Re: CB Obs May 11, 12 and 15, 2012

From: C. Bassa (
Date: Sat May 19 2012 - 09:24:15 UTC

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    Hi Greg,
    On Sat, May 19, 2012 at 7:02 AM, Greg Roberts <> wrote:
    > What are you using with your Watec ?
    The lens I'm using is a 50mm F/1.8 which I already happened to have.
    It gives me a 7.2x5.3 deg field of view with a pixel scale of about 35
    arcseconds per pixel. Still frames are captured directly onto a
    computer using an EasyCap USB adapter and the frames are timestamped
    off the computer clock in the grabbing software. I have written some
    custom software to 'compress' 250 consecutive frames into a
    'four-frame' FITS file (see section 2.2 in Running at 25 frames per
    second each 'four-frame' comprises of 10s of data.
    > Are you delberately looking for lost satellites or were they "casual" finds?
    Since my horizon is very limited and I am still testing the setup, the
    camera just points at a fixed az/el for each observing session. This
    has the added benefit that once I calibrate the astrometry of one FITS
    file I can automatically transfer the astrometry to all other FITS
    files in the sequence using another piece of code that I wrote. Yet
    another program then overlays predictions from the space-track and
    classified catalogs and I use ObsReduce to measure positions for
    anything that is classified or unidentified.
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