Fwd: PPAS obs 2007-11-23 BD

From: Bram Dorreman (bram.dorreman@gmail.com)
Date: Sun Nov 25 2007 - 01:43:59 UTC

  • Next message: Ted Molczan: "TJM obs of 2007 Nov 25 UTC"

    Observations of satellites with (more or less) periodic brightness
    variations. All observations by 7 x 50 binoculars.
    The reported times are those of the last timed maximum.
    Naked eye observation. Sky was good. Near Full Moon so that observations
    closer than about 30 degrees from this bright light were not performed.
    
    yy-nnncc yy-mm-dd hh:mm:ss.s ooo sss.s s.s nnn ff.fff comments
    73- 54 A 07-11-23 18:42:03.3 BD   19.8 0.3   1 19.8   +5->inv; F'a'; 5)
    79- 57 A 07-11-23 17:36:14.7 BD  132.4 0.2  14  9.46  a'a'F'; +3->inv; 2)
    83- 22 A 07-11-23 18:29:00.4 BD   93.4 0.4   8 11.7   +3.5->inv; 4)
    87- 60 A 07-11-23 17:24:31.4 BD   54.9 0.5   4 13.7   A; +4.5->?
    94- 68 A 07-11-23 16:44:50   BD   34           34     a; +4.3->inv; 7)
    96- 71 B 07-11-23 16:50:25.3 BD  115.8 0.2  10 11.6   A; +5->inv
    99- 57 A 07-11-23 18:59:58.2 BD  101.9 0.2   5 20.4   A'A'A'_A; +5->inv; 6)
    00- 33 D 07-11-23 18:25:22.7 BD   66.3 0.2  14  4.74  A; +5.5->inv
    07- 27 B 07-11-23 17:59:51.1 BD  316.5 0.5   6 52.7   A; ssm; +1.9->inv; 3)
    07- 29 B 07-11-23 17:16:43.5 BD   78.2 0.2  60  1.304 A; +2.5->inv
    07- 38 B 07-11-23 16:53:51.2 BD   30.9 0.2  20  1.54  A; +5->inv
    07- 53 B 07-11-23 17:15:07.7 BD   81.8 0.2  43  1.90  A=>F; +2.5->inv; 1)
    
    1) 2007-053B, 32284, SAR Lupe 3 rocket
      A=>F means photometric appearance evolved from wavy to rather flashy.
    2) 1979-057A, 11416, NOAA 6
      displayed an AAF pattern with two breaks in the series (?). I derived a
      periode by determining the time between two flashy maxima. The maxima are
      in the following data, in which "a" means "round" maximum and
      "f" means flashy maximum:
      7.47 a 1.92 f; sum = 9.39
      2.87 a 4.50 a 2.29 f; sum = 9.66
      2.49 a 4.75 a 2.32 f; sum = 9.56
      2.65 a 4.64 a => phase change?
      2.27 a 2.18 a 4.75 f; sum = 9.20
      2.78 a 2.08 a 2.31 a 2.26 f; sum = 9.43
      2.64 a 2.12 a 2.40 a 2.23 f; sum = 9.39
      2.45 a 2.36 a 2.41 a 2.14 F; sum = 9.36; flash had magn. +3
      4.83 => phase change?
      4.51 a 4.89 a; sum = 9.40
      4.75 a 4.79 a; sum = 9.54
      1.63 f 3.10 a 4.65 ?; sum = 9.38
      4.75 a 4.75 f; sum = 9.50
      4.85 a 2.54 a 2.11 f; sum = 9.50
      4.68 a 2.46 a 2.30 f; sum = 9.44
      I am not an analyst, so my notes may be not very scientific.
    3) 2007-027B, 31701, USA 194 (aka NOSS 3-4) rocket [Centaur]
      At last a long arc with almost zenithal culmination.
      The maxima were easy this times, as there was a short flash on top
      of the wave. May be this flash was not exactly on the maximum brightness
      within a period.
      Is it amazing that the intervals increased with times?
      Timings are:
      46.58 50.61 52.69 54.78 55.33 56.46
    4) 1983-022A, 13923, NOAA 8
      Not as nice as its mate NOAA 6. I tried to determine a combined but
    rather
      constant period and found following:
      f 3.15 f 5.78 a 2.67 sum = 11.60
      f 3.00 f 6.12 a 2.62 sum = 11.74
      f 3.10 f 3.56 a 2.38 a 2.62 sum = 11.66
      a 3.07 a 3.40 a 3.20 m 1.99 sum = 11.66
      a 2.91 a 3.43 ? 5.40 sum = 11.74
      m 2.85 f 3.52 a 5.34 sum = 11.71
      a 2.96 => phase change?
      f 3.16 f 3.31 a 5.17 sum = 11.64
      a 3.52 a 2.39 a 5.71 sum = 11.62
      See further the note at the end of 2)
    5) 1973-054A, 06787, OPS 8364 (aka DMSP 4)
      Together with a not timed 1st interval I get the timings:
      f ~14   f 6.23 sum = ~20
      f 13.80 a 6.00 sum = 19.80
    6) 1999-057A, 25940, CBERS 1
      This object displayed 4 flashes at the beginning, later one flash
      disappeared or was very faint. I presume the real period is the sum
      of the 4 intervals, later three: two short and one long:
      5.33 4.94 5.81 4.17 sum = 20.25
      5.13 5.31 9.92 sum = 20.36
      5.14 5.13 10.19 sum = 20.46
      5.29 5.20 9.82 sum = 20.31
      5.12 5.11 10.31 sum 20.54
      Before these timings I had: 4.93 5.42 4.79 (so missing the 1st max)
      After these timings I had: 4.67 5.43 (so missing the long interval)
    7) 1994-068A, 23323, IRS P2
      is a difficult flasher, when the flashes appear so now and then and
      you don't know when. I found the first flash rather late during the
      transit and was happy to see another one.
    
    The URL explaining the format of PPAS observations :
    http://www.satobs.org/tumble/flashpm.html#PPASformat
    
    Site 4160: 51.27931 N, 5.47683 E (WGS84), 35 m
    Bram Dorreman
    
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