[amsat-bb] Gold Standard for Keplerian Data

Erich Eichmann erich.eichmann at t-online.de
Sun Nov 23 17:45:25 UTC 2014

I compared the results of the pass prediction from the AMSAT website for 
the next 10 passes of FO-29 with the results of WinListen (that comes 
with SatPC32) for my location (8.9 degrees east, 51.94 north). The 
results are exactly the same (WinListen rounds the AOS/LOS times to the  
closest full minute, however). It requires to enter and save your QTH 
locator or longitude/latitude.   I used the latest file nasa.all as Keps 

in most cases of different results between the AMSAT pass precition and 
SatPC32  wrong longitude/latitude values in menu "Setup", "Observer" or 
"Setup" of WinListen or  different  Keplerian data were the reason.

What is your 6-digit QTH locator (or longitude west and latitude 
north)?  What is the entry in SatPC32, menu "Observer" and in WinListen, 
menu "Setup"?
  What Keps file do you use?  Download  the Keps file you use from 
SatPC32 menu "Satellites", "Update Keps". When the download is 
successful click "Quit" and then "OK". The path to the Keps files folder 
can be seen in the foot line of menu "Satellites", the file date in the 
bottom line of the SatPC32 main window and in the left list of the menu 
you can choose the file. WinListen will use the same same path (foot 
line in menu "Listen").

73, Erich, DK1TB

Am 23.11.2014 17:04, schrieb Steve May:
> I have noticed that when I update the Keplerian Data for my location on
> SatPC32 and generate a list of passes they all seem to be about 5 minutes
> different than the predictions from the AMSAT website. This is for the
> earliest pass, and I am using the exact GPS coordinates for my location.
> So which do I rely on? Which predictions should I consider the "gold
> standard" for passes?
> Steve, W5IEM
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