Re: Decay of Molniya 1-79 20949

From: Denis (boucherd@telusplanet.net)
Date: Thu Aug 25 2005 - 11:01:20 EDT

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    As stated, it is a satellite program I wrote. The decay prediction is 
    not very accurate, worst with satellite such as Molniya. The data is 
    used in the prediction to sometimes prevent unnecessary calculations. I 
    have this item on my list of future improvements when time permits. 
    Efforts are taken presently to add LX200 and other goto scopes tracking 
    capabilities. I am beta testing these functions.
    
    If someone wish to contribute to the free program's improvements, you 
    are welcome to help.
    
    Denis
    
    Fco. Javier Iruretagoyena wrote:
    > EOO = Earth Object Orbit, perhaps???? 
    > 
    > -----Mensaje original-----
    > De: b_gimle@algonet.se [mailto:b_gimle@algonet.se] 
    > Enviado el: jueves, 25 de agosto de 2005 13:21
    > Para: woodl@telus.net; seesat-l@satobs.org
    > Asunto: Ang: Re: Decay of Molniya 1-79 20949
    > 
    > (What is EOO?)
    > 
    > The 4+ SpaceTrack elsets for Molniya 1-79 on day 214 have a MM just over 2,
    > a perigee just over 100 km, and a drag term near .0036
    > 
    > The elset for day 235 has MM~5.59 and perigee just 2 km lower, but drag
    > reduced to .000005!
    > 
    > This can partially be explained if drag tore away the solar panels, but to
    > make Mike's INT2x produce the new MM, I have to set the initial drag about
    > 10x larger.
    > 
    > This results in a perigee of 70 km, and drag .125 for day 238.
    > 
    > To account for a one degree diff in RAAN, I must assume that drag was lower
    > (?) initially, so the dip in perigee occurred at a later time.
    > 
    > ...
    > 
    >>EOO using a 2 day old tle predicts Molniya 1-79 (20949) not to decay 
    >>for some
    > 
    > years.
    > 
    >>Larry
    > 
    > 
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