Re: 4/24/01 AM Obs from Orlando [Mars Odysy R/B 1]

From: Tony Beresford (
Date: Tue Apr 24 2001 - 06:42:36 PDT

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    At 19:59 24/04/01 , Brad Kostelny wrote:
    >Hey all:
    >I appreciate your feedback concerning Mars Odyssey R/B 1.  I went out this 
    >morning armed with a good near-zenith plot, and I took a look at a 
    >star-chart overlay showing the booster flying close to Vega.  I just came in 
    >from this observation and saw nothing.  Either the elsats I am using or 
    >wrong, or the booster is to darn dim to see.  However, if the estimate of 
    >mag. ~3 holds, I should be able to see it.  I tracked Cosmos 1689 R/B this 
    >morning in a beautiful horizon-to-horizon pass, and H-A listed this booster 
    >as mag 3.8 .. so Mars Odyssey R/B should be an easy object.  =)
    Brad, Alan Pickup has assigned a standard mag of 5.5 for this object
    in his select listings. I assume he used observations of other recent delta
    second stages. Looking at the pass you tried near 6 am your time this
    morning via H-A, and the sun was only 10.8deg below horizon,
    the range was 1600Km and I would think the phase angle was near 90. 
    So the brightness would have been about mag 6.5, not easy to see in
    a fairly bright sky.
    Tony Beresford
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