ETS-6 observations

Willie Koorts (wpk@saao.ac.za)
Mon, 3 Aug 1998 09:44:12 +0200 (GMT+0200)

Hi

Thanks to Tony for spoiling me by sending me predictions for ETS-6 and after 
I modified my PIP program for giving me fractional seconds on my old laptop
I did some observing of ETS-6 on Thursday evening.

The output below is direct from my PIP program with comments and measurements 
edited in afterwards.  Sometimes flash measurements are missing (eg. equating 
to 32.8 secs rather than 16.2 secs between measurements) - this is where I 
missed a flash for various reasons eg. setting tel. focus, not concentrating, 
etc.  Towards the end I had trouble with the satellite going behind tree-tops.

I started observing late after getting back from a meeting.  When the satelite
was first aquired, it was already flashing. 

   Time (UT)               Duration          Comments
   ~~~~~~~~~               ~~~~~~~~          ~~~~~~~~
19h 33m 18.00s  Date =   30- 7-1998
19h 33m 34.09s  diff =  0h  0m 16.09s
19h 33m 50.27s  diff =  0h  0m 16.18s
19h 34m  6.60s  diff =  0h  0m 16.33s
19h 34m 22.64s  diff =  0h  0m 16.04s
19h 34m 39.00s  diff =  0h  0m 16.36s
19h 34m 55.09s  diff =  0h  0m 16.09s
19h 35m 11.27s  diff =  0h  0m 16.18s
19h 35m 27.27s  diff =  0h  0m 16.00s
19h 35m 43.73s  diff =  0h  0m 16.46s
19h 36m 16.60s  diff =  0h  0m 32.87s
19h 36m 32.50s  diff =  0h  0m 15.90s
19h 36m 48.45s  diff =  0h  0m 15.95s
19h 37m  4.82s  diff =  0h  0m 16.37s
19h 37m 21.00s  diff =  0h  0m 16.18s
19h 37m 37.09s  diff =  0h  0m 16.09s
19h 37m 53.27s  diff =  0h  0m 16.18s
19h 38m  9.45s  diff =  0h  0m 16.18s
19h 38m 42.00s  diff =  0h  0m 32.55s
19h 38m 58.09s  diff =  0h  0m 16.09s
19h 39m 14.36s  diff =  0h  0m 16.27s
19h 39m 30.45s  diff =  0h  0m 16.09s
19h 39m 46.73s  diff =  0h  0m 16.28s
19h 40m  3.00s  diff =  0h  0m 16.27s
19h 40m 19.10s  diff =  0h  0m 16.10s
19h 40m 35.27s  diff =  0h  0m 16.17s
19h 40m 51.73s  diff =  0h  0m 16.46s
19h 41m  7.73s  diff =  0h  0m 16.00s
19h 41m 40.10s  diff =  0h  0m 32.37s
19h 41m 56.36s  diff =  0h  0m 16.26s
19h 42m 12.55s  diff =  0h  0m 16.19s
19h 42m 28.73s  diff =  0h  0m 16.18s
19h 42m 45.00s  diff =  0h  0m 16.27s
19h 43m  1.14s  diff =  0h  0m 16.14s
19h 43m 17.40s  diff =  0h  0m 16.26s
19h 43m 33.55s  diff =  0h  0m 16.15s
19h 44m  6.27s  diff =  0h  0m 32.72s
19h 44m 22.09s  diff =  0h  0m 15.82s
19h 44m 54.70s  diff =  0h  0m 32.61s
19h 45m 11.00s  diff =  0h  0m 16.30s
19h 45m 27.00s  diff =  0h  0m 16.00s
19h 45m 43.10s  diff =  0h  0m 16.10s
19h 45m 59.27s  diff =  0h  0m 16.17s
19h 46m 15.55s  diff =  0h  0m 16.28s
19h 46m 31.90s  diff =  0h  0m 16.35s
19h 46m 48.00s  diff =  0h  0m 16.10s
19h 47m  4.09s  diff =  0h  0m 16.09s
19h 47m 20.36s  diff =  0h  0m 16.27s
19h 47m 36.55s  diff =  0h  0m 16.19s
19h 47m 52.00s  diff =  0h  0m 15.45s
