Chasing Calipso - Laser Observation 2006-10-18

From: Gregg Hendry (
Date: Fri Oct 20 2006 - 01:24:29 EDT

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    The Calipso laser was observed under cloudy conditions on 2006-10-18 09:13:50 UT near a predicted sub-satellite ground track passing through Lat 39.90217 deg, Lon -105.60360
    Conditions were quite cloudy and snow was falling at a rate of about one centimeter per hour.  The cloud ceiling was indistinct but seemingly no higher above ground level than 600 meters.
    An observer located 200 meters east of the sub-satellite ground track saw 4 to 5 easy to see pale green spots flash by north to south.  The spots were about 5 degrees in diameter, centered roughly 15 degrees apart and seemed to be east of straight up by 5 degrees.  The spots were roundish with indistinct edges and uniformly lit.
    An observer 400 meters east of the ground track also saw 4 - 5 easy to see uniformly lit spots flash by apparently right overhead.  The spot nearest zenith seemed brighter.  All were about 5 degrees in diameter and were round with remarkably distinct edges.  A digital camera nearby recorded nothing at f2, ISO 400.
    G. Hendry
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