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News GEMINID METEOR SHOWER

Discussion in 'General Discussion' started by Ram, Dec 10, 2016.

  1. Ram

    Ram

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    GEMINID METEOR SHOWER: Earth is entering a stream of gravelly debris from "rock comet" 3200 Phaethon, source of the annual Geminid meteor shower. This is causing a drizzle of meteors ahead of the shower's peak on Dec. 13-14. Just last night, Brian Emfinger watched a Geminid fireball burn up above Pinnacle Mountain near Little Rock, Arkansas:

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    "Despite bright moonlight and the city lights of nearby Little Rock, this fireball was easy to see," says Emfinger.

    At the moment, Geminid rates are scarcely more than a few per hour. Sightings will increase in the nights ahead as Earth plunges deeper into the rock comet's debris zone. By the time peak night arrives, rates could be as high as 20 or 30 per hour--less than usual because of glare from the full Moon, but still a nice display. For observers in both hemispheres, the best time to look is during the hours between local midnight and sunrise on Wednesday, Dec. 14th. [sky map]

    Realtime Meteor Photo Galler
  2. Ram

    Ram

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    That time again...Enjoy

    A ROCK COMET APPROACHES EARTH: You've heard of comets. But have you ever heard of a rock comet? They exist, and a big one is approaching Earth this week. 3200 Phaethon will fly past our planet on Dec. 16th only 10 million km away. Measuring 5 km in diameter, this strange object is large enough for amateur astronomers to photograph through backyard telescopes. A few nights ago, the Astronomy Club of the Sing Yin Secondary School in Hong Kong video-recorded 3200 Phaethon's approach using a 4-inch refractor:



    "We observed 3200 Phaethon from the basketball court of our school campus," the club reports. "Our school is located close to the city center where the visual limiting magnitude is about 2 to 3. Despite the glare, we were able to record the motion of this object." (For others who wish to do this, Bob King of Sky & Telescope has written an excellent set of observing tips.)

    3200 Phaethon is the source of the annual Gemini meteor shower, which is also coming this week. Sky watchers can see dozens of Geminids per hour on Dec. 13th and 14th as gravelly bits of the rock comet disintegrate in Earth's upper atmosphere. The best time to look is during the dark hours before sunrise when Gemini is high in the sky.

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    "This is 3200 Phaethon's closest encounter with Earth until December of 2093, when it will come to within 1.8 million miles," notes Bill Cooke of NASA's Meteoroid Environment Office. Despite the proximity of the rock comet, he doesn't expect to see any extra Geminids this year. "It would take at least another revolution around the sun before new material from this flyby could encounter Earth - probably longer."

    A "rock comet" is an asteroid that comes very close to the sun--so close that solar heating scorches plumes of dust right off its stony surface. 3200 Phaethon comes extremely close to the sun, only 0.14 AU away, less than half the distance of Mercury, making it so hot that lead could flow like water across its sun-blasted surface. Astronomers believe that 3200 Phaethon might occasionally grow a comet-like tail of gravelly debris--raw material for the Geminid meteor shower. Indeed, NASA STEREO-A spacecraft may have seen this happening in 2010. There is much to learn about 32900 Phaethon, which is why NASA radars will be pinging it as it passes by. Stay tuned for updates.
    Rapterman likes this.
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