TLE
04APR2015 was visible from first contact until part way through early
partial phase egress with brightening morning twilight and the moon
"hitting the trees" (shortly after the pictures above were
taken). Sky conditions were less than spectacular with haze and
thin clouds - but could have been a lot worse.
The
image sequence below (top left to bottom right), with a cadence of five
minutes
between exposures, is from 1st contact until the setting moon "hit the
trees" at 05:33 MST. These images were
acquired with a Questar 3-1/2 inch telescope (f/14 back focus) and
Nikon D3000 camera. The sky was hazy with a lot of schmutz
and
wafting thin clouds brightening the sky, lowering the image contrast,
obscuring coloration (and in general being very annoying).
Exposure times (nd ISO sensitivity) was empirically adjusted throughout
the eclipse to compensate (as best possible) for varying sky conditions
after 04:06 MST (see exposure log below image mosaic). Click HERE
to see an illustration of the timing and geometry of this
eclipse. Compare
(with pristine conditions) to TLE 14MAY2014 observed and photographed
from the same location under perfect skies a year earlier.
Click the image below to see
at 2x size and resolution.
(Then click on THAT image if it does not appear bigger in your browser
when loaded_.
EXPOSURE LOG (HH:MM
as Mountain Standard Time) of Image Mosaic
HH:MM ISO EXPTIME HH:MM
ISO EXPTIME HH:MM
ISO EXPTIME HH:MM
ISO EXPTIME
03:16
400 1/100s 03:21 400
1/100s 03:26 400 1/100s
03:31 400 1/100s
03:36 400
1/100s 03:41 400
1/100s 03:46 400
1/100s 03:51 400 1/100s
03:56 400
1/100s 04:01 400
1/100s 04:06 400
1/100s 04:11 400 1/50s
04:16
400 1/25s 04:21
400 1/25s
04:26
400 1/25s 04:31
400 1/15s
04:36
400 1/6s 04:41
400 1/4s
04:46
400 1/2s 04:51
400 1s
04:56
400 2s 05:01
400 4s
05:06
800 4s 05:11 1600 4s
06:16 1600 8s
05:21 1600 8s
05:26 1600 8s
05:31 400 4s {twilight brightening}
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