Re: Anomalous flare from Iridium 24

From: Kevin Fetter via Seesat-l <seesat-l_at_satobs.org>
Date: Fri, 11 Sep 2015 03:59:56 -0700
Iridium 24 has a bad attitude, ie orientation no longer stable.

So any flare predicted for it, is not to be trusted.

So you would have seen a flash from it, as the angle between you, the sat and sun, allowed for alot of sunlight to be sent your way.

At

https://celestrak.com/NORAD/elements/iridium.txt

It shows, which iridium sat's have bad attiudes, so one's no loger reliable for flaring. Look for a " - " beside the name.

Kevin
--------------------------------------------
On Fri, 9/11/15, Arto Oksanen via Seesat-l <seesat-l_at_satobs.org> wrote:

 Subject: Anomalous flare from Iridium 24
 To: "Seesat-L" <seesat-l_at_satobs.org>
 Received: Friday, September 11, 2015, 5:48 AM
 
 Last night I was taking picture of
 Milky Way and saw a short bright flash
 from a satellite in Pegasus. It was very bright (mag -4 or
 brighter) and
 brief (1 second or less). A faint satellite was visible for
 few tens of
 seconds moving South before fading away.
 
 The flare is well visible on my picture:
 http://www.taivaanvahti.fi/images/uploads/201509/42380_76835df6373c168436ce66da926b1be7.jpg
 
 The path matches well with Iridium 24, but there is no
 predicted flare and
 for a typical Iridium flare this was a very short duration.
 Also the flare
 was seen more than one minute before the satellite should
 have been at the
 flare point. The time was checked from a mobile phone with
 very accurate
 time. It was still 20:02 UT well after the flare.
 
 http://www.heavens-above.com/passdetails.aspx?lat=62.1259&lng=25.7019&loc=Muurame&alt=79&tz=EET&satid=25105&mjd=57275.8346988795&type=A
 
 Flare time: 2015-09-10T20:01 UT
 Observing site: Muurame, Finland (62.1259N, 25.7019E)
 
 Could Iridium 24 have been more than minute ahead of the
 prediction and why
 flaring unexpectedly?
 
 arto
 -- 
 Arto Oksanen
 arto.oksanen_at_jklsirius.fi
 Muurame, Finland
 
 "In a world where I feel so small, I can't stop thinking
 big."
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Received on Fri Sep 11 2015 - 06:03:23 UTC

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