Fw: Re: R: Iridium 6 help!

From: td Fax via Seesat-l <seesat-l_at_satobs.org>
Date: Sat, 20 Aug 2016 16:35:46 +0000 (UTC)
Γιάννης,
Congrats on seeing a double flare!
To add to this,
Iridium 6 and Iridium 51 always travel together (since 2012).
So an easy way to anticipate a double flare is to look out for these two!

You'll see this sometimes with communication satellites that need to be in a set spacing from other similar comsats,
as a close double is a sign of a backup or replacement for a failure or partial failure of the other satellite.
O3B FM2 and O3B FM11, and O3B FM5 and O3B FM3 are other examples of a pair of comsats that travel together.
FM2 and FM5 were shut down as reserves due to low power from failures in power supplies after launch.
http://spacenews.com/41831world-satellite-business-week-two-o3b-satellites-taken-out-of-service/

Here's a site speculating on 6,51:
http://www.rod.sladen.org.uk/iridium.htm

calsky.com is a much better website to use to identify a satellite since it will exhaustively list even faint objects in the area at the time and place set (although a more complicated interface). I prefer to test objects listed in calsky after a search, with heavens-above charts just by substituting in the NORAD id up in the URL address where it fits.


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Received on Sat Aug 20 2016 - 11:39:08 UTC

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