[amsat-bb] Re: keps age

George Henry ka3hsw at att.net
Sat Feb 19 21:18:59 PST 2011

Open the keps file and look at the first line of data for a given satellite. 
The 3rd number group (the first one with a decimal point in it) is the 
"epoch time" - the date & time when the orbital parameters were calculated. 
The first 2 digits are the year, the next 3 are the Julian date (day # out 
of 365), and the decimal portion is the time, expressed as a fraction of a 

Looking at the current 2-line set on the AMSAT website, all of the 
satellites have an epoch time of either 11047.xxxxx  or 11048.xxxxx, meaning 
they were calculated on day 47 or 48 of this year.

George, KA3HSW

----- Original Message ----- 
From: "Bob- W7LRD" <w7lrd at comcast.net>
To: <amsat-bb at amsat.org>
Sent: Saturday, February 19, 2011 10:09 PM
Subject: [amsat-bb] keps age

> How does one determine the age of the keps in a computer?
> 73 Bob W7LRD

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