Originally posted by mrsdudara
Im am trying to figure out which direction this meteor came in from. Can any of you help please? After reading the news pieces and figuring out
where everyone was at (im from Missouri and not familiar with California) It seems that there were reports of a fireball going across the sky from
south, east and now north all twards the same area.
It's not uncommon with events like this, that there are dependencies between reports, for the reasons that, meteors can be deceptive regarding their
direction of travel, and people are generally not very good at estimating the actual direction. Unless a meteor is seen directly overhead, it can be
difficult for even experienced meteor observers to say which way it was going. It can be worked out if you discard the most unreliable accounts, and
average out the more trustworthy reports. The best way is to analyze photographs/footage taken at known locations.
There are people out there who will already be working on the analysis of reports and images/footage.
This page showing a
map of the distribution of
reports received by the AMS so far might be useful.
I'd also recommend checking out past threads about similar events for clues on how to do this, like this one for example:
NEW!!: Mystery Meteor Flashes Across British Skies
See the links I posted towards the end of the thread, where you can find professorial analysis of the event.
Here.s another:
Meteor Over the United Kingdom
Originally posted by mrsdudara
With two different colors. Im just curious.
Color in meteors is extremely subjective. It's often the case that two (or more people) seeing the same meteor at the same time and from the same
location will describe different colours.
I recall my fellow meteor veteran Norman McLeod mentioning in the past
that observed meteor color is one of the most subjective parameters in
meteor watching. No two people see color the same way at low light levels
or for the very short periods of time that most meteors are seen. My
experience over the years tends to bare him out on that for sure.
Although I usually observe solo now, back in the 70s and 80s, I had many
group watches with both neophytes and experienced folks and rarely would
anyone agree on the color of an observed meteor. Bright fireballs tend to
"shock" the observer also and can lead to emotional reactions and
recollections that may not be entirely accurate.
Source:
METEOROBS (The Meteor Observing mailing list)
If you look over reports of previous fireballs, you will see that in most cases people report different colours:
The American Meteor Society Fireball Logs
Originally posted by mrsdudara
Also, the scientist said this is not related to the up coming meteor shower.. with it being so close to that time frame I wonder why he was so sure.
Aside from this moving slower than the typical meteor, what is the difference between this one and the ones to be expected?
A meteor shower is caused by the dust (meteoroids) ejected from the surface of a comet. Since the comet is orbiting the Sun, those ejected meteoroids
will also be following similar orbits - a bit like a swarm of bees all flying the same direction (if bees flew straight without deviating as they do
in real life). So we have a long trail of meteoroids, effectively following the comet, and flying more or less parallel to each other.
The result of this is that when Earth encounters this meteoroid trail (or "dust trail"), meteors from the same source/comet will
always appear
to travel away from a certain part of the sky that is known as the
radiant. That
is part of the reason why we can classify meteors as belonging to certain showers, or not as the case may be. Another reason is that shower members
will always be traveling at similar speeds (although this is not always obvious since perspective can influence apparent speed very heavily).
In this case, it's obvious that the fireball was not an Orionid, since the Orionid radiant (close to the constellation Orion - which is why they are
called Orionids) was in the Eastern part of the sky at the time of the event, and we have at least one photograph that shows the meteor pointing back
to an area somewhere in the South part of the sky, and obviously not pointing back to the radiant, which it would do if it was an Orionid:
Source:
The American Meteor Society
There is also another good reason why fireballs from meteor showers are unlikely to make it deep enough into the atmosphere for sonic booms to be
heard:
11. Is there a chance of a meteor from a meteor shower or storm reaching the ground as a meteorite, and is it dangerous to observe meteor
storms?
The meteoroids which make up a meteor shower or storm are very fragile in nature, and are composed of a somewhat “fluffy” composite of material
from which all volatile material has escaped, due to many trips near the sun. This material readily vaporizes in the upper atmosphere, and is given
the descriptive name of “friable” material. While quite spectacular to watch, a meteor storm presents no real danger to the viewer, who is
protected by miles of atmosphere.
Source:
The American Meteor Society Meteor Sower FAQs
Having said that, there have been reports of possible booms from meteor shower members during very strong meteor shower activity in the past, but we
know most members of meteor showers are generally too small/fragile to make it to below around 50 km where booms may be heard.
From past experience/recovered meteorites, we know that asteroidal material (which is generally harder/denser than cometary material) is much more
likely to be the cause of the type of event we are discussing in this thread.
edit on 18-10-2012 by FireballStorm because: typos