Photometric Obs. BD in April 2009

From: Bram Dorreman (bram.dorreman@gmail.com)
Date: Wed May 06 2009 - 17:12:12 UTC

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    yy-nnncc yy-mm-dd hh:mm:ss.s ooo sss.s s.s nnn ff.fff comments
    65- 65 C 09-04-21 22:33:47.2 BD   74.9 0.2   4 18.7   Irr; +4.8->inv; 5)
    65- 65 C 09-04-22 21:07:40.2 BD  148.2 0.3   8 18.5   Irr; +4.0->inv; 8)
    73-107 B 09-04-22 20:57:02.5 BD   37.2 0.2  12  3.10  A; +5.0->inv
    85- 79 B 09-04-23 00:19:08.8 BD  110.8 0.3  10 11.1   A; +4.3->7.1
    85- 94 G 09-04-22 23:46:12.0 BD  101.4 0.4   6 16.9   A; +6.3->inv
    85- 94 G 09-04-21 22:52:47.3 BD   83.3 0.4   5 16.7   A; +6.1->inv; 6)
    90- 17 B 09-04-20 20:41:23.3 BD   58.4 0.3   6  9.7   A’f’; +6.0->inv; 3)
    90- 17 B 09-04-20 22:26:01.0 BD  144.1 0.2  15  9.6   A ssm; +5.3->inv
    90- 17 B 09-04-28 20:46:03.4 BD  106.8 0.1  11  9.7   A’a; +4.8->inv
    92- 52 A 09-04-20 22:50:33.7 BD   65.3 0.3   3 21.8   Irr; +2.5->inv; 4)
    92- 73 B 09-04-23 01:28:43.1 BD  132.4 0.4   4 33.1   A; +4.8->inv; ssm
    93- 50 A 09-04-22 22:43:03.8 BD   85.5 0.2   4 21.4   +3.0->inv; 9)
    93- 50 A 09-04-28 21:31:42.3 BD   84.6 0.2   4 21.1   +3.5->inv; 9)
    93- 50 A 09-04-28 21:31:58.4 BD  111.2 0.2  42  2.65  A; +3.5->inv; 9)
    96- 37 A 09-04-20 20:54:54:1 BD   89.1 0.3  10  8.9   F; +1.0->6.5
    97- 77 B 09-04-22 21:51:22.2 BD   35.9 1.5   2 18.0   A
    99- 28 C 09-04-28 22:55:38.0 BD  205.2 4     3 68.4   A; +6.5->8.0; 13)
    02- 54 C 09-04-22 19:43:00.8 BD   77.6 0.2   9  8.6   A; +4.5->inv
    03- 49 A 09-03-31 19:47:07.3 BD   50.4 0.3   2 25.2   F; +4.8->inv; 2)
    05- 48 C 09-04-22 21:26:37.5 BD  107.9 0.2   8 13.5   A; +5.8->inv
    05- 48 C 09-04-28 20:58:02.7 BD  273.3 0.2  20 13.67  A ssm; +5.8->inv
    07-  6 A 09-03-30 21:28:09.5 BD   44.5 0.2   3 14.8   F’a’a’; +1.0->inv; 1)
    07- 11 B 09-04-20 21:27:14.6 BD  113.8 2.0   1 114    A; +4.8->7.5; 10)
    07- 11 B 09-04-22 23:26:36.3 BD  137.0 2.0   2 68.5   A; +5.8->8.0; 10)
    07- 11 B 09-04-28 22:21:56.6 BD  214.7 2     2 107    A; +5.9->inv
    07- 12 M 09-04-22 19:52:01.8 BD   49.2 0.3   2 24.6   Irr; +5.->inv; 7)
    07- 29 B 09-04-28 21:56.04.4 BD  104.0 0.3   5 20.8   A’a; +2.5-inv; 12)
    08- 36 B 09-04-22 20:39:59.8 BD   68.8 0.2  37  1.86  A; +3.6->inv
    08- 36 B 09-04-28 21:18:45.4 BD   76.6 0.1  40  1.92  A
    09- 21 B 09-04-22 21:34:07.0 BD   75.7 0.3   7 10.8   A; +2.4->inv
    09- 21 B 09-04-24 20:59:28.5 BD   74.3 0.3   6 12.4   A; +1.5->6.0; 11)
    
