth-based observations, the team expected a generally smooth surface with a few large boulders. Instead, it discovered Bennu’s entire surface is rough and dense with boulders.

The higher-than-expected density of boulders means that the mission’s plans for sample collection, also known as Touch-and-Go (TAG), need to be adjusted. The original mission design was based on a sample site that is hazard-free, with an 82-foot (25-meter) radius. However, because of the unexpectedly rugged terrain, the team hasn’t been able to identify a site of that size on Bennu. Instead, it has begun to identify candidate sites that are much smaller in radius.

The smaller sample site footprint and the greater number of boulders will demand more accurate performance from the spacecraft during its descent to the surface than originally planned. The mission team is developing an updated approach, called Bullseye TAG, to accurately target smaller sample sites.

“Throughout OSIRIS-REx’s operations near Bennu, our spacecraft and operations team have demonstrated that we can achieve system performance that beats design requirements,” said Rich Burns, the project manager of OSIRIS-REx at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “Bennu has issued us a challenge to deal with its rugged terrain, and we are confident that OSIRIS-REx is up to the task.”

The original, low-boulder estimate was derived both from Earth-based observations of Bennu’s thermal inertia — or its ability to conduct and store heat — and from radar measurements of its surface roughness. Now that OSIRIS-REx has revealed Bennu’s surface up close, those expectations of a smoother surface have been proven wrong. This suggests the computer models used to interpret previous data do not adequately predict the nature of small, rocky, asteroid surfaces. The team is revising these models with the data from Bennu.

The OSIRIS-REx science team has made many other discoveries about Bennu in the three months since the spacecraft arrived at the asteroid, some of which were presented Tuesday at the 50th Lunar and Planetary Conference in Houston and in a special collection of papers issued by the journal Nature.

The team has directly observed a change in the spin rate of Bennu as a result of what is known as the Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect. The uneven heating and cooling of Bennu as it rotates in sunlight is causing the asteroid to increase its rotation speed. As a result, Bennu's rotation period is decreasing by about one second every 100 years. Separately, two of the spacecraft’s instruments, the MapCam color imager and the OSIRIS-REx Thermal Emission Spectrometer (OTES), have made detections of magnetite on Bennu’s surface, which bolsters earlier findings indicating the interaction of rock with liquid water on Bennu’s parent body.

Goddard provides overall mission management, systems engineering, and the safety and mission assurance for OSIRIS-REx. Dante Lauretta of the University of Arizona, Tucson, is the principal investigator, and the University of Arizona also leads the science team and the mission’s science observation planning and data processing. Lockheed Martin Space in Denver built the spacecraft and is providing flight operations. Goddard and KinetX Aerospace are responsible for navigating the OSIRIS-REx spacecraft. OSIRIS-REx is the third mission in NASA’s New Frontiers Program, which is managed by NASA’s Marshall Space Flight Center in Huntsville, Alabama, for the agency’s Science Mission Directorate in Washington.

To find out more about the OSIRIS-REx mission, visit:

https://www.nasa.gov/osiris-rex

-end-

Last Updated: March 19, 2019

Editor: Sean Potter

Then they did something I haven't seen before.

OSIRIS-REx Captures Laser 3D View of Bennu
https://www.nasa.gov/image-feature/godd ... w-of-bennu

This is the color gif they mention.

https://www.nasa.gov/sites/default/file ... nuola1.gif
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Re: OSIRIS REx Asteroid sample and return mission

Unread postby GaryN » Wed Jun 05, 2019 1:18 pm

New Electrostatic Charge Models Show Dust Lofting at Ryugu and Bennu.
https://www.hou.usra.edu/meetings/lpsc2019/pdf/2136.pdf
In order to change an existing paradigm you do not struggle to try and change the problematic model. You create a new model and make the old one obsolete. -Buckminster Fuller
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