INCOMING!, Detection and observation of Earth-approaching asteroids. |
INCOMING!, Detection and observation of Earth-approaching asteroids. |
Mar 12 2010, 04:11 PM
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#226
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Senior Member Group: Members Posts: 1578 Joined: 14-October 05 From: Vermont Member No.: 530 |
http://www.technologyreview.com/blog/arxiv/24917/
QUOTE In 2007, however, the Hipparcos data was revised and other measurements of star velocities have since become available. How do these numbers change the figures? ... What the new data has allowed Bobylev to do is calculate the probability of Gliese 710 smashing into the Solar System. What he's found is a shock. He says there is 86 percent chance that GL 710 will plough through the Oort Cloud of frozen stuff that extends some 0.5 parsecs into space. [In 1.5 million years] Incoming Orange Dwarf! |
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Apr 15 2010, 12:47 PM
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#227
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Member Group: Members Posts: 115 Joined: 8-January 05 From: Austin | Texas Member No.: 138 |
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Apr 15 2010, 01:25 PM
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#228
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Newbie Group: Members Posts: 11 Joined: 31-May 09 From: Iowa Member No.: 4806 |
Long time reader, first post. This was a bright meteor or fireball caught on dash cam of patrol car in Eastern Iowa.
Link below: http://www.kcci.com/video/23158154/ |
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Apr 16 2010, 05:45 PM
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#229
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Senior Member Group: Members Posts: 2073 Joined: 13-February 10 From: Ontario Member No.: 5221 |
They found a piece:
http://www.duluthnewstribune.com/event/art...group/homepage/ |
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Oct 10 2010, 09:30 AM
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#230
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
There is some buzz on the internet today about object RT9B991, not yet issued a preliminary asteroid designation, that may come very close to Earth in the next days. It appears to have some significant parallax (i.e. to be close to us) but slow motion, as if it was seen "head on".
More observations will be needed to know when and how close it will get. |
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Oct 10 2010, 05:49 PM
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#231
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Thanks Paolo for highlight!
Based on Harvard ephemeris, minimum distance will be reached on Oct,12 around 11:14 UT, when proper motion will reach maximum value of 3900 arcsec/min (see plot below, with days on abscissa) Assuming a tipical speed of 15 Km/s, this means a geocentric distance slightly below 48000Km! -------------------- I always think before posting! - Marco -
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Oct 10 2010, 06:48 PM
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#232
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Senior Member Group: Members Posts: 1621 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
-------------------- Steve [ my home page and planetary maps page ]
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Oct 10 2010, 09:20 PM
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#233
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
meanwhile, our small rocky friend has got a preliminary designation: 2010 TD54 http://www.minorplanetcenter.org/mpec/K10/K10T65.html
according to the same circular, closest approach will be 0.00043 AU around noon UTC tuesday. That's about 64,000 km |
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Oct 10 2010, 09:54 PM
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#234
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
Anybody know how big it is?
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Oct 10 2010, 10:52 PM
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#235
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Not very, it seems; I'd bet that it's a lot less than 50m across, and probably less than 10. Peak visual magnitude is around 14 real near perapsis, otherwise hovers around 20. Phase angle changes dramatically as well; looks like it's coming straight out of the solar glare.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Oct 10 2010, 11:49 PM
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#236
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Founder Group: Chairman Posts: 14431 Joined: 8-February 04 Member No.: 1 |
2008 TC3 was about 4m across iirc - that might be a point of reference.
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Oct 11 2010, 12:07 AM
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#237
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Yeah, it's just a pebble in the sky. Should be some pretty cool flyby movies from the amateur astronomy community, though.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Oct 11 2010, 12:14 AM
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#238
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Senior Member Group: Moderator Posts: 3226 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
So that's a stand down on the bull's eye sign for my roof?
2008 TC3 has spoiled me. Am I the only one who WANTS another to hit? (though obviously below a size limit where damage might occur) -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Oct 11 2010, 12:48 AM
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#239
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Not at all! I'd love to see a nice, bright bolide & grab a hot chunk of virgin meteorite for my very own!
2008TC3 was basically a free sample-return mission; it'd be great to have these happen more often, and it looks like the whole NEO search/observation program is going to make major fall prediction much, much easier. -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Oct 11 2010, 05:16 AM
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#240
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
according to the same circular, closest approach will be 0.00043 AU around noon UTC tuesday. That's about 64,000 km Data interpolation suggest a minimum distance slightly above 0.00040 AU (exactly 60000 km) on Oct 12.483 (slighty later than previously stated): Based on magnitude in the approach phase (with phase angle close to 0 and assuming a standard albedo), diameter should be only 5m! -------------------- I always think before posting! - Marco -
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