Ir20, Ir21, Rosat

Jim Nix (nixj@bellsouth.net)
Sun, 15 Nov 1998 15:52:27 -0600

Hi all,

 More flash data.  Ir 21 tum is a mess to figure out....


11/98 35.3163567N  89.8862610W  100m
16
97- 34 E 98-11-16 00:17:01.90  1.25 .02 01  1.25
97- 34 C 98-11-16 00:57:04.00 14.00 .02 14  1.0000 2.5-3.0
97- 34 C 98-11-16 00:59:30.63 07.15 .02 07  1.0214 2.0-2.5
90- 49 A 98-11-16 00:35:41.50 54.50 .02 03  18.1666 6.0-inv

-------------------------------------

Details of observations:

Ir 21 tum  97034E

StopWatch major flashes:
00:16:41.17
00:17:00.64, 01.90, 2.??, 20.51, 43.56

tape data  F-major flash, f-minor flash, i-invisible or minima
    c-constant, b-brightening, d-dimming

00:14:41i, 47b, 48i, 58-03i
00:15:03i, 04b-06b, 10i, 11F, 18b, 20-23i, 25f, 41-43i, 51i, 59b
00:16:01i, 8B, 12d, 17-20c, 22f, 22.5f, 41.17F, 50-54dimming, 55i, 58f,
59f
00:17:00.64F, 01.90F, 2.??F 15-17i, 18f, 20.51F, 22f, 25i, 30b, 39f,
40f, 43.56F, 45F, 57i
00:18:01i, 06f, 14d, 18i, 33f, 34f, 40f, 45i, 54f, 55f
00:19:03f
----------------------
Ir 20 tum 97034C
stopwatch flashes
00:59:23.48F, 24.57F, 25.62F, 26.76F, 27.68F, 28.63F, 29.78F, 30.63F,
              50.18F, 51.17F.

Analysis-
        23.48 to 30.63 = 7.15/8 = .89375 between flashes
  -and- 14/15 = .93333 between flashes
  -or-  1.02 and 1.00 using the period method.

tape data
00:56:00 acquired at 20d Elv rapid flashes mag 3,
00:56:50-00:57:04 (15 flashes/ 14secs)
00:58:25-:30 brighter flashes :31 - :40 dimming near zenith
00:59:23.48F to :30.63  (8 major flashes after zenith as noted above.)
00:59:50.18F, 51.17F
01:00:00 series of bright flashes at hour then dimming.
01:01:00 still rotating and flashing dimming vis to inv
 still flashing with inv between flashes
01:49:00 lost at el 25-30d almost due north probably into shadow
---------------------
Rosat (90049A)  00:34:04 acquired
At Iota CrB at 00:34:13.05 above less than 1d
brightest at:
00:34:47
00:35:01.65, 18.55, 41.50,  lost at 45"
Was extremely faint through 8x40's invisible most of the pass but
visible
enough to know that it was passing.

Jim