IonStorm

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  1. Earth rocks also can show linear cracks, but often with very different types or rocks than Bennu http://maps.unomaha.edu/maher/STEP07/supportinfo/cracks.html There are phyllosilicates (clays) on the surface, they could exhibit a preferred fracture orientation. It may be due to thermal fracturing, and perhaps related to the particle ejection events. So much science to do.
  2. There is still time to count rocks for science! https://bennu.cosmoquest.org/
  3. Here is the real answer:
  4. I'm not sure which image set these are drawn from. A funny thing about fractal rocks is you can't tell the scale by looking at them. I'll need to check with the image team. Anyway, if you can use the boulder tool it is a boulder. If it is too small to draw the line it is a rock.
  5. Thanks! I've elevated your comments and suggestion to the leader the team responsible. Below is the reply: "Interesting.... the whole world is seeing just how many rocks we have to count! It's a good comment - I will pass it along..."
  6. Me too! Thanks for posting, I've gotten busy lately...
  7. Indeed. Though the craters don't appear to scale. There is so much to learn about this scree ball. Except for the isolation and death part, yes.
  8. Here's another Rocks and Boulders near Bennu’s Equator This image shows the rocky surface of Bennu in a region just south of the asteroid’s equator. The PolyCam camera on NASA’s OSIRIS-REx spacecraft took the image on March 7 from a distance of 3 miles (4.8 km). The width of the field of view is 185 ft (56.4 m) of Bennu’s surface. For scale, the cracked rock at the top of the image is 69 ft (21 m) long, which is about the length of four parallel parking spots. The image was obtained during Flyby 1 of the mission’s Detailed Survey: Baseball Diamond phase. Date Taken: Mar. 7, 2019 Instrument Used: OCAMS (PolyCam) Credit: NASA/Goddard/University of Arizona https://www.asteroidmission.org/20190307-polycam-cracked-rock/ and another Northern Boulder Imaged by PolyCam This image shows one of the largest boulders on asteroid Bennu’s northern hemisphere. It was taken on March 7 by the PolyCam camera on NASA’s OSIRIS-REx spacecraft from a distance of 2.9 miles (4.6 km). The field of view in the image is 191 feet (58.2 meters) and the boulder itself measures 77 feet (23.5 meters) on its longest dimension, which is about the same length as one-fourth of an American football field. The image was obtained during Flyby 1 of the mission’s Detailed Survey: Baseball Diamond phase while the spacecraft was flying over Bennu’s equator and pointing PolyCam to the north and west of the asteroid. Date Taken: March 7, 2019 Instrument Used: OCAMS (PolyCam) Credit: NASA/Goddard/University of Arizona https://www.asteroidmission.org/20190307-polycam-northern-boulder/
  9. More data, more stories: 11M of 1B shots. https://www.asteroidmission.org/bennu-visualized-by-ola-large/ and https://solarsystem.nasa.gov/news/892/10-ways-osiris-rex-is-advancing-the-asteroid-frontier/?fbclid=IwAR1hSTylr55wgNT4oBj28PXT06ucLIJ63lLKeIkQDvLS_baBgDKgHw1mLOY And don't forget to watch Hayabusa2 make a crater on Ryugu today http://www.hayabusa2.jaxa.jp/en/galleries/onc/nav20190404/
  10. This might be good enough for RSS. This is also the shape model we are superimposing image data on, so it is professional grade (until we get a lidar based one in the summer). https://www.asteroidmission.org/updated-bennu-shape-model-3d-files/v20_shapea_24fps_sm_1/ Also, if you want the latest science here are a series of manuscripts just published (many behind paywalls, but per NASA policy all will appear here after a proprietary period: https://www.ncbi.nlm.nih.gov/pmc/funder/nasa/) The unexpected surface of asteroid (101955) Bennu https://rdcu.be/btlxy Craters, boulders and regolith of (101955) Bennu indicative of an old and dynamic surface https://rdcu.be/btlx8 The dynamic geophysical environment of (101955) Bennu based on OSIRIS-REx measurements https://rdcu.be/btlxX The operational environment and rotational acceleration of asteroid (101955) Bennu from OSIRIS-REx observations https://rdcu.be/btlxS Evidence for widespread hydrated minerals on asteroid (101955) Bennu https://rdcu.be/btlxR Properties of rubble-pile asteroid (101955) Bennu from OSIRIS-REx imaging and thermal analysis https://rdcu.be/btlxL Shape of (101955) Bennu indicative of a rubble pile with internal stiffness https://rdcu.be/btlxI
  11. You can also put it on your phone and use a (cheap) VR headset to see it.
  12. Ryugu has not been observed to be active, though images at the specific camera angles that made them apparent for OSIRIS-REx (for improving navigation accuracy) have not (yet) been taken by Hayabus2. However, the hydration bands in the infrared are much weaker in Ryugu than Bennu and the magnetite features are absent in Ryugu. This points to a Bennu being wetter, which might be the mechanism for ejecting particles while at perihelion.
  13. Remember this is a composite. The particles are too dim to see without hugely overexposing Bennu.
  14. We don’t know yet, but we’re working on it.
  15. We have a campaign this summer, but the particles are small 1 to <30cm Our earlier plume campaign was negative, so the gas (if that’s the mechanism) isn’t abundant. But we’ll try. It is exciting for return