Re: phase angle vs RA/Dec, time

From: Gerhard HOLTKAMP (
Date: Sat Dec 17 2005 - 13:40:05 EST

  • Next message: Björn Gimle: "5919 Obs 20051217"

    ykchia wrote:
    > Is there any software out there ( or modifed code for existing ones)  that
    >will allow me to LIST the phase angle of a satellite Vs Positions(RA,Dec) &
    >Time  so that i can post match the flashes/location and know the phase
    >angle at each of the flashes from video?  .. this is a bit diff from
    >Iradium flare where the EXACT time and location is known for a SINGLE flash
    I'm not sure whether this is what you want but my SatCal program can display 
    (half) the angle between the direction of the Sun and the direction toward 
    the observer as viewed from the satellite. Given a particular orientation of 
    a satellite surface (inertial or local attitude) it can also display the 
    flare angle which is the angle between the orientation of this surface and 
    the ideal orientation to cause a maximum flare at the observer's location. Or 
    it can do the opposite e.g. displaying the orientation a surface would have 
    to show in order to cause a flare. SatCal does not produce a list of those 
    angles but displays them as you time-step your way along. You can download 
    SatCal from or contact me directly if you have 
    more questions.
    Gerhard HOLTKAMP
    Darmstadt, Germany
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