Re: NOSS formations

From: gprichard (
Date: Sun Jul 25 2010 - 06:59:59 UTC

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    Another formation is Grace 1 & Grace 2.
    ----- Original Message ----- 
    From: "Jim Blackhurst" <>
    To: <>
    Sent: Sunday, July 25, 2010 12:51 AM
    Subject: NOSS formations
    > Hi Guys.
    > Over the next few months, as the nights get a bit darker I'm hoping to
    > some sightings of NOSS pairs and triplets.  I've been doing some
    > and trying to find out which of the NOSS satellites are still in
    > but I'm not sure I've got the full picture.  I started by looking for
    > on Seesat-L, but I find searching for content difficult (do you use
    > site search on the archive?).  The Seesat page on NOSS suggests that
    > is a surviving triplet from the NOSS 1 generation, and one from the
    NOSS 2
    > generation, but I don't know how old this information is.
    > I've listed the NOSS satellites that are in orbit (and known to be
    > and run a search on each one on Heavens Above.
    >  By choosing and arbitrary date (tonight!) and looking for the time of
    > altitude for each satellite of each group, I've tried to determine if
    > are still in formation or not. I've compiled a small (google docs)
    > spreadsheet with this data here:
    > >From this I can't see any triplets still in formation, although it
    > like quite a few of the doubles are still quite tight.  Does anyone
    know if
    > this is accurate, are there any triplets still in tight formation?  I
    saw a
    > triplet about 2 years ago, but that was a random chance.  Does anyone
    > of a site where I can get current data on the state of the formations?
    > On a related note, I'm also keen on seeing other satellite formations,
    > although the NOSS groups are famous for their closeness, are their any
    > less well known (but still naked-eye) satellites groups in formation?
    > understand that Iridiums sometimes have a spare in close proximity to
    a live
    > sat, and can be the cause of dual iridium flares.  Is there any system
    > for predicting these dual flares?
    > Thanks for your time with this, should I have anything of value in my
    > observations, I'd love to give them back to the community.
    > Jim
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