    
    1) Timings and grouping with bright flash on 1st of each group:
       (7.11 5.41 2.34) (6.43 4.84 3.63) (6.47 4.54 3.70)
    2) Timings show a pattern as follows:
       (6.36 6.22 6.25 4.56 1.58) (6.54 6.55 6.29 4.54 1.53)
    3) A short flashy maximum was about halfway two round maxima:
       (5.68 5.04) (3.96 5.27) (4.44 5.84) (3.66 4.33)  (5.21 5.84 3.86 5.30)
    4) timings and maximum type:
       (F 6.04 a 4.47 F 10.84) (F 6.73 a 3.93 f 16.74 a) 22.28 a 21.63
       with F = bright flash,
            f = less bright flash,
            a = “round” maximum less bright.
       1st, 3rd and 4th group have about same length,
       2nd group is longer (phase shift?)
    5) Many short flashes, difficult to time. Following grouping and timing
       might be a possibility yielding about the same group interval times:
       (5.49 5.62 2.71 4.65)
       (5.46 3.37 3.09 1.86 1.62 3.44)
       (2.21 3.44 1.76 4.78 3.16 3.48)
       (5.42 2.69 4.04 2,77 3.80 5.68)
       Details about the satellite body and extensions might help to obtain
       a better interpretation.
    6) timings are 14.94 16.82 17.44 17.92 16.17 low in southwest.
    7) I am not sure about the correct identification. Did not find this
       object on following evenings.
       Maxtypes and timings:
       (f 5.65 f  7.18 f 11.56)
       (m 5.40 f  4.83 f 7.78 a  6.76 f)
       with f = flashy max,
            m = flat max and
            a = “round” max
    8) Based on long interval at end of series of flashes I determined
       following timings and groupings:
       (0.73 2.62 2.99 0.86 1.15 1.41 2.50 1.44 4.69)
       (3.48 3.01 1.34 0.74 1.24 2.48 1.52 1.52 3.29)
       (3.26 3.16 1.84 1.61 2.31 1.63 4.70)
       (3.11 3.30 0.81 0.87 1.61 2.57 1.57 1.45 3.21)
       (3.14 3.14 1.58 1.92 3.07 1.28 1.70 2.78)
       (2.95 3.37 1.29 2.03 2.40 2.03 4.37)
       (3.02 3.32 1.61 1.84 2.54 1.70 4.45)
       (2.93 3.71 1.11 2.29 2.26 1.88 1.62 2.81)
       All individual flash times are inaccurate due to the irregularity
       of their interval times.
    9) FR was the observation set of regular flash period intervals on
          April 28th, 2009.
       FI was the observation set of very irregular flash period intervals on
          April 22nd, 2009.
       FR yielded a short period of 2.65 seconds but I noticed an ondulation
       in the maximum brightnesses on every 8 periods. This long period was
       determined as well and was used to see whether the FI set yielded a
       similar long period by grouping short maxima intervals.
       I found such a period, but I am aware this way of working might be not
       correct. Any comment is welcome.
       The several types of  maxima (round, flashy or flat) did not help me much,
       nor did the pattern of the short, medium and long interval times.
       I did not even find a pattern in the individual maximum brightness values
       (magnitudes)
       Here follows the grouping and timings of the FI-set:
       (f4 3.14 f6 7.50 f7 2.96 f4 5.31 a6 2.49) sum = 21.40
       (a7 3.04 f3 5.75 a5 1.88 a7 3.07 f4 5.36 2.21) sum = 21.31
       (8.82 a6 1.93 f5 3.38 a6 5.40 a7 1.90)  sum = 21.43
       (f5 3.35 a7 5.11 a7 2.22 f5 3.35 a7 4.97 a7 2.35 f5) sum = 21.35
    10) I possibly missed one maximum at the April 20th-observation
    11) timings: 10.25 14.07 18.03 10.79 10.63 10.56
    12) timings:
        20.18 (15.69 5.60) (11.89 8.89) (10.82 9.89) (10.79 10.21)
        Notice the decreasing long interval time and the increasing short
        interval time.
    13) timings 60.93 69.68 74.57
    
    Other photometric observations
    yy-nnncc yy-mm-dd hh:mm:ss.s ooo sss.s s.s nnn ff.fff comments
    73-107 B 09-04-21 20:23      BD                       14)
    83- 69 H 09-04-20 20:29      BD                       +7.3 V; 15)
    91-  9 J 09-04-20 21:08:06   BD                       +5.5 S; 16)
    91- 76 E 09-04-23 00:40      BD                       +3.2 S; 17)
    96- 72 A 09-04-23 20:12:38   BD                       flare +0.5
    96- 72 A 09-04-28 19:44:22   BD                       flaring
    97- 82 B 09-04-23 01:15      BD                       +2.0 flash else +3.8
    03- 42 G 09-04-22 21:50      BD                       –0.5; 18)
    05- 42 A 09-04-23 20:20:04   BD                       flare +1.5; 19)
    07- 29 A 09-04-21 22:52      BD                       +3.0; 20)
    08- 39 B 09-04-23 01:11      BD                       +6.8; Briz t. d=4850 km
    08- 44 B 09-04-23 00:09      BD                       +5.8; Briz t. d=2750 km
    08- 64 A 09-04-20 21:42:32   BD                       max mag +1.5
    09- 16 C 09-04-20 20:34      BD                       +7.8; Briz t. d=4300 km
    
    14) two flashes, mag +1.0 and mag +1.4.
        Identification might be wrong.
        Object was seen while having a starparty.
    15) Unexpectedly bright for this tiny sat, kind of flare?
        In same FOV as 33331 2008-042A Geoeye 1
    16) Unexpectedly bright for this Kosmos-rocket wreck near sig Boo.
    17) While other triplet members were +5.5
    18) near the Tania’s (lam & Mu UMa) yellowish, flaring?
        Identified as 27945 Kaistsat 4
    19) 2nd flare at 20:20:08 +1.5
    20) in same FOV while following 1985-094G; kind of flaring? near psi Uma
    
    Site 4160: 51.27931 N, 5.47683 E (WGS84), 35 m
    Bram Dorreman
    
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