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Originally posted by intrptr
Hey FireballStorm. Glad I caught your entries. Have you recorded any Orionids? Let us know.
Originally posted by intrptr
And have you had a chance to analyze any of this?
Meteor over SF Bay Area
METEOR MAKES LANDFALL: A small asteroid that exploded over the San Francisco Bay Area on Oct. 17th, shaking houses with its sonic boom, might have scattered pieces of itself on the ground. That's the conclusion of Peter Jenniskens of the NASA Ames Research Center. He triangulated data from a pair of meteor surveillance cameras to determine the fireball's trajectory, denoted by the black arrow in the map below:
"The asteroid entered at a [relatively slow] speed of 14 km/s. There's a good chance that a fairly large fraction of this rock survived and fell somewhere around the North Bay," says Jenniskens. "Much more accurate results will follow from a comprehensive study of the video records. Now, we hope that someone recovers a meteorite on the ground."
In the map, red dots represent the surveillance cameras Jenniskens used to calculate the trajectory. The black arrow traces the asteroid's path; 85 km and 39 km are the altitudes of the asteroid at the two ends of the arrow. Jenniskens adds that "39 km is not the end point, but the final bit captured by the San Mateo video camera." The disintegrating asteroid continued beyond the tip of the arrow for a possible landfall somewhere north of San Francisco. Stay tuned for updates on the meteorite hunt.
Note: This was not an Orionid.
Originally posted by fiftyfifty
I wondered earlier if these sonic booms could all be related to a single asteroid which has broken up and is in orbit around the Earth with fragments re-entering seperately? Is this a possibility or would these fragments have been detected?
It has been estimated that 100,000 tonnes of extraterrestrial material reach the Earth's surface every year. It can be anything from fine dust to metallic masses weighing many tonnes.
Extraterrestrial material that falls towards the Earth is classified by size. The majority of this material is in the form of tiny particles called micrometeorites. They fall continuously, and arrive unnoticed.
Meteors or 'shooting stars' are often seen in a clear night sky. They are larger dust particles and small rocky fragments, many no more than a gram in weight, which are burnt up by friction as they fall through the Earth's atmosphere.
Originally posted by intrptr
My dream of hunting meteoric treasure is to 4 wheel it around on dry lake beds in the desert. Less competition. Been to the arctic lately? They silhouette black against ice fields and are visible for miles with binocs. I learned that from the meteor man.
Originally posted by MDDoxs
Interesting development.
All this brings up a troubling thought; Why are there no warnings?
I realize tracking these objects is difficult, but if we can not efficiently track these types of things, it does not take a very large chunk of space rock to do significant! damage.edit on 19-10-2012 by MDDoxs because: (no reason given)
Originally posted by Flavian
Originally posted by MDDoxs
Interesting development.
All this brings up a troubling thought; Why are there no warnings?
I realize tracking these objects is difficult, but if we can not efficiently track these types of things, it does not take a very large chunk of space rock to do significant! damage.edit on 19-10-2012 by MDDoxs because: (no reason given)
I sometimes think the same but at others i honestly think "what would be the point of warning us?". I mean, really? If something massive was going to smash into us, what good would knowing it was coming do? Not like you could effectively prepare for it and the hours leading up to it would be truly horrific.
Originally posted by fiftyfifty
reply to post by Trillium
It will be interesting to see if you catch anything! Are you in the UK?