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Thanks, Timo. As I said, 'xephem' lists the beginning of astronomical (18o
dip)
twilight at that site as 0632UT, while this was observed starting at
0612UT. So
it sounds like it could not have been an NLC, unless xephem is wrong. What
might it have been then?? Below is a more detailed description I just
sent to another responder, Tom McEwan. Any further comments appreciated!
-LG
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>Could you give us a little more information on this
Sure, Tom. I was observing from NW of Bath, ME, USA, 43o56'30"N
69o50'20"W,
elevation uncertain but between 20 and 50 m. The sky was translucent after
a
recent small cold front, with limiting magnitude 7.0+ above 40o alt.
Limiting
magnitude near the feature was perhaps 5.0 to 6.0 - no visible light
pollution,
and at a clear over-sea point on the horizon, but with only medium-poor
seeing.
The feature was first noticed at 0612UT, and was again observed at 0620UT
(again, I thought nothing of it at the time, unfortunately :<). At 0612,
it
showed a relatively narrow peak rising up perhaps 12 to 15o, covering
perhaps
10o of azimuth to the S and slightly less to the N. At 0620, two other
faint
peaks MAY have been observed near the N and S edges of the feature (again,
this
is from memory), and the central peak reached up about 15o. 0% cloudiness.
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