Re: [amsat-bb] Orbit Number Trivia Question

["Kenneth J. Ernandes" <n2wwd@xxxxxxxxxxxxxx>]

Jim -

NOVA computes the orbit number from the TLE (i.e., rev number at epoch is
provided in the TLE).  When I was working with NORAD/Space Command to help
them anticipate AO-40 thruster firings, the Command Stations indicated a rev
number count discrepency, which I believe I had NORAD correct at the time.

However, the person I was working with at NORAD indicated that rev number is
relatively unimportant to them and that there current computer system
sometimes develops miscounts, particularly with high eccentricity orbits.
She therefore could not promise that they would not get out of sync in the
future.

73, Ken N2WWD



----- Original Message ----- 
From: "James Tudehope" <James@Tudehope.com>
To: "Amsat Mailing List" <amsat-bb@AMSAT.Org>
Sent: Wednesday, December 31, 2003 9:57 PM
Subject: [amsat-bb] Orbit Number Trivia Question


> While RXing telemetry this evening I noticed from AO-40 it shows the orbit
> number is 1455.   When I look on NOVA it shows orbit number is 1456.  I
> observed that under the configuration set up for the text display offers
two
> methods for the orbit number being @ perigee or @ ascending node.  I tried
> both of those settings and my orbit# still shows 1456 when the telemetry
> shows 1455.   I switched my NOVA to UTC to check if that makes any
> difference, it didn't.
>
> Does anyone have the answer why NOVA shows the orbit number different than
> what is from the telemetry ?
>
> Best regards,
>
> Jim KL7QR
> Ham Site: http://members.cox.net/jtudehope/KL7QR.htm
> ----
> Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
> Not an AMSAT member? Join now to support the amateur satellite program!
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

----
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org