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@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@gmail.com] <Sent: Monday, July 02, 2018 11:29 AM <To: APBIDDLE@MAILAPS.ORG; 'Tom Schuessler' tjschuessler@verizon.net <Cc: 'AMSAT BB' amsat-bb@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@verizon.net] <> <Sent: Monday, July 02, 2018 09:03 AM <> <To: APBIDDLE@MAILAPS.ORG <> <Cc: AMSAT BB amsat-bb@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@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@amsat.org] On Behalf Of <> <> <tjschuessler@verizon.net <> <> <Sent: Sunday, July 01, 2018 23:56 PM <> <> <To: 'AMSAT BB' amsat-bb@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@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@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@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