19h 48m  9.00s  diff =  0h  0m 17.00s
19h 48m 25.18s  diff =  0h  0m 16.18s
19h 48m 41.40s  diff =  0h  0m 16.22s - 57 flashes in 923.4sec = 16.20sec/flash

19h 52m 28.30s  diff =  0h  3m 46.90s (= 14 flash periodes)
19h 52m 44.80s  diff =  0h  0m 16.50s
19h 53m  0.40s  diff =  0h  0m 15.60s
19h 53m 16.90s  diff =  0h  0m 16.50s
19h 53m 33.00s  diff =  0h  0m 16.10s
19h 53m 49.09s  diff =  0h  0m 16.09s
19h 54m  5.27s  diff =  0h  0m 16.18s
19h 54m 21.64s  diff =  0h  0m 16.37s
19h 54m 37.73s  diff =  0h  0m 16.09s
19h 54m 54.00s  diff =  0h  0m 16.27s
19h 55m 10.20s  diff =  0h  0m 16.20s
19h 55m 26.45s  diff =  0h  0m 16.25s
19h 55m 42.60s  diff =  0h  0m 16.15s
19h 55m 58.82s  diff =  0h  0m 16.22s
19h 56m 15.00s  diff =  0h  0m 16.18s
19h 56m 31.20s  diff =  0h  0m 16.20s
19h 56m 47.50s  diff =  0h  0m 16.30s
19h 57m  3.83s  diff =  0h  0m 16.33s
19h 57m 19.80s  diff =  0h  0m 15.97s
19h 57m 36.00s  diff =  0h  0m 16.20s
19h 57m 52.20s  diff =  0h  0m 16.20s
19h 58m  8.36s  diff =  0h  0m 16.16s - 21 flashes in 340.04sec = 16.19sec/flash

20h  9m 12.90s  diff =  0h 11m  4.54s ( = 41 flash periodes)
20h 10m  1.57s  diff =  0h  0m 48.67s
20h 10m 17.55s  diff =  0h  0m 15.98s
20h 11m  6.20s  diff =  0h  0m 48.65s
20h 11m 22.18s  diff =  0h  0m 15.98s
20h 11m 38.50s  diff =  0h  0m 16.32s
20h 11m 54.64s  diff =  0h  0m 16.14s
20h 12m 10.82s  diff =  0h  0m 16.18s
20h 12m 27.45s  diff =  0h  0m 16.63s
20h 12m 43.20s  diff =  0h  0m 15.75s
20h 12m 59.40s  diff =  0h  0m 16.20s
20h 13m 15.90s  diff =  0h  0m 16.50s
20h 13m 31.82s  diff =  0h  0m 15.92s
20h 13m 48.00s  diff =  0h  0m 16.18s
20h 14m  4.17s  diff =  0h  0m 16.17s
20h 14m 20.36s  diff =  0h  0m 16.19s
20h 14m 36.70s  diff =  0h  0m 16.34s
20h 14m 52.90s  diff =  0h  0m 16.20s
20h 15m  9.00s  diff =  0h  0m 16.10s
20h 15m 25.27s  diff =  0h  0m 16.27s
20h 15m 41.50s  diff =  0h  0m 16.23s
20h 15m 57.70s  diff =  0h  0m 16.20s
20h 16m 30.00s  diff =  0h  0m 32.30s
20h 16m 46.20s  diff =  0h  0m 16.20s
20h 17m  2.67s  diff =  0h  0m 16.47s
20h 17m 18.64s  diff =  0h  0m 15.97s
20h 17m 51.00s  diff =  0h  0m 32.36s
20h 18m  7.09s  diff =  0h  0m 16.09s
20h 18m 23.50s  diff =  0h  0m 16.41s
20h 18m 39.80s  diff =  0h  0m 16.30s
20h 18m 55.73s  diff =  0h  0m 15.93s
20h 19m 12.10s  diff =  0h  0m 16.37s
20h 19m 28.30s  diff =  0h  0m 16.20s
20h 19m 44.36s  diff =  0h  0m 16.06s
20h 20m  0.30s  diff =  0h  0m 15.94s
20h 20m 16.90s  diff =  0h  0m 16.60s
20h 20m 49.30s  diff =  0h  0m 32.40s
20h 21m  5.45s  diff =  0h  0m 16.15s
20h 21m 21.64s  diff =  0h  0m 16.19s
20h 21m 54.00s  diff =  0h  0m 32.36s
20h 22m 10.18s  diff =  0h  0m 16.18s
20h 22m 26.50s  diff =  0h  0m 16.32s
20h 22m 42.90s  diff =  0h  0m 16.40s - 50 flashes in 810.00sec = 16.20sec/flash

When starting the session below, secondary flashes were noticed for the first time.
