Originally posted by ProfEmeritus
The PEAK was on the 17th. Meteors can be seen for any of the annual meteor shower events anywhere from 1 to 5 days on either side of the peak time.
You are correct, but we can rule out the Leonids, as the Leonid radiant was well below the horizon at the time. 18 seconds is also a very long tome
for a Leonid.
However, The Taurid radiant (or radiants technically as there are two branches to the Taurid meteor stream) was just above the horizon at 17:30 PM
local time in Edmonton. This also tallies with the fireball being seen to "travel parallel to the horizon". Meteors belonging to a shower can only
appear to travel low and parallel to the horizon when the meteor shower's "radiant" (in Taurus since we are talking about Taurids) is not far above
the horizon.
Here's a snapshot of a small part of the horizon as an observer in Edmonton looking East would have seen it at 17:30 on the 20th:
I've marked roughly where the two Taurid radiants would be in red.
Originally posted by MoonMine
Originally posted by Ironclad
300mph?
Dude, if this were a chunk of space rock, it would be doing a damn sight more than 300mph.
Your looking as a couple of thousand mph.
No Sir.
Terminal velocity for a non streamlined object should not exceed around 320Mph. Unless it is a (very) streamlined rock, in which case it should still
be well below "thousand Mph".
Reference skydiver: Tv = aox. 200Mph
Air resistance / Friction / Brakes.
First of all, it depends at what stage of the flight of the meteoroid you are talking about...
This looks like a slow one, so it would have started out at around 15-25 km/s probably. If it survived long enough, it would have ceased to become
luminous when it lost most of it's cosmic velocity (at around 1km/s I believe). Soon after that it would have decelerated to free fall velocity as
Ironclad pointed out.
Originally posted by Nox Vulpes
I knew the C.H.U.D. would sort it out. Very good information again, thanks. We can still hope, right? Just for the night?
Always a pleasure Nox
There is nothing for any of us to worry about, the chances of more this size are low, and anything big enough to threaten us is even less likely. The
chances of being killed by a meteor are extremely remote
Having said that, there is always the potential for a real hit from a big enough rock to do damage. The chances are so low that it's better not to
worry about it and to go out and enjoy the show. Some more bright fireballs may well be seen at this time... so keep watching and you may get lucky
Originally posted by whoshotJR
From the video above it looks like it did actually hit the ground.
Shouldn't something the size of the meteor in the video make a damn big whole if it was even a medium density ?
ignore the post. Somebody posted an old video.
Not to worry, but this provides a good opportunity to demonstrate why meteorites, if they did survive to the ground, will be a long way away from
anywhere where the meteor appeared close to the horizon, ie. Alberta
It's only when you see a meteor extinguish close to overhead that you should consider running for cover, or if you saw a "point meteor" that
continues to increase in brightness rapidly and unabatedly, in which case you may as well enjoy the last few seconds of your life witnessing something
no one in living history has ever seen before
That this meteor was seen over a wide area is not that unusual, when you take into account the altitude meteors are visible at. They are basically
only visible in the upper atmosphere. Usually, on encountering the lower atmosphere where the air is more dense, if they have not already, they
self-destruct, which is what this one seems to have done, and I do believe that sonic booms were heard which points to something surviving and
possibly making it down to the ground or sea bed.