Author Topic: Meteor Strikes Chelyabinsk, Russia  (Read 136764 times)

Offline Rocket Science

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #540 on: 11/07/2013 03:06 PM »
A little off topic, but a bright fireball lit up Southern California last night:

(Discovery channel has a video)

http://news.discovery.com/space/asteroids-meteors-meteorites/possible-taurid-fireball-dazzles-southern-california-131107.htm
Neil deGrasse Tyson was talking about both events on CNN this morning and about deflecting objects for Earth defense...
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Offline PahTo

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #541 on: 11/07/2013 03:10 PM »

Article in this morning's SeattleTimes about planetary defense as well...

http://seattletimes.com/html/nationworld/2022206844_asteroidrisksxml.html

Offline kevin-rf

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #542 on: 11/07/2013 06:00 PM »
At least we have some good news today:

http://www.slate.com/blogs/bad_astronomy/2013/11/07/good_asteroid_news_tv135_no_longer_a_threat.html

Quote
After writing about small impacts being more common than we previously thought, I have some good news: The chance of an impact from the newly-discovered asteroid 2013 TV135 have dropped to essentially zero.
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Offline MP99

Re: Meteor Strikes Chelyabinsk, Russia
« Reply #543 on: 11/07/2013 09:09 PM »
A little off topic

Nope. Mods have merged BBC article into this thread (#541), so bang-on-topic.



but a bright fireball lit up Southern California last night...

Cheers, Martin

Offline Melt Run

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #544 on: 11/07/2013 09:35 PM »
At least we have some good news today:

http://www.slate.com/blogs/bad_astronomy/2013/11/07/good_asteroid_news_tv135_no_longer_a_threat.html

Quote
After writing about small impacts being more common than we previously thought, I have some good news: The chance of an impact from the newly-discovered asteroid 2013 TV135 have dropped to essentially zero.
And the bad news is:
http://www.theregister.co.uk/2013/11/06/chelyabinsksized_meteors_impacts_seven_times_more_common_than_first_thought/
Well you can't win all of them. I may get up in the middle of the night tonight but it won't be because I'm worrying about this!
« Last Edit: 11/07/2013 09:57 PM by Melt Run »

Offline kevin-rf

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #545 on: 11/07/2013 09:54 PM »
I miss the hot tub... nothing like sitting out in the middle of the night watching them zip by... Oh well, just waiting for a delivery date on the replacement.

A really bright light in the world of instant information, instant analysis, instant gratification is NASA's All Sky Fireball Network (bottom of the http://spaceweather.com page) that strives to model the orbits of fireballs it see's each night.

http://fireballs.ndc.nasa.gov/

Always want'd a dome camera like that. It would be great for tracking meteor's and bright satellite.
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Offline Danderman

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #546 on: 04/19/2014 04:21 PM »


A near miss last night over Murmansk.

Online ugordan

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #547 on: 04/19/2014 04:29 PM »
A near miss last night over Murmansk.

Nice find, but "a near miss"? That looked like your typical bolide, far from a Chelybinsk scale event.
« Last Edit: 04/19/2014 04:30 PM by ugordan »

Offline Prober

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #548 on: 04/19/2014 04:53 PM »
A near miss last night over Murmansk.

Nice find, but "a near miss"? That looked like your typical bolide, far from a Chelybinsk scale event.

I hope we can get more videos out to see.
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Offline Danderman

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #549 on: 04/19/2014 07:46 PM »
A near miss last night over Murmansk.

Nice find, but "a near miss"? That looked like your typical bolide, far from a Chelybinsk scale event.

Impossible to tell from one point of view. If there were multiple videos, someone could calculate the trajectory.

This could be a low flying speck of dust, or a high flying asteroid.

Offline kevin-rf

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #550 on: 04/19/2014 07:50 PM »
The linked video had the view from two different dash cams. They now just need to locate where the dash cams when when they recorded the event. Considering the date code on the first is 4/19/2014 I am sure more will turn up.
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Online ugordan

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #551 on: 04/19/2014 07:57 PM »
Impossible to tell from one point of view.

