Re: LB obs 2005 Dec 19

From: Björn Gimle (bg_26934@glocalnet.net)
Date: Tue Dec 20 2005 - 07:47:19 EST

  • Next message: Björn Gimle: "Re: phase angle vs RA/Dec, time"

    65-65C obs is very interesting ; also 97-34C!
    Graphs, also for 03-37C and 97-52C, sent to Leo, available on request.
    -----------------------------------------
    Excluding the last two flashes, 2.727 is a better period for 03-37C,
    with a S.D. of about 0.2/50/sqrt(49) = 0.0007 !
    
    5.70 is no(?) period for 65-65C, 'SYNODIC' suggests
    5.70 - 4.5/11 = 5.30; this gives a very good chart!
    With one exception, the thirteen points that are outside +-0.5 s from
    the main series, form three sequences of secondary flashes, all of them
    four minor cycles apart (true period 21.2 s)!
    Not also that the secondaries I identified correspond to gaps in the 
    main series.
    They appear to have different synodic effects, which I have never
    analyzed mathematically, but seems intuitively possible, if surfaces
    have significantly differing angles to the rotation axis.
    
    97-34C looks like 2.777 s, with three secondary series! The main series
    is extremely exact, +-0.01 s span, secondary at +0.7 s later is +-0.04 !
    Even the ones at +1.5 and +2.2 s are +-0.14 s.
    Looking at your 05-12-16 obs, using a slightly shorter period than this, 
    shows almost the same vertical separations.
    
    97-52C : If your timing is +-0.5 s as claimed, the period is double,
    with asymmetric secondary flash - your laps are +-2 s from your period!
    Period 67.03 s gives spread = +-0.55 and +-0.32 s,
    and asymmety = +1.52 s.
    
    /Björn
    
    ----- Original Message ----- 
    From: "Leo Barhorst"
    ...
    > 65- 65 C 05-12-19 17:16:07   LB   85.5 0.2  15  5.70  FF, 4->i
    > Timings: 3.01 4.53 4.67 5.89 3.28 2.48 5.17 4.18 2.37 3.89 3.25
    > 2.54 4.78 4.11 2.85 3.49 3.73 1.98 5.32 3.73 2.87 3.19 4.18 sec.
    > Difficult to determine a period.
    >
    ...
    > 97- 34 C 05-12-19 16:59:53   LB   25.8 0.2   9  2.87  FF, 3->i, sm, 5
    > Timings: 2.77 [1.64 1.12] [1.58 1.20] [1.38 1.40] [1.39 2.12 1.39](2)
    > [1.39 1.42] [1.43 1.26] [1.46 1.54] sec.
    > As Bjorn pointed out to me regarding my obs of Dec 16th, the period
    > best fitted with Synodic is 1.528 sec. Above timings do not agree
    > with this.
    
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