At this stage the fainter secondary flash was ~12sec into the (~16sec) flash period
(ie.  bright........12sec.........dim...4sec...bright)  

20h 35m 56.36s  diff =  0h 13m 13.46s ( = 50 flash periodes)
20h 36m  8.55s  diff =  0h  0m 12.19s
20h 36m 12.55s  diff =  0h  0m  4.00s
20h 36m 27.00s  diff =  0h  0m 12.45s
20h 36m 29.00s  diff =  0h  0m  4.00s
20h 36m 41.00s  diff =  0h  0m 12.00s
20h 36m 45.10s  diff =  0h  0m  4.10s
20h 36m 57.18s  diff =  0h  0m 12.08s
20h 37m  1.29s  diff =  0h  0m  4.11s
20h 37m 13.40s  diff =  0h  0m 12.11s
20h 37m 17.36s  diff =  0h  0m  3.96s
20h 37m 29.55s  diff =  0h  0m 12.19s
20h 37m 45.80s  diff =  0h  0m 16.25s
20h 37m 49.90s  diff =  0h  0m  4.10s
20h 38m  2.11s  diff =  0h  0m 12.21s
20h 38m  6.00s  diff =  0h  0m  3.89s
20h 38m 18.00s  diff =  0h  0m 12.00s
20h 38m 22.18s  diff =  0h  0m  4.18s
20h 38m 34.40s  diff =  0h  0m 12.22s
20h 38m 38.27s  diff =  0h  0m  3.87s
20h 38m 50.70s  diff =  0h  0m 12.43s
20h 38m 54.64s  diff =  0h  0m  3.94s
20h 39m  6.82s  diff =  0h  0m 12.18s
20h 39m 10.90s  diff =  0h  0m  4.08s
20h 39m 23.00s  diff =  0h  0m 12.10s
20h 39m 27.00s  diff =  0h  0m  4.00s
20h 39m 39.20s  diff =  0h  0m 12.20s
20h 39m 43.18s  diff =  0h  0m  3.98s
20h 39m 55.50s  diff =  0h  0m 12.32s
20h 39m 59.36s  diff =  0h  0m  3.86s
20h 40m 11.64s  diff =  0h  0m 12.28s
20h 40m 15.55s  diff =  0h  0m  3.91s
20h 40m 27.90s  diff =  0h  0m 12.35s
20h 40m 31.90s  diff =  0h  0m  4.00s - 17 flashes in 275.54sec = 16.21sec/flash
20h 40m 44.00s  diff =  0h  0m 12.10s

20h 41m  4.18s  diff =  0h  0m 20.18s
20h 41m 16.40s  diff =  0h  0m 12.22s
20h 41m 20.36s  diff =  0h  0m  3.96s
20h 41m 32.55s  diff =  0h  0m 12.19s
20h 41m 36.64s  diff =  0h  0m  4.09s
20h 41m 48.90s  diff =  0h  0m 12.26s
20h 41m 52.73s  diff =  0h  0m  3.83s
20h 42m  5.00s  diff =  0h  0m 12.27s
20h 42m  9.00s  diff =  0h  0m  4.00s
20h 42m 21.09s  diff =  0h  0m 12.09s
20h 42m 25.09s  diff =  0h  0m  4.00s
20h 42m 37.40s  diff =  0h  0m 12.31s
20h 42m 41.36s  diff =  0h  0m  3.96s
20h 42m 53.55s  diff =  0h  0m 12.19s
20h 42m 57.50s  diff =  0h  0m  3.95s
20h 43m  9.90s  diff =  0h  0m 12.40s
20h 43m 13.82s  diff =  0h  0m  3.92s
20h 43m 26.00s  diff =  0h  0m 12.18s
20h 43m 30.00s  diff =  0h  0m  4.00s
20h 43m 42.00s  diff =  0h  0m 12.00s
20h 43m 46.18s  diff =  0h  0m  4.18s
20h 43m 58.30s  diff =  0h  0m 12.12s
20h 44m  2.56s  diff =  0h  0m  4.26s
20h 44m 14.60s  diff =  0h  0m 12.04s
20h 44m 18.64s  diff =  0h  0m  4.04s
20h 44m 30.73s  diff =  0h  0m 12.09s
20h 44m 35.00s  diff =  0h  0m  4.27s
