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Thread: Asteroid Ryugu looks like an Octahedron

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    Avalon Member uzn's Avatar
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    Default Asteroid Ryugu looks like an Octahedron

    The Jaxa´s Spaceprobe Hayabusa 2 closed in on Ryugu up to 100 km and shot some amazing Pictures.




    The shape seems to be roughly an octaeder. The Asteroid is about 100 km wide. And on top at the pole there seems to be an highly reflective area or a light.







    rotating Ryugu :
    Last edited by uzn; 23rd June 2018 at 14:44.

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    Default Re: Asteroid Ryugu looks like an Octahedron

    Thanks for this! I had no idea what an octaeder was, so I looked it up: it appears to be Dutch for octahedron, but is very occasionally used in English. So I took the liberty of changing the thread title, which I trust is okay.


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    Default Re: Asteroid Ryugu looks like an Octahedron

    Speaking of Asteroids:
    Here are all images done by the Rosetta Spaceprobe. Published by the Max-Plank-Institute.
    (over 100.000 Images)

    https://imagearchives.esac.esa.int/








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    Default Re: Asteroid Ryugu looks like an Octahedron

    Some of those high-res images ^^ are very interesting... there are apparently a bunch of quite large, loose rocks sitting there on what's quite a small object, presumably simply held by the asteroid's gravity. I'd not have thought that its gravity was enough to do that.

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    Default Re: Asteroid Ryugu looks like an Octahedron

    On the other hand, gravity is not enough on Vesta to collapse a 13 miles high mountain unlike on Earth where, unless continuously and actively propped up, mountain ranges have a tendency to sink to buoyancy equilibrium:


    Asteroid Vesta, with a 13-mile-high mountain now visible to the naked eye

    Michael D'Estries Mother Nature Network
    Wed, 20 Jun 2018 12:01 UTC


    Vesta, as captured by NASA's Dawn spacecraft in 2011, features a mountain that rises more than 65,000 feet above the asteroid's south pole. © NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

    Look up in nighttime sky anytime between now and July 16, and you just might spy our solar system's brightest asteroid.

    Vesta, a 326-mile-wide object residing in the asteroid belt between Jupiter and Mars, is about to make its closest approach to Earth in nearly two decades. But don't worry, unlike other close calls with asteroids in recent history, Vesta is in a stable orbit around the sun that will only bring it within 106 million miles of Earth. Nonetheless, this convergence will make it visible to the naked eye, with a magnitude brightness approaching a maximum of 5.3 this week.

    Unlike other asteroids, Vesta's internal geology mimics those of terrestrial planets, with a metallic iron-nickel core covered by a surface crust of basaltic rock. In fact, it's this "frozen lava" that gives Vesta its beautiful reflectivity, casting back 43 percent of all light that hits it. (For comparison, our moon only reflects about 12 percent of all light.)

    A 2011 visit by the NASA space probe Dawn confirmed Vesta as our solar system's lone remaining protoplanet, an embryonic remnant of the material that created future worlds like Earth.
    "We now know that Vesta is the only intact, layered planetary building block surviving from the very earliest days of the solar system," Carol Raymond, deputy principal investigator for the Dawn spacecraft, said during a 2012 press conference.
    An imposing mountain borne from a violent past


    Vesta's 65,000-foot high peak rises from the center of the Rheasilvia impact crater. A much older crater, named Veneneia, was discovered underlying it. © NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

    Ancient pedigree isn't the only feature of Vesta that makes it a geologic celestial wonder. Its south pole is also home to one of the tallest known mountains in the solar system.
    "The south polar mountain is larger than the big island of Hawaii, the largest mountain on Earth, as measured from the ocean floor," Dawn mission investigator Chris Russell told reporters.

    "It is almost as high as the highest mountain in the solar system, the shield volcano Olympus Mons on Mars."
    Whereas Olympus Mons rises nearly 14 miles (72,000 feet) above the surface of Mars, the unnamed peak on Vesta is just under 13 miles (65,000 feet) tall. It's located in a 314-mile-wide crater, also one of the largest in the solar system, named Rheasilvia, after the mythological vestal virgins of Rome. It's theorized that Rheasilvia and its central peak were formed roughly 1 billion years ago from a massive planetary scale impact that delivered a glancing blow at an estimated 11,000 miles per hour.
    "Vesta was lucky," Peter Schultz, professor of earth, environmental, and planetary sciences at Brown University, said in a statement.

    "If this collision had been straight on, there would have been one less large asteroid and only a family of fragments left behind." Schultz published a study on the asteroid's violent past in 2014.
    Vesta's scrape with disaster would turn into a rare opportunity for scientists on Earth an eon later. The collision that rocked its south pole is estimated to have ejected at least 1 percent of the asteroid's mass into space, scattering a vast swath of debris throughout the solar system. Some of those rocks later made their way to Earth. In fact, it's estimated that some 5 percent of all space rocks found on Earth originated from Vesta, making it only a handful of solar system objects beyond Earth (including Mars and the moon) where scientists have a laboratory sample.

