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(meteorobs) Leo data LANMA 17-18 Nov 2001
Hi folks,
Hereby (table below), my visual Leonid data of the 7 revolutions peak over
the US. I observed from Arizona, where the Dutch Meteor Society (with
participation of American observers at mt. Lemon) set up a multistation
video network (stations at Safford and Benson with the Mt. Lemon group
joining in) for orbital determinations. Our locality was a nice spot in the
desert 20 miles east of Safford. The howling Coyotes this night were rivaled
by howling observers: because, this was (as many of you have seen for
themselves) a great show! Although the ZHR was "only" half the 1999 storm
value, I found this 2001 Leonid show more attractive than the 1999 storm
(which I observed from Spain) due to the brighter meteors and long peak
duration.
A few notes with below data:
- data from early in the night are given in longer intervals;
- from 9:16 UTC onwards in 5 minute intervals;
- from 9:37 UTC onwards in 1 minute intervals.
The latter are exact 60 second intervals. The given times represent the
START of each count interval, and represent EXACT times of xx:yy:00 (e.g.,
9:51 12 means that these 12 Leonids were counted in the 60 seconds
between 9:51:00 and 9:52:00, accurate to better than a second, watch
synchronized with GPS time signal at the start of the night).
In the early part of the session we had cirrus & haze fields which lowered
Lm. But around 10h UTC, about an hour before the actual peak moment, the sky
cleared completely and limiting magnitudes went up to very fine values.
Below, for the cirrus influenced period, I only reported time intervals
where Lm was constant and I had a complete field of view. Partly clouded
periods or periods with rapid Lm variations have been omitted.
Chris: perhaps it is good for your purpose to know that I have a Cp of 1.4,
which means I see rates 1.4 times as high as the 'modus' Cp 1.0 observer.
Best wishes,
Marco Langbroek
Obs: Marco Langbroek LANMA
Date: 17-18 Nov 2001
Loc.: Black Hills nr. Safford, Arizona, USA
32d 51'.758 N, 109d 24'.418 W
from-to (UTC) Teff Lm Nleo Ntau
07:33-08:10 0,62 6,3 24 0
08:20-08:34 0,23 6,4 18 1
(start of 5 minute counts)
09:16-09:21 0,083 6,1 21 0
09:21-09:26 0,083 6,3 10 0
09:26-09:31 0,083 6,4 18 0
(start of 1 minute (= 60 seconds) counts at xx:yy:00 UTC exactly)
start Nleo Lm remarks
09:37 6 6,4 Cirrus period
09:38 8 6,4
09:40 7 6,4
09:41 8 6,4
09:42 5 6,4
09:43 9 6,4
09:44 9 6,4
09:45 6 6,0 bad period sky conditions
09:46 2 5,8
09:49 9 5,8
09:50 3 6,0
09:51 12 6,4 improving sky conditions
09:52 11 6,4
09:53 4 6,4
09:54 9 6,4
09:55 7 6,4
09:57 8 6,4
09:59 10 6,4
10:00 8 6,4
start fully clear skies!
10:06 22 6,8
10:07 16 6,8
10:08 17 6,8
10:09 16 6,8
10:10 22 6,8
10:11 11 6,8
10:13 16 6,7
10:14 21 6,7
10:15 28 6,7
10:16 9 6,7
10:17 30 6,7
10:18 23 6,7
10:19 18 6,7
10:20 29 6,7
10:23 29 6,7
10:24 22 6,7
10:25 20 6,7
10:26 17 6,7
10:27 24 6,7
10:28 43 6,7
10:29 26 6,7
10:30 23 6,7
tape jammed: data inbetween lost
10:40 38 6,7
10:41 30 6,7
10:42 30 6,7
10:43 29 6,7
10:44 30 6,7
10:45 21 6,7
10:46 35 6,7
10:47 24 6,7
10:48 19 6,7
10:50 32 6,7
10:51 44 6,7
10:52 25 6,7
10:53 29 6,7
11:01 24 6,8
11:02 31 6,8
11:03 29 6,8
11:04 17 6,8
11:05 36 6,8
11:08 32 6,8
11:09 29 6,8
11:10 19 6,8
11:11 30 6,8
11:12 18 6,8
11:13 26 6,8
11:17 17 6,8
11:18 27 6,8
film change
11:33 16 6,8
11:34 11 6,8
11:35 9 6,8
11:36 14 6,8
11:37 19 6,8
11:42 13 6,7
11:43 12 6,7
11:44 13 6,7
11:45 7 6,7
11:46 16 6,7
11:47 19 6,7
11:48 13 6,7
11:49 11 6,7
11:52 4 6,7
11:53 4 6,7
11:57 15 6,7
11:58 6 6,7
11:59 8 6,7
12:00 7 6,7
12:24 13 6,4
12:25 11 6,4
12:26 16 6,4
12:27 10 6,4
12:28 4 6,4
12:29 6 6,4
12:30 17 6,4
12:31 3 6,4
12:33 13 6,4
12:34 5 6,4
12:35 9 6,4
12:36 11 6,4
12:37 5 6,4
12:38 7 6,4
12:39 3 6,4
12:40 3 6,3
12:41 7 6,3
12:43 13 6,2
12:44 2 6,2
12:45 4 6,2
end (12:46 UTC)
magnitude distributions, split in periods, LEONIDS ONLY
period (UTC) -3 -2 -1 0 +1 +2 +3 +4 +5 +6
pre-max:
07:33-08:34 0 1 4 4 6 8 9 7 2 1
09:16-10:01 0 4 12 4 15 38 39 38 28 19
post-max:
11:59-12:46 2 0 1 8 7 36 60 37 18 9
note: no magnitude data for high activity hour centered on peak. Fireballs
up to -5 magnitude during this period.
---
Marco Langbroek private: marco.langbroek@wanadoodot nl
Leiden University work: m.langbroek@arch.leidenunivdot nl
Faculty of Archaeology
P.O. Box 9515
http://home.wanadoodot nl/marco.langbroek/
NL-2300 RA Leiden
The Netherlands
"What seest thou else
In the dark backward and abysm of time?"
William Shakespeare: The Tempest act I scene 2
---
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