[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: Optical Tracking?

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.


> 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

Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org