    Look for Saturn to point the way



    Vesta as it will appear in the night sky over the next several months. The asteroid will be visible to the naked eye until the middle of July. © In-The-Sky.org

    While Vesta is our brightest asteroid, its distance and small size still make it a sporting challenge to pick out with the naked eye. Your best bet is to use some high-powered binoculars or a telescope. Either way, follow these instructions from Bob King at Sky and Telescope to locate the correct patch of sky.
    "To find it, begin at Saturn then star-hop with the naked eye or binoculars to 3.8-magnitude Mu (μ) Sagittarii. The asteroid is located 2.5°-4° northwest of that star through mid-June. Despite its location in star-rich Sagittarius, Vesta has little competition from similarly bright stars, making it easy to spot."
    According to those who have previously spotted Vesta, the asteroid exhibits a yellowish hue and looks very much like a star. Grab a lawn chair, ditch the light pollution and look up! Vesta won't be this close to Earth again until 2040.
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    Default Re: Asteroid Ryugu looks like an Octahedron

    I wonder how the Electric Universe theory would explain Vesta?

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    Default Re: Asteroid Ryugu looks like an Octahedron

    Ryugu looks like a rough diamond crystal.

    Last edited by Hervé; 24th June 2018 at 22:52.


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    Default Re: Asteroid Ryugu looks like an Octahedron

    Bill, when you climb Vesta, be sure to take extra water for Mara.


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    Default Re: Asteroid Ryugu looks like an Octahedron

    Dennis..the attachment didn't work for me?

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    Default Re: Asteroid Ryugu looks like an Octahedron

    Octahedron or german Oktaeder

    Brilliant (Diamond)

    From an Octahedron Diamond you get a Brilliant if cut perfectly.


    Pyrit


    Zircon

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    Default Re: Asteroid Ryugu looks like an Octahedron

    Foxie, I don't know why the attachment doesn't work for you. Maybe Paul or Ilie knows why some attachments don't work. I added the attachment as an image, but instead got a link to the image at Avalon's server. In a search just now, I cannot find that same image to try a different way.

    {edit: Looks like Hervé was the wizard on this fix. Thanks, Hervé!}
    Last edited by Dennis Leahy; 26th June 2018 at 19:03.


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    Default Re: Asteroid Ryugu looks like an Octahedron

    The mythology behind this asteroid interests me, Ryugu-Jo the undersea place of the dragon sea king Ryugin.

    Last edited by Star Tsar; 25th June 2018 at 17:09.
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    Default Re: Asteroid Ryugu looks like an Octahedron

    Hayabusa 2 is closing in on Ryugu, now seen fom 40 km away.


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    Default Re: Asteroid Ryugu looks like an Octahedron

    Now Hayabusa 2 is 22 km away.

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    Default Re: Asteroid Ryugu looks like an Octahedron

    Orbits of Ryugu and Hayabusa 2


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    Default Re: Asteroid Ryugu looks like an Octahedron

    Close inspection of one of the pictures shows clearly RIGHT ANGLES. I would venture to say the Space Fleet has colonized this asteroid and is possibly mining it.

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    Default Re: Asteroid Ryugu looks like an Octahedron

    Quote Posted by Bill Ryan (here)
    Some of those high-res images ^^ are very interesting... there are apparently a bunch of quite large, loose rocks sitting there on what's quite a small object, presumably simply held by the asteroid's gravity. I'd not have thought that its gravity was enough to do that.
    Looks like a gravel pit.......no idea how anything stays attached to something hurtling through space. Must be a bit more than just "gravity"

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    Default Re: Asteroid Ryugu looks like an Octahedron

    Quote Posted by Foxie Loxie (here)
    I wonder how the Electric Universe theory would explain Vesta?
    Only to start off with, Foxie Loxie, the Electric Universe model would explain the most obvious aspects of what can be seen on the surface of Vesta ... its craters, riles, and mountainous features; all of this being due to EDM (Electrical Discharge Machining - it's a commonly used practice in manufacturing so, you can look it up). Thanks for expressing an interest in the EU model ... more and more people are starting to wake up to it.
    "We should not surrender our judgement to others, we must reclaim our ability to doubt and think for ourselves."

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    Default Re: Asteroid Ryugu looks like an Octahedron

    The german MASCOT Probe that is carried by the japanese Hayabusa 2 will land on Ryugu in Oktober 2018.


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    Default Re: Asteroid Ryugu looks like an Octahedron

    NASA compares Hayabusa 2 and their OSIRIS-REx mission.




    Bennu and Ryugu comparrison:


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