20h 44m 47.00s  diff =  0h  0m 12.00s
20h 44m 51.00s  diff =  0h  0m  4.00s
20h 45m  3.30s  diff =  0h  0m 12.30s
20h 45m  7.18s  diff =  0h  0m  3.88s
20h 45m 19.27s  diff =  0h  0m 12.09s
20h 45m 23.50s  diff =  0h  0m  4.23s
20h 45m 35.60s  diff =  0h  0m 12.10s
20h 45m 39.60s  diff =  0h  0m  4.00s
20h 45m 51.80s  diff =  0h  0m 12.20s
20h 45m 55.90s  diff =  0h  0m  4.10s
20h 46m  8.00s  diff =  0h  0m 12.10s
20h 46m 12.00s  diff =  0h  0m  4.00s
20h 46m 24.20s  diff =  0h  0m 12.20s
20h 46m 28.09s  diff =  0h  0m  3.89s
20h 46m 40.27s  diff =  0h  0m 12.18s
20h 46m 44.36s  diff =  0h  0m  4.09s
20h 46m 56.45s  diff =  0h  0m 12.09s
20h 47m  0.27s  diff =  0h  0m  3.82s
20h 47m 12.90s  diff =  0h  0m 12.63s
20h 47m 16.80s  diff =  0h  0m  3.90s
20h 47m 29.00s  diff =  0h  0m 12.20s
20h 47m 33.00s  diff =  0h  0m  4.00s
20h 47m 45.10s  diff =  0h  0m 12.10s
20h 47m 49.09s  diff =  0h  0m  3.99s
20h 48m  1.43s  diff =  0h  0m 12.34s
20h 48m  5.42s  diff =  0h  0m  3.99s - 26 flashes in 421.24sec = 16.20sec/flash

During the session below the flash behaviour changed from initially having 
the fainter secondary flash ~12sec into the (~16sec) flash period as before
(ie.  bright........12sec.........dim...4sec...bright)  
to being reversed towards the end of the session
(ie.  bright...4sec...dim........12sec.........bright) 

21h  0m 30.73s  diff =  0h 12m 25.31s  ( = 46 flash periodes)
21h  0m 42.73s  diff =  0h  0m 12.00s
21h  0m 46.82s  diff =  0h  0m  4.09s
21h  0m 58.91s  diff =  0h  0m 12.09s
21h  1m 15.10s  diff =  0h  0m 16.19s
21h  1m 19.09s  diff =  0h  0m  3.99s
21h  1m 31.30s  diff =  0h  0m 12.21s
21h  1m 35.82s  diff =  0h  0m  4.52s
21h  1m 47.45s  diff =  0h  0m 11.63s
21h  1m 51.60s  diff =  0h  0m  4.15s
21h  2m  3.90s  diff =  0h  0m 12.30s
21h  2m  7.73s  diff =  0h  0m  3.83s
21h  2m 24.00s  diff =  0h  0m 16.27s
21h  2m 36.00s  diff =  0h  0m 12.00s
21h  2m 40.27s  diff =  0h  0m  4.27s
21h  2m 52.18s  diff =  0h  0m 11.91s
21h  2m 56.27s  diff =  0h  0m  4.09s
21h  3m  7.00s  diff =  0h  0m 12.23s
21h  3m 12.70s  diff =  0h  0m  4.20s
21h  3m 24.82s  diff =  0h  0m 12.12s
21h  3m 29.00s  diff =  0h  0m  4.18s
21h  3m 40.90s  diff =  0h  0m 11.90s
21h  3m 45.09s  diff =  0h  0m  4.19s
21h  3m 57.10s  diff =  0h  0m 12.01s
21h  4m  1.43s  diff =  0h  0m  4.33s
21h  4m 13.36s  diff =  0h  0m 11.93s
21h  4m 17.45s  diff =  0h  0m  4.09s
21h  4m 29.55s  diff =  0h  0m 12.10s
21h  4m 33.73s  diff =  0h  0m  4.18s
21h  4m 45.80s  diff =  0h  0m 12.07s
21h  4m 50.00s  diff =  0h  0m  4.20s
