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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