[amsat-bb] Re: Can we get them to fix AO-40 first then?

Rocky Jones orbitjet at hotmail.com
Thu Oct 15 20:20:17 PDT 2009

Hello Peter and thanks for the reply...sorry mine was so late, busy afternoon.

you answered my question.  I had "heard" that with the arrays folded or based on some failures...that AO-40 did not have 360 degree coverage in solar cells around its spin access.  

If that was the case then the battery was going to be essential for any type of recovery...but since it is not accurate then I agree if the battery will open (do a "seven") then the only question would be the Solar angle.  

Thank you for a very good and straight forward answer  73

Robert WB5MZO

> Date: Thu, 15 Oct 2009 23:30:03 +0200
> From: peter.guelzow at kourou.de
> To: orbitjet at hotmail.com
> CC: samudra.haque at gmail.com; amsat-bb at amsat.org
> Subject: Re: [amsat-bb] Re: Can we get them to fix AO-40 first then?
> Hi Robert,
> that's indeed the big question...   We do not know in which attitude the
> spacecraft is..  is it still spinning very slowly or tumbling?  What is
> the Solar-ß-Angel?
> If the S/C has a good orientation to the sun and the battery opens, than
> there should be enough power to operate the IHU and Beacon etc... do
> some magnetorquing to improve attitude.
> Something like this was done when AO-10 was hit by the last rocket
> stage, spinning the wrong direction with sun directly on top and almost
> no power...
> Unfolding the solar panels would give very high power only when they are
> oriented towards the sun.  With folded solar arrays, all panels around
> the satellite can still see the sun around it's spin axis.
> Only when it shines on top or bottom, we will have problems...
> 73s Peter
> Rocky Jones wrote:
> > Peter.
> >
> > In the current configuration (or the last known config) of the vehicle
> > does the vehicle have sufficient solar illumination to "spin" and
> > maintain the DC busses without a battery?
> >
> > Robert WB5MZO
> >
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