Ir38+39 videotaped
Bjoern Gimle (b_gimle@algonet.se)
Fri, 13 Feb 1998 20:13:35 +0100
This morning I videotaped, and watched, the following flares :
39 98- 2-13 6:48:00.0 057 30 1378 D Lit -5.1 F 1.41 1.4
39 98- 2-13 6:48:06.2 059 30 1372 D Lit -5.1 F 0.14 -6.7
39 98- 2-13 6:48:14.0 062 30 1366 D Lit -5.1 F 1.81 2.1
38 98- 2-13 6:49:40.0 057 30 1354 D Lit -4.9 F 1.38 1.3
38 98- 2-13 6:49:45.9 059 30 1348 D Lit -4.9 F 0.11 -6.8
38 98- 2-13 6:49:53.5 062 31 1342 D Lit -4.9 F 1.79 2.0
Times are UTC+1. Subjectively, the second flare was fainter.
I aimed my camcorder tripod using a compass and my carpenter's angle
to the light blue morning twilight, 60 degrees from the Sun at -5 deg.
I zoomed to about 10 degrees FOV initially, a little less at the end
of the first one, and during the second.
I timed them on playback to 15+14 seconds, so the mag.limit at this
zoom and backlight appears to be about 2.0. With dark skies, the limit
is around 4-5, partly because a longer focal length can be used, so
the effective lens area is larger.
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