Well, not really. Good educated guesses can still be made. From the brightness and duration profile we can be pretty sure that it was a fairly small object that got disintegrated fast, although possibly with recoverable fragments on the ground. This is night footage where camera exposure is longer making objects appear brighter and yet the bolide didn't really turn "night into day". This suggests this object is many times smaller than Chelyabinsk. No sonic booms heard is another good clue about the magnitude of the event.

Offline go4mars

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #552 on: 04/20/2014 12:54 AM »
Impossible to tell from one point of view.

Well, not really. Good educated guesses can still be made. From the brightness and duration profile we can be pretty sure that it was a fairly small object that got disintegrated fast, although possibly with recoverable fragments on the ground. This is night footage where camera exposure is longer making objects appear brighter and yet the bolide didn't really turn "night into day". This suggests this object is many times smaller than Chelyabinsk. No sonic booms heard is another good clue about the magnitude of the event.
I'm sure the infrasound folks have a very clear idea of magnitude (energy/duration), but I'm pretty sure that dataset remains classified.  But yeah, I'm sure guys like Alan Hildebrand are already refining P10 P50 P90 with every new dashcam view.  Frame by frame. 
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Offline Ben the Space Brit

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #554 on: 05/28/2014 06:04 PM »
I think this theory is supported by the fact that the meteor's predicted orbit started in the Main Belt. It was probably knocked off of a parent body there by a collision, probably with a long-period comet.

I wonder if there are any other significant bodies on the same orbital track, waiting for their moment?
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Offline Stellar_Speedster

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #555 on: 11/11/2014 05:46 AM »
I think this theory is supported by the fact that the meteor's predicted orbit started in the Main Belt. It was probably knocked off of a parent body there by a collision, probably with a long-period comet.

I wonder if there are any other significant bodies on the same orbital track, waiting for their moment?

Exactly what I tought about it. Did this come in unnotissed ?
« Last Edit: 11/11/2014 05:46 AM by Stellar_Speedster »

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #556 on: 11/11/2014 03:17 PM »
I think this theory is supported by the fact that the meteor's predicted orbit started in the Main Belt. It was probably knocked off of a parent body there by a collision, probably with a long-period comet.

I wonder if there are any other significant bodies on the same orbital track, waiting for their moment?

Exactly what I tought about it. Did this come in unnotissed ?
Only two bodies have ever been noticed before impacting earth; one that hit an uninhabited bit of Sudan in 2008 (2008 TC3), and another that impacted somewhere in the atlantic earlier this year (2014 AA).

Offline kevin-rf

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #557 on: 11/14/2014 11:46 PM »
JPL just released the data set on all the large impacts detected during the last 20 years. 556 in all. One can assume this is the declassified IR early warning satellite (DSP, SBIRS) data set.

http://www.jpl.nasa.gov/news/news.php?feature=4380

« Last Edit: 11/14/2014 11:51 PM by kevin-rf »
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Offline kevin-rf

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #558 on: 11/15/2014 12:02 AM »
Better press release: http://neo.jpl.nasa.gov/news/news186.html

Interesting that there is a slight gap above the Amazon, while slightly larger numbers where detected over Siberia and China. Anyone want to go all tinfoil and argue it is because there are no ICBM's in South America and it is not as well covered?
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Offline aceshigh

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Re: Meteor Strikes Chelyabinsk, Russia
« Reply #559 on: 11/15/2014 10:19 AM »
Better press release: http://neo.jpl.nasa.gov/news/news186.html

Interesting that there is a slight gap above the Amazon, while slightly larger numbers where detected over Siberia and China. Anyone want to go all tinfoil and argue it is because there are no ICBM's in South America and it is not as well covered?

actually, the whole brazilian territory is free of impacts on this map, not only the amazon.

Edit: actually, there is one on Amapá state, then on the coasts of Pernambuco and Rio Grande do Norte, and also off the coast of Santa Catarina in the south. But apparently in LAND, only at Amapá state.
« Last Edit: 11/15/2014 11:02 AM by aceshigh »

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