Re: Obs Jul 18

From: Björn Gimle (b_gimle@algonet.se)
Date: Sat Jul 19 2003 - 07:09:10 EDT

  • Next message: Michael McCants: "OIG Catalog Action Report for the week ending July 19"

    Plotting "absolute" flash times in SYNODIC this looks like an unusually
    quick (for a Zenith-2) synodic (or phase?)  shift. (BTW, adding the laps,
    I get 226.5 - not 224.5 - recording absolute timings has a reduced
    uncertainty - "which, and how many, laps were incorrect, or just the
    sum?")
    
    There is only one transitional flash, at 120.92 s cumulative. Flashes
    before that one are recorded 2.36 to 0.88 s early wrt a multiple of 7.48;
    after that one they are 0.69 to 1.49 s late.
    
    Increasing the estimated period to 7.52 slightly evens out the spread -
    1.76 to 0.60 and 0.30 to 1.25 s, and the plot look quite convincing.
    
    Assuming a triple period (22.55 s) there are of course three separate
    bands, each showing the phase shift. The individual spreads of the
    before/after timings are now 0.70 0.61 0.77 0.49 0.78 0.60, as opposed to
    1.48 vs 1.16 0.95 s.
    
    With ~6-fold period (45.30 s) the largest spread is 0.67 s, but this has
    absurdly low statistical significance, with only two or three
    observations in each section.
    
    The "phase shift" was high in the N.
    
    For 02-54C, except for the 61st flash, the spread is only 0.53 s.
    2x 3x 4x period does not significantly reduce this, and there is no
    indication that either of the "secondary" series in those differ in phase
    from others.
    However, the last 8 flashes are clearly grouped some 0.3 s later than the
    average of the middle 60 flashes, with a final period of perhaps 2.12 s.
    There is a similar cluster of the first 18 flashes, some 0.2 s later than
    the average, making the initial period about 1.95 s.
    This change is too large to be synodic unless the period is a large
    multiple. And according to my (oldish) elset, the middle 60% were from 22
    to 54 deg alt in the N !?
    
    ----- Original Message ----- 
    
    > 01- 56 F 03-07-18 22:11:48   LB  224.5 0.5  30  7.48  AA, 4->7
    > Timings: 6.36 8.58 7.28 6.88 8.06 7.53 7.54 7.52 7.93 6.96
    > 7.17 7.82 7.68 7.50 7.54 8.57 8.23 7.70 7.83 6.85 7.71 8.05
    > 7.39 7.23 7.44 7.80 7.41 7.50 7.41 7.03 sec.
    > Large differances in induvidual timings.
    >
    > 02- 54 C 03-07-18 22:25:41   LB  202.1 0.2 100  2.02  FF, 4->i
    > Timings: 2.05 2.10 1.81 2.03 2.11 2.05 1.81 2.16 2.00 2.05
    > 2.22 1.79 1.99 2.04 2.04 2.03 2.11 1.99 1.85 2.02 1.94 2.09
    > 2.12 1.98 2.00 2.00 1.85 2.20 2.08 2.04 1.99 2.12 1.92 1.99
    > 1.97 2.17 1.93 2.03 1.97 1.99 1.99 2.14 1.98 1.95 2.11 2.14
    > 1.88 1.89 1.97 2.21 1.93 2.18 2.07 1.97 1.96 2.03 1.89 2.13
    > 1.88 1.85 2.13 2.12 2.12 2.03 2.08 2.26 1.94 1.95 2.07 1.89
    > 1.89 2.16 2.08 1.88 2.00 1.94 2.11 2.13 2.04 2.04 2.03 1.94
    > 2.07 2.09 1.95 1.98 2.02 1.94 2.05 2.01 1.92 2.14 2.24 1.97
    > 2.11 2.05 1.95 2.05 2.04 1.92 sec.
    > Nice flasher.
    >
    
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