21h  5m  2.00s  diff =  0h  0m 12.00s
21h  5m 18.10s  diff =  0h  0m 16.10s
21h  5m 34.30s  diff =  0h  0m 16.20s
21h  5m 50.70s  diff =  0h  0m 16.40s
21h  6m 23.00s  diff =  0h  0m 32.30s
21h  6m 39.10s  diff =  0h  0m 16.10s
21h  6m 55.18s  diff =  0h  0m 16.08s
21h  7m 11.45s  diff =  0h  0m 16.27s
21h  7m 27.64s  diff =  0h  0m 16.19s
21h  7m 32.00s  diff =  0h  0m  4.36s
21h  7m 44.00s  diff =  0h  0m 12.00s
21h  7m 48.00s  diff =  0h  0m  4.00s
21h  8m  4.27s  diff =  0h  0m 16.27s
21h  8m 16.30s  diff =  0h  0m 12.03s
21h  8m 20.45s  diff =  0h  0m  4.15s
21h  8m 32.55s  diff =  0h  0m 12.10s
21h  8m 36.73s  diff =  0h  0m  4.18s - 30 flashes in 486.00sec = 16.20sec/flash
21h  8m 48.73s  diff =  0h  0m 12.00s

At this stage the flash pattern was fully reversed
(ie.  bright...4sec...dim........12sec.........bright)

21h  9m 53.45s  diff =  0h  1m  4.72s ( = 4 flash periodes)
21h  9m 57.73s  diff =  0h  0m  4.28s
21h 10m 25.82s  diff =  0h  0m 28.09s
21h 10m 42.00s  diff =  0h  0m 16.18s
21h 10m 46.09s  diff =  0h  0m  4.09s
21h 10m 58.18s  diff =  0h  0m 12.09s
21h 11m 14.45s  diff =  0h  0m 16.27s
21h 11m 30.73s  diff =  0h  0m 16.28s
21h 12m  3.09s  diff =  0h  0m 32.36s
21h 12m  7.27s  diff =  0h  0m  4.18s
21h 12m 19.40s  diff =  0h  0m 12.13s
21h 12m 23.45s  diff =  0h  0m  4.05s
21h 12m 35.50s  diff =  0h  0m 12.05s
21h 12m 39.64s  diff =  0h  0m  4.14s
21h 12m 51.90s  diff =  0h  0m 12.26s
21h 12m 55.82s  diff =  0h  0m  3.92s
21h 13m  7.90s  diff =  0h  0m 12.08s
21h 13m 12.00s  diff =  0h  0m  4.10s
21h 13m 24.09s  diff =  0h  0m 12.09s
21h 13m 27.73s  diff =  0h  0m  3.64s
21h 13m 40.18s  diff =  0h  0m 12.45s
21h 13m 44.36s  diff =  0h  0m  4.18s
21h 13m 56.36s  diff =  0h  0m 12.00s
21h 14m  0.71s  diff =  0h  0m  4.35s
21h 14m 13.73s  diff =  0h  0m 12.02s
21h 14m 16.30s  diff =  0h  0m  3.57s
21h 14m 45.00s  diff =  0h  0m 28.70s
21h 15m  1.25s  diff =  0h  0m 16.25s
21h 15m  5.36s  diff =  0h  0m  4.11s
21h 15m 17.40s  diff =  0h  0m 12.04s
21h 15m 21.55s  diff =  0h  0m  4.15s
21h 15m 33.70s  diff =  0h  0m 12.15s
21h 15m 37.82s  diff =  0h  0m  4.12s
21h 16m  6.00s  diff =  0h  0m 28.18s
21h 16m 22.20s  diff =  0h  0m 16.20s
21h 16m 26.30s  diff =  0h  0m  4.10s
21h 16m 38.36s  diff =  0h  0m 12.06s
21h 16m 42.60s  diff =  0h  0m  4.24s
21h 16m 54.55s  diff =  0h  0m 11.95s
21h 16m 58.73s  diff =  0h  0m  4.18s
21h 17m 10.90s  diff =  0h  0m 12.17s
21h 17m 27.00s  diff =  0h  0m 16.10s
21h 17m 31.00s  diff =  0h  0m  4.00s
21h 17m 43.20s  diff =  0h  0m 12.20s
21h 17m 47.27s  diff =  0h  0m  4.07s
