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(meteorobs) Perseid data Aug 11/12 LANMA: harvest time!

night report Marco Langbroek, the Netherlands, August 11/12 1997


Hello everybody!

Just woke up at 4 pm local time after a long and deep sleep. Below my data
from last night. This was a great night! It was the clearest sky so far
during our campaign, the sky was extremely dark and limiting magnitudes
rose to +6.9 after moonset and stayed there the whole of the night. One of
the finest nights I ever experienced during any Perseid campaign! Given the
fine share of clear nights last 1.5 weeks, it looks like southern Europe
has come to the Netherlands. This is our best Perseid campaign in the 17 yr
history of DMS, concerning number of clear nights and general observing
conditions.

Meteors were harvested by numbers. The big kick of such extremely high Lm's
is that the numbers of meteors become enourmous -the massive increase is in
the faint ones that become visible with such Lm's. So, this resulted in a
rich crop: 588 meteors in 4.98h effective, of which 387 were Perseids. Many
faint ones due to the high Lm, but also some nice fireballs, especially
later in the night.

Nice meteors appeared at (a.o., and time in UT) :

21:27:10    -1 Per    21:39:15    -2 Per    23:04:20    -1 Per
23:17:18    -1 Per    23:44:00    -2 Per    23:51:12    -1 Per
00:27:26    -1 Per    00:37:27    -1 Spo    00:54:02    -1 Per
00:54:20    -3 Per    01:08:25    -5 Per     01:09:02    -4 Per
01: 56:40   -1 Per    01:59:05    -1 Per     02:12:47    -1 Per
02:29:35    -5 Per

...in addition, many magnitude zero's were seen.

There is some cirrus in the sky now. A dissolving small front passed over
this afternoon, a second one will arrive this night probably but will be
largely dissolved (or so we hope). The thundersorms have dissappeared:
dissolved into the weak fronts with some cirrus now passing by.

-Marco Langbroek

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Observer: Marco Langbroek (LANMA    -    MLV)
Location: Biddinghuizen, the Netherlands, 52d 29' N, 5d 41' E

Date: August 11/12, 1997

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UT		Teff	Lm	Per	d Aqr	i Aqr	k Cyg	Cap	Spo

21:10 - 22:00	0.78	6.4	37	1	1	2	0	13
22:00 - 23:02	1.02	6.9	56	8	0	3	1	30
23:02 - 00:09	1.00	6.9	85	9	2	7	2	33
00:09 - 01:09	0.80	6.9	78	5	3	6	1	32
01:09 - 02:09	0.95	6.9	99	5	1	2	1	23
02:09 - 02:35	0.43	6.0	32	4	0	2	0	4

TOTAL		4.98	<6.9>	387	32	7	22	5	135	588
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Stream	-5	-4	-3	-2	-1	0	1	2	3	4	5	6

Spo	0	0	0	0	1	1	4	5	46	54	22	2
Per	2	1	1	2	9	15	22	34	110	104	56	34
d Aqr	0	0	0	0	0	0	1	1	12	9	7	2
i Aqr	0	0	0	0	0	0	0	0	3	4	0	0
k Cyg	0	0	0	0	0	0	0	1	6	11	4	0
Cap	0	0	0	0	0	0	0	0	1	4	0	0
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Leonids-'98? A once (twice?) in your lifetime appearance! You can't afford
to miss it!

Casper ter Kuile, Akker 145, NL-3732 XD, De Bilt, The Netherlands
Phone: +31-30-2203170;  Fax: +31-30-2202695;  GSM: +31-6-54723974
E-mail1: pegasoft@cc.ruudot nl;  E-mail2: casper.ter.kuile@rivmdot nl
WWW: http://www.pidot net/~terkuile/meteors/dms.htm