[amsat-bb] AO-7 orbit count.

[Pedro Converso]

Hi all,

Nice idea to celebrate AO-7 200th orbit anniversary, our beloved
grandfather bird merits it.

Looks that 200k orbit will happen around August the 1st see:
http://amsat.org.ar/ao7-200k.gif .

http://amsat.org.ar/pass?satx=ao-7 account for orbits above 100k.

We hams should be thankful to have AO-7 alive, duly recognizing those
that made it possible .

73, LU7ABF, Pedro

On 7/2/18, Alan <wa4sca at gmail.com> wrote:
> Greg,
>
> Fortunately this is not a TEOTWAWKI Y2K issue.  Unlike most of the other
> numbers in the Keps, the orbit count has nothing to do with predicting the
> orbit, and can be completely ignored.  Some programs do that.  Others
> compute backwards and forwards from the reference epoch and orbit number in
> the Keps they are using.  I am most familiar with SatPC32, and when working
> on prelaunch Keps recently, I found that if you ran it backwards in time
> before the launch, it will happily show negative numbers.  ;)
>
> The problem is that when the specification for the Keps we use was created,
> it only allowed 5 digits for the orbit count.  That seemed enough, and
> comes
> from Space Track that way.  So like an odometer it just rolls over.  In
> principle, software could look for that, and automatically compensate.
>
> I can't speak for all the software out there, but in most cases they will
> just roll over and keep on tracking.
>
> 73,
>
> Alan
> WA4SCA
>
>
>
>
> <-----Original Message-----
> <From: Greg D [mailto:ko6th.greg at gmail.com]
> <Sent: Monday, July 02, 2018 11:29 AM
> <To: APBIDDLE at MAILAPS.ORG; 'Tom Schuessler' <tjschuessler at verizon.net>
> <Cc: 'AMSAT BB' <amsat-bb at amsat.org>
> <Subject: Re: [amsat-bb] AO-7 orbit count.
> <
> <Hi Alan,
> <
> <Other shoe, please?  What happened to the world's prediction software
> <(if, indeed, we even had any back then) when it rolled over?  What is
> <expected this time?
> <
> <We survived Y2K, but did we learn anything from it?
> <
> <Greg  KO6TH
> <
> <
> <Alan wrote:
> <> Tom,
> <>
> <> It has in fact turned over once already.
> <>
> <> 73,
> <>
> <> Alan
> <> WA4SCA
> <>
> <> Sent from my Waring blender.
> <>
> <>
> <> <-----Original Message-----
> <> <From: Tom Schuessler [mailto:tjschuessler at verizon.net]
> <> <Sent: Monday, July 02, 2018 09:03 AM
> <> <To: APBIDDLE at MAILAPS.ORG
> <> <Cc: AMSAT BB <amsat-bb at amsat.org>
> <> <Subject: Re: [amsat-bb] AO-7 orbit count.
> <> <
> <> <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
>
>
> _______________________________________________
> 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
>