21h 17m 59.50s  diff =  0h  0m 12.23s
21h 18m  3.55s  diff =  0h  0m  4.05s
21h 18m 15.64s  diff =  0h  0m 12.09s
21h 18m 20.00s  diff =  0h  0m  4.36s
21h 18m 31.82s  diff =  0h  0m 11.82s
21h 18m 48.00s  diff =  0h  0m 16.18s
21h 18m 52.09s  diff =  0h  0m  4.09s
21h 19m  4.27s  diff =  0h  0m 12.18s
21h 19m  7.55s  diff =  0h  0m  3.28s
21h 19m 20.45s  diff =  0h  0m 12.90s
21h 19m 24.55s  diff =  0h  0m  4.10s
21h 19m 36.70s  diff =  0h  0m 12.15s
21h 19m 40.90s  diff =  0h  0m  4.20s
21h 19m 52.73s  diff =  0h  0m 11.83s
21h 20m  9.00s  diff =  0h  0m 16.27s
21h 20m 13.10s  diff =  0h  0m  4.10s
21h 20m 25.18s  diff =  0h  0m 12.08s - 39 flashes in 631.63sec = 16.196sec/flash

At the start of the session below, no secondary flashes were initially seen,
but (probably as I got better dark adapted) they were noticed to still be
present (but quite faint) in the "reversed" form as above (4 sec into flash
period). Towards the end, tree-tops were getting into the FOV making it more
difficult to see all flashes. 

21h 31m 13.20s  diff =  0h 10m 44.75s 
21h 31m 29.45s  diff =  0h  0m 16.25s
21h 31m 45.70s  diff =  0h  0m 16.25s
21h 32m  2.00s  diff =  0h  0m 16.30s
21h 32m 17.91s  diff =  0h  0m 15.91s
21h 32m 34.27s  diff =  0h  0m 16.36s
21h 32m 50.40s  diff =  0h  0m 16.13s
21h 33m  6.55s  diff =  0h  0m 16.15s
21h 33m 22.82s  diff =  0h  0m 16.27s
21h 33m 39.00s  diff =  0h  0m 16.18s
21h 33m 55.10s  diff =  0h  0m 16.10s
21h 34m 11.27s  diff =  0h  0m 16.17s
21h 34m 27.60s  diff =  0h  0m 16.33s
21h 34m 43.73s  diff =  0h  0m 16.13s
21h 34m 48.00s  diff =  0h  0m  4.27s
21h 35m  4.09s  diff =  0h  0m 16.09s
21h 35m 16.09s  diff =  0h  0m 12.00s
21h 35m 20.40s  diff =  0h  0m  4.31s
21h 35m 32.27s  diff =  0h  0m 11.87s
21h 35m 36.55s  diff =  0h  0m  4.28s
21h 35m 48.60s  diff =  0h  0m 12.05s
21h 35m 52.36s  diff =  0h  0m  3.76s
21h 36m  4.91s  diff =  0h  0m 12.55s
21h 36m  8.64s  diff =  0h  0m  3.73s
21h 36m 25.36s  diff =  0h  0m 16.72s
21h 36m 37.20s  diff =  0h  0m 11.84s
21h 36m 41.36s  diff =  0h  0m  4.16s
21h 36m 53.36s  diff =  0h  0m 12.00s
21h 37m  9.55s  diff =  0h  0m 16.19s
21h 37m 13.73s  diff =  0h  0m  4.18s
21h 37m 25.80s  diff =  0h  0m 12.07s
21h 37m 42.00s  diff =  0h  0m 16.20s
21h 37m 46.20s  diff =  0h  0m  4.20s
21h 37m 58.10s  diff =  0h  0m 11.90s
21h 38m  2.33s  diff =  0h  0m  4.23s
21h 38m 14.30s  diff =  0h  0m 11.97s
21h 38m 18.60s  diff =  0h  0m  4.30s
21h 38m 30.55s  diff =  0h  0m 11.95s
21h 38m 34.73s  diff =  0h  0m  4.18s
21h 38m 46.80s  diff =  0h  0m 12.07s
