Re: Flashing Sphere, Magnitudes in Calsky

From: Bjoern Gimle@GlocalNet (Gimle@GlocalNet)
Date: Sun Oct 26 2008 - 17:41:46 UTC

  • Next message: Arnold Barmettler: "RE: Flashing Sphere, Magnitudes in Calsky"

    A) Many "spheres", including Vanguards, have flat solar cells scattered 
    across the surface.
    Others, like EGP, have prism reflectors for laser ranging.
    
    ----- Original Message ----- 
    From: "npr61" <npr61@bellsouth.net>
    To: <SeeSat-L@satobs.org>
    Sent: Sunday, October 26, 2008 6:14 PM
    Subject: Flashing Sphere, Magnitudes in Calsky
    
    
    > Hello Folks:
    >
    > I've been subscribing since Feb '08 and do casual, simple obs with 70mm 
    > bins and H-A pass charts.  A couple of questions:
    >
    > (a) How can a sphere flash?  Obs from (5) passes of Vanguard 2 (59001A / 
    > 00011) in Feb & Mar '08 revealed an approx. 5-sec flash period.  This from 
    > a 20" dia. sphere with a handful of antennae?
    >
    > (b) Are CalSky mag predictions known to be overly conservative (bright)? 
    > I'm new to CalSky, and find what appear to be extremely generous values 
    > for old objects that H-A simply lists as "?".  E.G. -  I've glimpsed 
    > Calsphere 1 (64063C / 00900) at 1,100 km distance, a 30-degree phase 
    > angle, and with a guesstimated magnitude in the 9's.  Not surprising, 
    > based on a rough comparison of its 0.36m dia. against King-Hele's mag 8.0 
    > for a 1-meter sphere at 1,000 km and 90-degree phase angle.  For this 
    > pass, Calsky listed the object at mag 4.6 (!).
    >
    > Any guidance would be appreciated.
    >
    > Neal Robichaux
    > 29.9884N
    > 92.1498W
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