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(meteorobs) IMO-NEWS: Perseid data August 10/11 LANMA


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Date: Mon, 11 Aug 1997 14:24:44 +0200
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From: Casper ter Kuile <pegasoft@cc.ruudot nl>
Subject: Perseid data August 10/11 LANMA
Cc: PVMILNWK@boxdot nl, 100114.1361@compuserve.com
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night report August 10/11 1997, Marco Langbroek


Morning,

Below my data from last night. At first, it looked grim. We arrived at
Biddinghuizen with a clear sky, but during early twilight a cover of
altocumulus moved in from the south. Since it seemed 'endless' and one of
our stations to the southeast reported it too, we feared that that would be
it for this night. Inbetween the small open spaces in the cover we saw nice
meteors, a.o. a mag. 0 Capricornid.

Around 22:10 UT it cleared and after a short period with hazy but open cast
sky, it quickly improved, and actually it would become very clear during
this night. High rates,  but many faint meteors at first. Brighter ones
came later that night, in seizable numbers up to -3 (of course, that one
occured while I took a sanitary stop - it always does). We must have
photographed several. Due to the clear sky, it seemed like maximum! After
the bad start, this was a very pleasant surprise and we really enjoyed the
fine show the Perseids put on last night for us. I ended up with 455
meteors in 3.81 h effective!

So it seems that this is one of our best ever Perseid campaigns in terms of
numbers of bright nights. The newest forecasts are increasingly possitive
for tonight, with the thunderstorms either not yet near us or already
dissoluted. There is even a chance that 12/13 will be good too. At the
moment, the sky is bright blue with a strong breeze. So we are very
positive here.

- -Marco (DMS, the Netherlands)

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- -----------------------------------------------------------------

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

Date: August 10/11, 1997

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

22:20 - 23:04	0.67	6.4	39	9	1	3	0	15
23:04 - 00:25	1.17	6.6*	76	16	4	6	2	37
00:25 - 01:26	0.93	6.8	57	12	1	3	1	40
01:26 - 02:11	0.72	6.7	67	8	1	4	0	25
02:11 - 02:30	0.32	6.0	15	1	3	1	0	8

TOTAL		3.81	<6.7>	254	46	10	17	3	125	455
- ----------------------------------------------------------------------------
- ----------------------------------------------------

*Note: During the interval 23:04 - 00:25 UT I probably underestimated the
Lm given the high numbers of meteors. The sky was quickly brightening and
somewhat variable at that time, with scattering Lm counts.


- ----------------------------------------------------------------------------
- ----------------------------------------------------
Stream		-2	-1	0	1	2	3	4	5	6

Sporadics	0	0	1	0	12	30	60	20	3
Perseids		1	3	4	6	17	50	94	58	20
d Aquarids	0	0	0	0	1	12	26	7	1
i Aquarids	0	0	0	0	0	2	7	0	1
k Cygnids	0	0	1	1	0	3	10	2	0
Capricornids	0	0	0	0	0	1	2	0	0
- ----------------------------------------------------------------------------
- ----------------------------------------------------


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

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