21h 38m 50.91s  diff =  0h  0m  4.11s
21h 39m  3.00s  diff =  0h  0m 12.09s
21h 39m 19.09s  diff =  0h  0m 16.09s
21h 39m 23.27s  diff =  0h  0m  4.18s
21h 39m 35.30s  diff =  0h  0m 12.03s
21h 39m 39.50s  diff =  0h  0m  4.20s
21h 39m 51.60s  diff =  0h  0m 12.10s
21h 39m 55.80s  diff =  0h  0m  4.20s
21h 40m  7.64s  diff =  0h  0m 11.84s
21h 40m 24.00s  diff =  0h  0m 16.36s
21h 40m 28.00s  diff =  0h  0m  4.00s
21h 40m 40.18s  diff =  0h  0m 12.18s
21h 40m 44.27s  diff =  0h  0m  4.09s
21h 40m 56.45s  diff =  0h  0m 12.18s
21h 41m 12.45s  diff =  0h  0m 16.00s
21h 41m 16.55s  diff =  0h  0m  4.10s
21h 41m 28.80s  diff =  0h  0m 12.25s
21h 41m 32.91s  diff =  0h  0m  4.11s
21h 41m 45.00s  diff =  0h  0m 12.09s
21h 41m 49.00s  diff =  0h  0m  4.00s
21h 42m  1.14s  diff =  0h  0m 12.14s
21h 42m  5.20s  diff =  0h  0m  4.06s
21h 42m 17.40s  diff =  0h  0m 12.20s - 41 flashes in 664.20sec = 16.20sec/flash

At this stage the secondary flashes were getting very faint in my 80mm scope.

At the start of the session below no more secondary flashes were noticed and 
the tree-tops were making it increasingly difficult to follow.

21h 52m 33.09s  diff =  0h 10m 15.69s ( = 38 flash periodes)
21h 53m 21.60s  diff =  0h  0m 48.51s
21h 53m 37.80s  diff =  0h  0m 16.20s
21h 53m 54.00s  diff =  0h  0m 16.20s
21h 54m 10.09s  diff =  0h  0m 16.09s
21h 54m 26.20s  diff =  0h  0m 16.11s
21h 54m 42.36s  diff =  0h  0m 16.16s
21h 54m 58.64s  diff =  0h  0m 16.28s
21h 55m 15.00s  diff =  0h  0m 16.36s
21h 55m 31.00s  diff =  0h  0m 16.00s
21h 55m 47.18s  diff =  0h  0m 16.18s
21h 56m  3.55s  diff =  0h  0m 16.37s
21h 56m 19.70s  diff =  0h  0m 16.15s
21h 56m 35.64s  diff =  0h  0m 15.94s
21h 56m 52.00s  diff =  0h  0m 16.36s - 16 flashes in 258.91sec = 16.182sec/flash

22h  2m 16.00s  diff =  0h  5m 24.00s ( = 20 flash periodes)
22h  2m 32.40s  diff =  0h  0m 16.40s
22h  2m 48.55s  diff =  0h  0m 16.15s
22h  3m  4.67s  diff =  0h  0m 16.12s
22h  3m 53.60s  diff =  0h  0m 48.93s
22h  4m  9.50s  diff =  0h  0m 15.90s
22h  4m 25.73s  diff =  0h  0m 16.23s - 8 flashes in 129.73sec = 16.216sec/flash

ETS-6 still flashing but setting behind trees.

Regards
Willie
                        Willie Koorts   wpk@saao.ac.za   

       Cape Town,  Observatory   33d 56' 03"S   18d 28' 36"E   GMT + 2h
       Wellington, South Africa  33d 38' 56"S   19d 00' 52"E   GMT + 2h

       For - Amateur Astronomy - Telescope Making - Satellite Tracking -
                   Visit  ....   http://www.saao.ac.za/~wpk/

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