[amsat-bb] Re: ISS Keps

[Alan P. Biddle]

Tim,

The font of all Keplerian knowledge, except for some of the satellites which
do not have their's published for security or other matters, is Space Track.
Space Track feeds Celestrak.  There can be a few hours lag as the updates
propogate through the systems, and software updates.  Usually no more than
6-8m hours.  Both SATPC32 and HRD used Celestrak Keps, but they can, and do,
use the NASA.ALL Keps.  It depends on how you have them configured.  No
mystery, really.

73s,

Alan
WA4SCA



-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Tim Goodrich
Sent: Thursday, October 06, 2011 2:45 PM
To: amsat-bb at amsat.org
Subject: [amsat-bb] Re: ISS Keps

I think there may be something more to this. You're saying celestrak keps
are as correct and up to date as the online tracker. However, both HRD and
SatPC were wrong for me last night and I know HRD uses celestrak keps, which
I know were less than 12 hours old, if not only a couple hours old. 

If it helps to decode this mystery, I know my friend running NOVA had the
correct info for the ISS pass last night. 

Tim
K6TW

-----Original Message-----
From: Alan P. Biddle [mailto:APBIDDLE at UNITED.NET] 
Sent: Wednesday, October 05, 2011 2:00 PM
To: 'Kevin Deane'; amsat-bb at amsat.org
Subject: [amsat-bb] Re: ISS Keps

Kevin,

The NASA.ALL Keps are issued and updated weekly, normally Friday, as they
have been for literally decades.  The on line tracker widget gets Keps
directly, and so will be as up to date as Celestrak and Space Track.  Two
different systems, and purposes, which is why there is a difference.  

You will see a similar situation with ARISSat-1 as it slowly descends.
Which is a good chance to get another plug in for the Chicken Little
Contest.

73s,

Alan
WA4SCA





-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Kevin Deane
Sent: Wednesday, October 05, 2011 3:33 PM
To: amsat-bb at amsat.org
Subject: [amsat-bb] ISS Keps


So here we are again, Amsat shows the ISS in the right spot but the keps it
gives out for automatic updates are around 6 minutes off again. I know about
the boosting and why they are off, just dont ubderstand WHY they are good on
the online tracker and not anything else?

Kevin
KF7MYK

 		 	   		  
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