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RE: (meteorobs) Fwd: [Astronomer] Observation -- Possible meteorite?

The only problem with the GSOC website is that it does not list the out of 
control tumbling Iridiums. These are the ones most likely to be easily 
confused with a point meteor. I'm sure most of us have seen a normal 
Iridium...lasting 10-20 seconds, depending on how long you follow it after 
the bright flare. They also have a smooth ramp up and down of brightness, 
with a little specularity at the brightest point. Tumblers are another 
matter. They can last just a few 10ths of a second, and also have very 
sharp "on" and "off" edges to the brightness. Very point meteor like. Of 
concern as well are the dozens of other objects (mostly rocket bodies) 
which also flash, and are also not on the GSOC site. While when the object 
first starts spinning it is very rapid, making ID as a man made object 
easy, after a period of time they slow down due to gravitational and 
electromagnetic effects...hence the period can become quite long...the 
longest I've been able to detect is about a minute. These can be very short 
flashes at nearly any brightness.

Wayne

----------
From: 	Dave Hostetter[SMTP:dhostetter@eateldot net]
Sent: 	Sunday, October 31, 1999 3:15 PM
To: 	meteorobs@jovian.com
Subject: 	Re: (meteorobs) Fwd: [Astronomer] Observation -- Possible 
meteorite?

Hi, list:

Sorry for the delay in responding about Iridium flares.  I've been away 
from
the computer for a couple of days.  I agree about being careful to check on
them for point meteors, particularly bright ones.  I have seen a couple of
flares when I wasn't expecting them, and they really are surprising!

The site I use most often for predictions is from the German Space
Operations Center at http://www.heavens-above.com/ .  Follow the 
directions,
put in your observing location, then bookmark that -- every time you go
there, it will remember your location.  This site gives satellite and
Iridium predictions for days in advance, and Iridium flares for the past 48
hours, too.  I find it to be very accurate.

Dave Hostetter

----- Original Message -----
From: Wayne T Hally <meteors@eclipsedot net>
To: <meteorobs@jovian.com>
Sent: Saturday, October 30, 1999 11:06 AM
Subject: RE: (meteorobs) Fwd: [Astronomer] Observation -- Possible
meteorite?


> Thanx Dave, for  checking that. I find that almost all poimnt meteors and
> alleged "gamma ray bursts" are satellites now. Any point meteor report
> should be checked against the Iridium or other flaring/flashing satellite
> locations.
>
>

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