Asteroids

Discussion in 'Science, Tech, & Space Exploration' started by Toroid, Nov 25, 2018.

  1. Toroid

    Toroid Founding Member

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  2. nivek

    nivek As Above So Below

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    Giant pyramid-shaped asteroid to shoot past earth in hours

    A 427-foot pyramid-shaped asteroid is due to fly by Earth on Sunday, scientists say.

    According to the Centre for Near-Earth Object Studies at Nasa’s Jet Propulsion Laboratory, the object, called VH5 2019, will harmlessly fly past around 4.27 million miles from our planet at a speed of 6.1 miles per second.

    At 187ft by 426.5ft, the asteroid is “pyramid-shaped" and almost as large as the Great Pyramid of Giza.

    The asteroid is one of five due to fly past Earth over the weekend, all at safe distances.


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  3. Toroid

    Toroid Founding Member

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    It looks like we have another system lord on the loose. :eek:
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  4. Toroid

    Toroid Founding Member

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  5. Toroid

    Toroid Founding Member

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  6. Toroid

    Toroid Founding Member

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  7. Toroid

    Toroid Founding Member

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  8. Kchoo

    Kchoo At Peace.

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    2000 years between Football field sized asteroids and we are due for a hit... Could wipe out a whole city instantly... unless we can deflect it.


    What killed the dinosaurs wa a large asteroid or comet about 11 to 81 kilometers (6.8 to 50.3 miles) in diameter, the Chicxulub impactor, striking the Earth.

    The closest known approach of Apophis comes on April 13, 2029, when the asteroid comes to within a distance of around 31,000 kilometers from Earth's surface. As of 2014, the diameter of Apophis is estimated to be approximately 370 metres (1,210 ft).

    The largest known Potentially Hazardous Asteroid (PHA) is (53319) 1999 JM8 which is actually only 7 km in diameter. Its next closest approach in the 21st century will be in 2075 at 0.256 AU 0.256 au (38,300,000 km; 23,800,000 mi) and in August 2137 at 0.0764 au (11,430,000 km; 7,100,000 mi).[1] For comparison, the planet Venus is about 40 million km (25 million mi).
     
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  9. Toroid

    Toroid Founding Member

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  10. Toroid

    Toroid Founding Member

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  11. SOUL-DRIFTER

    SOUL-DRIFTER Life Long Researcher

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    Here is a site list some of the known NEO and estimated size and possible date of impact.

    Sentry: Earth Impact Monitoring

    All it would take is another asteroid to bump into another to change trajectory.

    My gut tells me we are in for a surprise showing of game changer. Close in size to the one that hit 65 million years ago.

    Somewhere I read we get hit by one of that size average every 50 million years.
    That means we are over due for a big one.
     
  12. nivek

    nivek As Above So Below

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    2 new comets and a rare trojan asteroid orbiting Earth discovered by astronomers within 3 weeks

    First it was C/2021 A1 (Leonard), then C/2021 B3 (NEOWISE) and finally asteroid 2020 XL5.

    C/2021 A1 (Leonard)

    MPEC 2021-A99 announced the discovery of a comet (magnitude ~19.5) by Gregory J. Leonard on CCD images taken on Jan. 3.54-3.56 UT with the Mount Lemmon Survey’s 1.5-m reflector. Follow-up measurements were performed by professional astronomers, who acknowledged the discovery.

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    New Comet C/2021 A1 (Leonard)

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    C/2021 A1 (Leonard) has a diffuse coma about 7″ in diameter. This comet has excellent brightness prospects for December 2021.

    In fact, before the perihelion on January 3, 2022, at a distance of 0.6 AU, comet C/2021 A1 (Leonard) will pass just 0.233 AU from Earth on December 12, 2021 and it will have an exceptionally close pass of Venus at 0.028 AU on December 18, 2021.

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    Orbit diagram of new comet C/2021 A1 (Leonard)

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    Comet C/2021 A1 (Leonard) could potentially become a naked-eye object.


    C/2021 B3 (NEOWISE)

    MPEC 2021-C16 announce the discovery of a new comet (magnitude ~19) in infrared images obtained during Jan. 22 UT with the Near-Earth Object Wide-field Infrared Survey Explorer (or NEOWISE). The new comet has been designated C/2021 B3 (NEOWISE).

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    New Comet C/2021 B3 (NEOWISE)

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    Follow-up measurements show that this object is a comet with a compact coma about 10″ arcsecond in diameter.

    Earth Trojan Asteroid 2020 XL5

    Earth has a second Trojan asteroid sharing its orbit, reports amateur Tony Dunn on the Minor Planet Mailing List.

    The asteroid, dubbed 2020 XL5, is a few hundred meters across and its orbit is tied to a gravitationally stable ahead of the Earth in its orbit.

    What are Trojan Asteroids?
    Trojans are asteroids gravitationally locked to stable Lagrange points either 60° ahead (L4) or behind (L5) the planets in their orbits around the Sun. 2020 XL5 was found around the L4 point. Massive Jupiter has more than 9,000 Trojans.

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    Earth-Sun Lagrange points (not to scale). Trojans orbit near the L4 and L5 regions, though their orbits may stray from those exact points.

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    So far, Trojans have been found sharing orbits — at least temporarily — with Neptune, Uranus, Mars, Venus, and Earth.

    Wha are Earth Trojan Asteroids so hard to find?

    Earth Trojans are hard to find because during most of their orbits, they appear close to the Sun in the sky. Not only that, but the gravitational resonance does not hold them in lockstep at 60° ahead and behind of the Earth, explains Dunn.


    Instead, the objects trace paths around the L4 and L5 points, which are themselves moving as Earth orbits the Sun.

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    An initial calculation of 2020 XL5’s trajectory (green), a new Earth Trojan Asteroid

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    The first Earth trojan, 2010 TK7, comes within 20 million kilometers (12 million miles) to Earth every few hundred years; it is currently drifting away. Models show its orbit is stable enough to stay in a one-to-one resonance with Earth for about a quarter million years. While there are Earth Trojan orbits that are stable for the life of the solar system, no objects have been found occupying them.

    Two spacecraft on their way to visit near-Earth objects searched Trojan regions in 2017, but NASA’s Osiris-Rex found nothing at L4 and the Japanese Hayabusa 2 found nothing at L5.

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    orbit of 2020 XL5

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    However, the observations were not definitive, and in 2019 Renu Malhotra (University of Arizona) wrote that the Earth could still have up to several hundred Trojans at least a few hundred meters in diameter, amounting to several percent of the some 10,000 near-Earth objects of that size.


    So are we going to find some more of these celestial troyan horses? Are they inhabited by deadly viruses? Next generations will know!

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  13. SOUL-DRIFTER

    SOUL-DRIFTER Life Long Researcher

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    I will worry when the large cube one arrives.
    The Borg!!!:laugh8:
     
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  14. Sheltie

    Sheltie good to the last drop

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    I am convinced, no matter how hard we search, it will be the one we don't see that hits us.
     
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  15. Toroid

    Toroid Founding Member

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    I suspect a collision will be by design like following a script.
     
  16. SOUL-DRIFTER

    SOUL-DRIFTER Life Long Researcher

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  17. Toroid

    Toroid Founding Member

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  18. August

    August Metanoia

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    Yes Apophis . April 13th 2029 super close fly by will be one to watch for.
     
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