BD PPAS obs 2008-06-16/20

From: Bram Dorreman (bram.dorreman@gmail.com)
Date: Sun Jun 22 2008 - 20:52:49 UTC

  • Next message: Alberto Rango: "4641 SATOBS 21 JUN 2008."

    Observations of satellites with (more or less) periodic brightness
    variations. All observations by 7 x 50 binoculars, unless otherwise stated.
    The reported times are those of the last timed maximum.
    Unless they have format hh:mm(:ss) then it is an approximate time.
    
    yy-nnncc yy-mm-dd hh:mm:ss.s ooo sss.s s.s nnn ff.fff comments
    66- 89 A 08-06-19 22:46:47.2 BD  138.2 0.2   2 69.1   F'aa; +5.0->inv; 11)
    90- 17 B 08-06-16 22:54:09.8 BD  165.6 0.1  24  6.90  A; +5.0->inv
    92- 52 A 08-06-16 23:06:42.7 BD  220.7 0.7   8 27.6   FaA'; +1.0->7.8;
    4) 94- 89 A 08-06-16 22:06:17.5 BD  107.8 0.1  26  4.15  A; +5.0->inv
    96- 37 A 08-06-19 21:56:16.9 BD                34     +7.0->inv; 9)
    96- 49 A 08-06-17 23:24:29.1 BD   55.4 0.2  12  4.61  ffFff'_;
    +2->inv; 7) 97- 30 F 08-06-18 01:06:52.0 BD   92.6 0.2   3 30.9   Irr;
    0->inv; 8)
    99- 23 B 08-06-17 22:31:54.5 BD  149.1 0.2  35  4.26  A; +7.5->inv 99-
    28 C 08-06-17 23:11:28.0 BD  139.8 5     2 70     A; +6.5->7.8; 6) 02-
    24 A 08-06-16 21:23:34.2 BD  183.2 0.2  14 13.08  a_aA'; +4.2->inv; 1)
    02- 46 B 08-16-20 01:06:40.8 BD   78.9 0.2  25  3.16  F; +5.1->inv
    03- 09 B 08-06-17 21:23:48.6 BD  136.4 7     3 45     A; +1.0->5.5; 5)
    03- 09 B 08-06-19 22:06:35.5 BD   92.3 2     3 46     A; +3.7->7.0; 10)
    06- 26 A 08-06-16 21:31:44   BD   38   2     2 19     a; +0.5->3.3; 2)
    07- 06 C 08-06-17 21:48:20.2 BD   63.6 0.2  10  6.36  A; +3.2->inv
    07- 12 D 08-06-17 21:17:19.0 BD   13   0.2  13 42.2   A; +7.5->inv
    07- 29 B 08-06-16 22:19:36.7 BD  336.5 0.2  65  5.178 A; +2.1->5.5; 3)
     07- 30 B 08-06-17 00:20:39.6 BD   40.7 1     1 41     A; +4.5->inv
    08- 14 B 08-06-16 21:30:21.2 BD   97.9 0.2  35  2.80  A; +5.3->inv
    08- 14 B 08-06-17 21:03:39.0 BD  118.4 0.2  42  2.82  A; +3.2->inv 08-
    25 E 08-06-17 00:07:06.5 BD   62.4 0.2  20  3.12  A; +6.8->inv
    08- 25 E 08-06-18 00:33:22.9 BD   74.3 0.2  23  3.23  A; +6.5->inv
    08- 26 B 08-06-17 22:05:23.0 BD  165.1 0.2  13 12.70  A ssm; +4.5->8.1
    The URL explaining the format of PPAS observations :
    http://www.satobs.org/tumble/flashpm.html#PPASformat
    Notes:
    1) 2002-024A:
     initially the flash pattern was:
     faint max followed by a double max of which the 1st was also faint.
     This pattern was sometimes replaced by two equal max
     At the end all periods had equal intervals and max.
     Timings in which groups are distinghuised:
     4.38 + 8.49 = 12.87 (faint + faint-max)
     6.21 + 6.40 = 12.61
     4.93 + 8.34 = 13.27
     4.79 + 8.15 = 12.94
     4.65 + 8.55 = 13.20
     6.26
     13.11               did I miss two maxima?
     6.83  6.71 + 6.71 = 13.42
     5.68 + 7.45 = 13.13
     6.67
     19.30               no max in between!  6.54 + 6.88 = 13.42
     6.14 + 6.94 = 13.08
     6.62 + 6.43 = 13.05
    
    2) 2006-026A:
     Observed as unid. Flash period determined from voice recording.
     Afterwards identified.
    
    3) 2007-029B:
     After culmination this object showed secondary maxima as flashes
     every other interval.
    4) 1992-052A:
     With knowledge of an about 27 seconds period determimed in one of my
     previous observations I derived the following:
     Timings + appearances + magnitude (sometimes)
      4.93 a 4
      5.07 F 1
     20.48 a    sum = 30.48
      6.87 f 7
      1.92 f 7
     20.16 a    sum = 28.95
      6.17 f 7
     19.51 a    sum = 25.68
     13.57 a
     14.39 a    sum = 27.96
      6.09 f 5
      8.24 a
     10.98 a    sum = 25.31
      7.22 a
      6.72 a
     14.31 a    sum = 28.25
      5.69 a
      6.87 f 3
     13.27 a    sum = 25.83
      7.20 a
      5.66 f 4
      7.82 f 3
      7.58 a    sum = 28.26 a means "round" max
    f means "flashy" max
    
    5) 2003-009B:
     Timings: 50.01 33.40 52.99
    
    6) 1999-028C:
     Timings: 74.92 64.86
    
    7) 1996-049A:
     Trains of flashes separated by about 2 seconds
     without flashes. (Like amplitude modulation).
     Number of flashes within one train: 3, 4 or 5 (most)
     with the brightest flash in the middle.
     Timimgs were at start of every new train:
     3.44 4.37 5.47 5.07 4.98 9.29(2) 22.80(5)
    
    8) 1997-030F:
     Flash Period based on intervals between bright flashes.
     Timings:
     Start with +1 flash
     1.99 5.69 7.76 1.21 2.72 2.61 5.04 7.88 bright flash, sum = 34.90
     3.85 2.40 5.12 12.29 6.93 magn. +0 flash reddish, sum = 30.59
     14.66 4.64 2.78 5.04 bright flash, sum = 27.12
    
    9) 1996-037A:
     I suspect a photometric period of about 34 seconds.
     Missed possibly one submaximum at end to get a second full period.
     See the similarity in intervals:
     4.93 7.39 5.12 5.93 4.88 6.03 sum = 34.28
     4.71 7.11 5.69 6.32 5.02 ?    sum = 28.85
    
    10) 2003-009B:
     Very difficult to determine the maximum brightness with such long
     lasting maxima. My stopwatch showed:
     26.49 65.81 but it might be
     37    55        because of the uncertainty described above.
    11) 1966-089A:
     Only two periods followed by hand helding 15 x 80 binocs,
     difficult to keep it stable.
     Timings and appearances:
     F +5 12.82 a 36.64 a 19.46 sum = 68.92
     F +5 14.38 a 34.87 a 20.07 sum = 69.32
     F +5
     F means (relatively) bright flash
     a means (relatively) faint round maximum
    Site 4160: 51.27931 N, 5.47683 E (WGS84), 35 m
    Bram Dorreman
    
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