Re: Decay Forecasr ROSAT

From: Paul Salanitri (
Date: Sat Oct 22 2011 - 03:21:25 UTC

  • Next message: Jim Scotti: "Re: Decay Forecasr ROSAT"

    Hi Jim,
    Would you have a time (to the second if possible) of the near zenith pass?
    (Can you also calibrate camera time [photo a time source])
    This will help in working out how much the TLEs have drifted by.
    I think if we can get this, we can tune up the TLE prediction (and not have
    to wait for space-track).
    Paul Salanitri
    On Sat, Oct 22, 2011 at 12:04 PM, Jim Scotti <> wrote:
    > Just got through watching a pass of ROSAT almost straight overhead (Heavens
    > Above predicted 90 degree elevation at max) from Kitt Peak.  Unfortunately,
    > clouds covered most of its path overhead but I caught 2 brief glimpses as it
    > passed near our zenith.  It was brighter than predicted - and a bit orangish
    > in color but otherwise appeared to be pretty close in time to the H-A
    > prediction.  I was expecting it to be early and was thinking I must have
    > missed it due to the clouds when I caught sight of it thru a small break in
    > the clouds.  I tried to pick it up later but the clouds kept it hidden, so I
    > didn't check my watch for timing until around a minute after I saw it.  I
    > had my camera with fisheye lens taking exposures, but I haven't downloaded
    > them to see if I got it yet.
    > Jim.
    > It is difficult to say what is impossible, for the dream of yesterday is
    > the hope of today and the reality of tomorrow. - Dr. Robert H. Goddard
    > ----------
    > Jim Scotti
    > Lunar & Planetary Laboratory
    > University of Arizona
    > Tucson, AZ 85721 USA       **
    > jscotti/ <>
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