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Re: AO-7 -- Sun Synchronous orbit



If memory serves the bird was ITOS-G...

It had another "rider" as I recall...INSAT or something like that.

Robert


>From: gregory.beat@attbi.com
>To: amsat-bb@AMSAT.Org
>Subject: [amsat-bb] AO-7 -- Sun Synchronous orbit
>Date: Thu, 27 Jun 2002 14:15:33 +0000
>
>If memory serves, AO-7 was piggyback a NOAA polat
>orbiting weather satellite launch (1974 from Vandenburg
>AFB, CA).  These satellites have an orbital requirement
>for consistent lighting (sun angle) on each orbital pass.
>
>NOAA-M (June 24th most recent launch)
>http://www.space.com/missionlaunches/titan2_launch_020624
>.html
>
>w9gb
> > > I finally remembered the jargon phrase. AO-7 is in a
> > > sun-synchronous orbit;
> > > this is designed to *always* come over at the same local time
> > > am and pm
> > > (its one of those things you get from an orbit at that
> > > inclination). After
> > > a few years the actual time drifts but the "same time, am and
> > > pm" characteristic
> > > still persists.
> > >
> > > AO-7 looks like its in a 7-8 o'clock configuration and, for
> > > all of us in the
> > > northern hemisphere, its summer so its daylight at both the
> > > am and pm times.
> >
> > It's actually more like 08:30/20:30 local. You missed an hour because 
>you
> > applied the summer  (a.k.a. daylight savings) time correction. When it 
>was
> > launched it was a "9AM/9PM" orbit, and it looks to me like it has only
> > precessed about a half-hour (i.e. ~1 minute/year).
> >
> > Tom
> >
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
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>----
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Robert Oler WB5MZO Houston TX


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