Re: ETS-6 flash predictions

From: Bjoern Gimle (b_gimle@algonet.se)
Date: Mon Mar 06 2000 - 11:07:41 PST

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    I made two small but very significant errors in my model - I should have
    used Satellite-Observer for determining position of normals, and
    Observer-Satellite for predictions, but did it the opposite way. Strangely,
    there were predictions matching "all" observations.
    I was confused though, because the surface causing the prediction for
    Tony's flashes was not the same surface that matched the observation
    in the spin calculation. I added angle tests (Axis-Normal, Normal-Sun and
    Normal-Observer), and they were OK, because all other computations were
    correct (?). It was only matching a drawing to the computed values that the
    sign errors became apparent.
    
    The solution is very neat, the axis is 8h 00m, +89.85 degrees, and cone
    angles 102.5, 99.2, 114.9 Degrees for surface a, b, c (10, 15, 1 obs)
    - the c obs is from Tony's 'neighbour', unless I have an error in
    reducing the observation. (There are also two stray points from Oct.09
    at 91 and 88 degrees, but they could be explained by precession)
    
    The model, and deepsky.txt, have been updated at my web site.
    
    
    -- bjorn.gimle@tietotech.se (office)                         --
    -- b_gimle@algonet.se (home)  http://www.algonet.se/~b_gimle --
    -- COSPAR 5919, MALMA,    59.2615 N, 18.6206 E, 33 m         --
    -- COSPAR 5918, HAMMARBY, 59.2985 N, 18.1045 E, 44 m         --
    -- SeeSat-L / Visual Satellite Observer Home Page found at   --
    -- http://www2.satellite.eu.org/satintro.html      --
    
    
    
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