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Re: Optical Tracking?



Sure, PCsat is object number 26931

bob

On Wed, 3 Oct 2001, Louis A. Mamakos wrote:

>
> Hmm.. that's about 45 arc-minutes per second, which is the whole field
> of view of my CCD camera on a 480mm telescope.   If the moon's not
> up, and there's not much haze, I can probably do on the order of a
> minute or two integration without saturating the CCD detector.
>
> Are there good TLE's around?  I'll plug them into some software here
> (Software Bisque TheSky) and plot the apparent motion through my
> CCD's field of view and see what it looks like.  I may need to find
> a shorter focal length lens for the camera..
>
> I'll also pass this along to a guy in my astronomy club; he's into
> satellite observing, and there's a whole bunch of folks that track
> objects and compute orbital elements for objects which no one admits
> to existing.  This may be an interesting activity for them.
>
> louie
> wa3ymh
>
>
> > It moves through say 90 degrees of arc in about 2  minutes maybe...
> > You should see it witn binoculars, so a viewfinder would work better.
> >
> > bob
> >
> > On Wed, 3 Oct 2001, Louis A. Mamakos wrote:
> >
> > >
> > > Bob,
> > >
> > > I've got a a telescope mount with great positioning accuracy (on the
> > > order of 10 arc minutes or so).  What would be helpful is a back-of-the
> > > envelope computation of what the apparent motion of the satellite is,
> > > say within a 1 degree field of view, and if we'd be likely to see
> > > enough blinks during that time to get meaningful measurements.   So,
> > > we could part our telescope on a part of the sky, and wait for PCsat
> > > to fly through the field, rather than trying to actively track it.
> > >
> > > I don't recall what the computed apparent magnitude was likely to be; but
> > > I suspect that with my 6" f/7 refractor, I ought to be able to see it.
> > > Visually, even in my light polluted area, I can go to at least mag 9 or
> > > better.
> > >
> > > Alternatively, if the apparent motion is small enough, I should be able
> > > to do a long-exposure CCD integration and see the light come and go.
> > > Working backwards, the blinking rate should be computable.  Even with
> > > a 70mm f/6.8 scope, giving a much larger field of view, I suspect the
> > > CCD camera would be able to image the beacon blinking on and off.
> > >
> > > I'd be interested in trying something like this, please let me know
> > > if you continue to pursue this approach.
> > >
> > > louie
> > > wa3ymh
> > >
> >
> > de WB4APR@amsat.org, Bob
> >
> > ISS-APRS FAQ:       http://www.ew.usna.edu/~bruninga/iss-faq.html
> > PCsat Design        http://www.ew.usna.edu/~bruninga/pcsat.html
> > CUBESAT Designs     http://www.ew.usna.edu/~bruninga/cubesat.html
> > APRS LIVE pages     http://www.ew.usna.edu/~bruninga/aprs.html
> > APRS SATELLITES     http://www.ew.usna.edu/~bruninga/astars.html
> > MIM/Mic-E/Mic-Lite  http://www.toad.net/~wclement/bruninga/mic-lite.html
>

de WB4APR@amsat.org, Bob

ISS-APRS FAQ:       http://www.ew.usna.edu/~bruninga/iss-faq.html
PCsat Design        http://www.ew.usna.edu/~bruninga/pcsat.html
CUBESAT Designs     http://www.ew.usna.edu/~bruninga/cubesat.html
APRS LIVE pages     http://www.ew.usna.edu/~bruninga/aprs.html
APRS SATELLITES     http://www.ew.usna.edu/~bruninga/astars.html
MIM/Mic-E/Mic-Lite  http://www.toad.net/~wclement/bruninga/mic-lite.html

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