[amsat-bb] AO-7 orbit count.

[Paul Stoetzer]

Tom,

AO-7 was launched on November 14, 1974, that's 15,935 days ago. Multiplying
15,935 by it's current mean motion of 12.53633150 revs/day gets you 199,766
orbits. The orbit number is currently 99,630, so there is a bit of error
there. The mean motion should have very slightly decreased over the past 43
years as the minimal atmospheric drag ever so slightly slows it down.

73,

Paul, N8HM

On Mon, Jul 2, 2018 at 10:03 AM, Tom Schuessler <tjschuessler at verizon.net>
wrote:

> 12.5×365×45 equals 205,312..5. Based on that you think it had Brolley a
> diameter the second time already but it might have been hiring slower when
> originally launched.
>
> Sent from my iPhone
>
> > On Jul 2, 2018, at 02:47, Alan <wa4sca at gmail.com> wrote:
> >
> > Tom,
> >
> > According to the Keps, AO-7 makes 12.54 orbits per day.  It will hit
> 99999
> > on the 30th or so.  You can use the Preview function to find out exactly
> > when.
> >
> > 73,
> >
> > Alan
> > WA4SCA
> >
> >
> > <-----Original Message-----
> > <From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of
> > <tjschuessler at verizon.net
> > <Sent: Sunday, July 01, 2018 23:56 PM
> > <To: 'AMSAT BB' <amsat-bb at amsat.org>
> > <Subject: [amsat-bb] AO-7 orbit count.
> > <
> > <Now I see looking at SatPC32 that it shows AO-7 in the 99,625 range in
> > orbit
> > <count.  If memory serves me right though, doesn't the TLE orbit count
> roll
> > <over at 99,999 (Just like a car odometer), so that would mean that we
> would
> > <be coming up to the 200,000th rev is that right?  If I am right, then
> this
> > <will be coming up in less than a month.  Does anybody know exactly when
> > that
> > <will be?  I am doing a presentation for a local club and would like to
> > throw
> > <out that fact if I could.  Also the day of that event would be good AO-7
> > <operating day I would think.
> > <
> > <73
> > <
> > <Tom Schuessler, N5HYP
> > <EM12ms
> > <
> > <
> > <
> > <_______________________________________________
> > <Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> > <to all interested persons worldwide without requiring membership.
> Opinions
> > <expressed
> > <are solely those of the author, and do not reflect the official views of
> > AMSAT-
> > <NA.
> > <Not an AMSAT-NA member? Join now to support the amateur satellite
> > <program!
> > <Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
> >
>
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>