ERS-20 67-040D

From: Greg Roberts <>
Date: Mon, 24 Mar 2014 08:41:06 +0200
Hi Fred
I note your request for updated elements for 67-040D. This satellite was lost by 
the official tracking agencies decades ago despite the fact it still puts out a 
radio signal on 136.260 Mhz.   The satellite is too small to be tracked 
optically . In addition the orbit undergoes large changes in its orbital 
parameters due to solar,lunar and terrestial perturbations. Several years ago I 
did several radio passes and Mike McCants was able to fit an orbit that was good 
enough for radio observations since the satellite could be heard for extended 
periods of time. This is the only orbit that has been produced in the past few 
decades and will be the one that you are using.  Since then the orbital 
parameters will have significantly changed so it will be necessary for someone 
to observe several passes and try and get some useful data such as AOS, LOS or 
better still decent doppler curves and then twist Mikes arm to try and fit an 
orbit. Although I still have my 136-138 Mhz tracking setup I have not monitored 
this band for several years other than occassional weather satellite pictures.

Since there is virtually no chance of it being sighted optically your request 
really should go to the Hearsat newsgroup. It is an interesting challenge for 
someone :-))

Best wishes

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Received on Mon Mar 24 2014 - 01:41:22 UTC

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