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posted by Fnord666 on Saturday August 12, @05:46PM   Printer-friendly
from the duck-just-in-case dept.

2012 TC4 will pass Earth well within the Moon's orbit a month from now, but not nearly as close as previously estimated:

Mark your calendar for Oct. 12. That's when asteroid 2012 TC4 will slip past Earth at an expected distance of around 27,300 miles (44,000 kilometers). The European Southern Observatory's Very Large Telescope in Chile recently caught sight of the asteroid, which could be up to 100 feet (30 meters) in size.

NASA is leading a coordinated international campaign to observe TC4. In July, NASA suggested the asteroid could squeeze in as close as 4,200 miles (6,800 kilometers), but the European Space Agency's latest estimates give us more breathing room.

Geostationary equatorial orbit (GEO) is at about 35,786 km above mean sea level.

Also at Phys.org (AFP).


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  • (Score: 0) by Anonymous Coward on Saturday August 12, @05:48PM (5 children)

    by Anonymous Coward on Saturday August 12, @05:48PM (#552909)

    What are the risks to Earth? Should we expect a Tunguska type of event?

    • (Score: 2) by takyon on Saturday August 12, @05:52PM

      by takyon (881) <{takyon} {at} {soylentnews.org}> on Saturday August 12, @05:52PM (#552910) Journal

      It is about 15-30 metres (49-98 feet) long, and was travelling at a speed of some 14 kilometres (nine miles) per second when spotted.

      [...] A space rock slightly bigger than TC4, at 40 metres, caused the largest Earth impact in recent history when it exploded over Tunguska, Siberia, in 1908.

      In 2013, a meteoroid of about 20 metres exploded in the atmosphere over the city of Chelyabinsk in central Russia with the kinetic energy of about 30 Hiroshima atom bombs.

      If their calculations are correct, there is no risk to Earth because it won't pass through the atmosphere or impact the surface.

      --
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    • (Score: 0) by Anonymous Coward on Saturday August 12, @06:09PM

      by Anonymous Coward on Saturday August 12, @06:09PM (#552915)

      The main risk is that you will continue to be nickle and timed by nasa for these pr releases.

    • (Score: 2) by kaszz on Saturday August 12, @07:03PM (2 children)

      by kaszz (4211) on Saturday August 12, @07:03PM (#552929) Journal

      City killer size, though the speed at 14 000 m/s is high to the usual 4000 m/s. So if it hits it would wipe out a megacity. And at the distance of 44 000 km. I'll guess it won't get caught in the gravity field.

      It is however a good reminder that our luck may run out.

  • (Score: 2) by HiThere on Saturday August 12, @11:25PM (7 children)

    by HiThere (866) on Saturday August 12, @11:25PM (#553025)

    I find it concerning that the prior orbit calculated was so wrong. This seems to imply that the other orbits they calculate might be equally wrong, and not necessarily in the same direction.

    --
    Put not your faith in princes.
    • (Score: 2) by kaszz on Sunday August 13, @04:07AM (4 children)

      by kaszz (4211) on Sunday August 13, @04:07AM (#553103) Journal

      Did you account for the distance to Earth? the closer a object gets. The more data for an accurate trajectory and less chance of disruptions.

      • (Score: 2) by HiThere on Sunday August 13, @06:49PM (3 children)

        by HiThere (866) on Sunday August 13, @06:49PM (#553324)

        No. Those making the projections are supposed to account for that. And the stories never give error bars, so I can't even say for certain if their earlier projection was wrong. Still, it sure *looks* as if it was wrong. They were off by over 20,000 miles, which would mean that if that was within their error bars, so was a direct central impact.

        That said, yes, this kind of prediction is difficult and uncertain. But the prediction (as reported) wasn't "better keep an eye on this one", but rather "this one is going to miss us safely by this much". Which leads to a lack of trust in all the other predictions (as reported).

        --
        Put not your faith in princes.
        • (Score: 2) by kaszz on Monday August 14, @03:48AM (2 children)

          by kaszz (4211) on Monday August 14, @03:48AM (#553466) Journal

          Actual policy if there IS an impact is to not tell the public to avoid public riots. Figure that.

          I'll keep your point in mind though. There obviously seems to be a loophole.

          • (Score: 0) by Anonymous Coward on Monday August 14, @06:47AM

            by Anonymous Coward on Monday August 14, @06:47AM (#553531)

            [citation needed]

            Like the leaky White House can keep it a secret anyway.

          • (Score: 2) by Justin Case on Monday August 14, @04:51PM

            by Justin Case (4239) Subscriber Badge on Monday August 14, @04:51PM (#553750)

            Agree with AC. Citation?

            --
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    • (Score: 3, Interesting) by JoeMerchant on Sunday August 13, @08:35PM (1 child)

      by JoeMerchant (3937) on Sunday August 13, @08:35PM (#553354)

      I think they calculate cones, then quote the close side of the cone within some confidence interval... thus the news tends to get better most of the time.

      • (Score: 3, Interesting) by Sulla on Monday August 14, @09:54PM

        by Sulla (5173) Subscriber Badge on Monday August 14, @09:54PM (#553853)

        When I was in college I had a lab class that took snapshots of rock locations and used a program to track the possible future locations. It did end up looking like an arcing cone. It was a pretty cool class and some of my classmates got their report published and got some sort of cool NASA acknowledgement for correctly predicting their rock hitting Mars. Mine did piss all forever hanging out in the belt.

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