Lunar Iridium Flare #3

From: Ron Lee (
Date: Sat Jun 10 2000 - 10:13:55 PDT

  • Next message: Olivier Staiger: "R: visual satellite newsgroup?"

    Several days ago Rob Matson alerted me to another good Iridium flare
    using moonlight as the source.  Initial conditions made it look
    similar to the first one I saw over a year ago.  It was high in the
    southern sky with the moon almost setting.  It was also at the sleep
    robbing time of 2:10 AM MDT local (810 UT).
    This time I elected to stay up.  After setting up the telescope,
    digital setting circles, I went to a easy to find star nearby and star
    hopped to the expected location.
    I was ready 10 minutes early and my eyes were well dark adapted.  I
    was concerned that it might not be close to the expected magnitude of
    7 since the moon  was just past first quarter.
    The actual time of the flare was 2:10:17.6 local so I made a final
    adjustment of the scope location at 2:10:00 and on time a relatively
    bright Iridium flare (using moonlight) came passing through.
    I am going to estimate that it was 8th magnitude...possibly brighter.
    It might have been visible in binoculars.  The other interesting thing
    is that this was the first that I saw during the entire passage
    through the field of view.  I also imagined that the brightness varied
    a bit but cannot state that it was a true effect.
    The flare occurred about a minute after entering Earth shadow.
    The satellite was iridium 42 (#25077).  I am at 104.5614 W, 38.9478 N,
    2073 meters.
    Ron Lee
    Unsubscribe from SeeSat-L by sending a message with 'unsubscribe'
    in the SUBJECT to

    This archive was generated by hypermail 2b29 : Sat Jun 10 2000 - 10:14:23 PDT