[amsat-bb] THANKS Re: Where did the TLEs go for BY70-1?

Todd Deckard twdeckard at earthlink.net
Sun Jan 29 12:48:03 UTC 2017


Greetings Mac,

Thanks for this!  

The AMSAT ftp site isn't updated frequently enough for the deteriorating orbit and a single precision PLAN13 implementation on the ATmega1280.  

As an example here's the CELESTRAK output:

BY70-1                  
1 41909U 16083C   17029.24424671  .00506735  24288-5  70240-3 0  9991
2 41909  97.5768 109.7306 0160558 244.2616 114.2002 15.85900257  5044

Here's the AMSAT record sampled from the same time.   

BY70-1
1 41909U 16083C   17026.84471594  .00329730  24344-5  49404-3 0  9999
2 41909  97.5781 107.0760 0167800 253.3870 105.1424 15.83446051  4663

As expected, atmospheric drag has the largest effect on the semi-major axis, eccentricity, and argument of perigee. Alas it won't be long now.  Still haven't gotten a confirmed QSO!

Best
Todd


>Mac A. Cody maccody at att.net 
>Sun Jan 29 02:43:52 UTC 2017
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>Todd,

>Mark KK6OTJ told me that you can find the latest TLEs for BY70-1 by using
>the SATCAT search function at http://www.celestrak.com/satcat/search.asp
>Search using the name BY70-1.
>
>73,
>
>Mac / AE5PH




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