RE: Messenger non-obs

From: Ted Molczan (
Date: Wed Aug 04 2004 - 06:21:05 EDT

  • Next message: Ted Molczan: "RE: Messenger non-obs"

    Brian wrote:
    > I attemped to observe the Messenger spacecraft this evening 
    > from my well lit skies of Orange Country, CA but had no luck.
    > Using the Horizons ephemeris generator and sky chart software 
    > I star hopped to the right area and observed through my 6 
    > inch newtonian at 30x. Limiting magnitude was close to 11 
    > until the moon rose high enough to start lighting up the 
    > moisture in the air.
    > Using Ted's formula I had a predicted magnitude of 10.3 but I 
    > was unable to see it.
    It was much fainter than that.
    For your location, on 2004-Aug-04 at 04:00 UTC, Horizons predicted:
    RA/Dec 19 24 28.87 +32 31 18.6
    Az/El  82.2123  59.9015
    Delta 0.0023719032  A.U.
    S-T-O 54.3828 deg
    My formula (see URL below) estimated mag 19, accurate to within one or two
    Ted Molczan
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