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INCOMING!, Detection and observation of Earth-approaching asteroids.
stevesliva
post Mar 12 2010, 04:11 PM
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http://www.technologyreview.com/blog/arxiv/24917/

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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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ups
post Apr 15 2010, 12:47 PM
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http://www.youtube.com/watch?v=TR2uNajroOM

Big fireball over the US last night.
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galileo
post Apr 15 2010, 01:25 PM
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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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Explorer1
post Apr 16 2010, 05:45 PM
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They found a piece:
http://www.duluthnewstribune.com/event/art...group/homepage/
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Paolo
post Oct 10 2010, 09:30 AM
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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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dilo
post Oct 10 2010, 05:49 PM
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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) blink.gif Assuming a tipical speed of 15 Km/s, this means a geocentric distance slightly below 48000Km!
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Attached Image
 


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scalbers
post Oct 10 2010, 06:48 PM
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Good call, this discussion has it at 52000km.

http://tech.groups.yahoo.com/group/mpml/message/24302


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Paolo
post Oct 10 2010, 09:20 PM
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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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ngunn
post Oct 10 2010, 09:54 PM
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Anybody know how big it is?
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nprev
post Oct 10 2010, 10:52 PM
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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.


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djellison
post Oct 10 2010, 11:49 PM
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2008 TC3 was about 4m across iirc - that might be a point of reference.
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post Oct 11 2010, 12:07 AM
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Yeah, it's just a pebble in the sky. Should be some pretty cool flyby movies from the amateur astronomy community, though.


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volcanopele
post Oct 11 2010, 12:14 AM
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sad.gif So that's a stand down on the bull's eye sign for my roof? laugh.gif

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)


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post Oct 11 2010, 12:48 AM
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Not at all! smile.gif 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.


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dilo
post Oct 11 2010, 05:16 AM
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QUOTE (Paolo @ Oct 10 2010, 09:20 PM) *
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):
Attached Image

Based on magnitude in the approach phase (with phase angle close to 0 and assuming a standard albedo), diameter should be only 5m!


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