Re: Anomalous flare from Iridium 24

From: Arto Oksanen via Seesat-l <seesat-l_at_satobs.org>
Date: Fri, 11 Sep 2015 14:15:01 +0300
Thanks for the info!

arto

2015-09-11 13:59 GMT+03:00 Kevin Fetter via Seesat-l <seesat-l_at_satobs.org>:

> 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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-- 
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 - 06:15:34 UTC

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