RE: 4542 SATOBS 12 MAY 2009.

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Wed May 13 2009 - 18:31:35 UTC

  • Next message: David Brierley: "DMB Obs May 12-13"

    Marco Langbroek wrote:
    
    > This while in contrast it also can be very bright. As seen 
    > from Leiden on 11-12 May it equaled the main Big Dipper stars
    > while traversing through that constellation in the zenith,
    > being easily visible by the naked eye even from my town
    > center location.
    
    I have just produced a standard magnitude scatter diagram:
    
    http://www.satobs.org/seesat_ref/misc/09026B_std_mag.jpg
    
    Standard magnitude is 5.3 +/- ~1 (1000 km, 90 deg phase angle). Coefficient of
    phase is high, as expected for an elongated object, in this case ~1.7 mag/rad.
    
    Your mag 2.5 observations of May 11, near 21:51 UTC, were within about the
    margin of uncertainty. Alberto's of May 12, near 21:34 UTC were more than 1 mag
    fainter than the range of the plot, but I expect the scatter to increase as the
    number of observations increases.
    
    Ted Molczan
    
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