Re:Magnitude #22519

Date: Fri Jan 22 2010 - 18:49:56 UTC

  • Next message: Greg Roberts: "Fw: obs 22 Jan 2010-Scott Campbell"

      Thank you for the notes on 22519.  I'll keep it on my target list and implement your suggestions.  (I was beginning to suspect that it was a fake elset designed to frustrate new observers).  I have made numerous attempts to acquire it on a variety of elevations from my site.  Most recently at 57d elevation with a predicted magnitude of 8.3. AS I have observed fainter objects I expected to observe 22519 on this last pass but did not see anything.
    Clear skies
    --- On Fri, 1/22/10, Greg Roberts <> wrote:
    > From: Greg Roberts <>
    > Subject: Re:Magnitude #22519
    > To:
    > Cc:
    > Date: Friday, January 22, 2010, 7:27 AM
    > Hi Jim
    > 22519 (USA 89R) is a funny one.
    > It goes through quite a range of magnitudes and has a slow
    > variability cycle, so can be very faint for a long time.
    > When I tracked it a few days ago I initially did not see it
    > crossing the field of view of the video monitor. A few
    > minutes prior to this I had tried it on an earlier position
    > and observed a satellite on the monitor at about magnitude
    > +8 but ignored it because it was about 90 seconds off the
    > predicted time, so I assumed it was an "unknown" as I had
    > nothing predicted at the time observed.
    > I then proceeded to do a search for #22519, first setting a
    > few minutes ahead of the predicted track-in case it came
    > early, and then waiting past the predicted time for a few
    > minutes in case it was late and saw nothing on the monitor.
    > I then moved my mount to the culmination position and then
    > swept back and forth in azimuth keeping the elevation
    > constant and every 2 degrees or so stopped sweeping and put
    > the mount into auto track mode and tracked for a few
    > seconds. This effectively integrates the image so a faint
    > satellite appears stellar (and a few magnitudes brighter)
    > and the stars trail. This was done using the CCD camera.
    > I did this several times and finally located #22519 and
    > then automatically tracked on it for a few minutes .
    > Initially I could see nothing on the video monitor but by
    > the time I finished my few minutes track on 22519 it was
    > quite easy on the monitor.
    > So, if you dont see it at the first position try another
    > position a few minutes later -- do this often enough, and,
    > provided the satellites is not running too far off, you
    > should eventually see it.
    > Incidentally I was tracking it at a range of about 8000 kms
    > if memory correct.
    > Cheers
    > Greg
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