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(meteorobs) Small meteor outburst on June 15/16 1996
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To: betlem@strw.leidenunivdot nl, m.cdot delignie@research.kpndot com, peter@max.arc.nasadot gov, delpsurf@cistrondot nl, jvtleven@interdot nldot net, pvmilnwk@boxdot nl, breukers@pidot net, mcavanvliet@pasti.stm.tudelftdot nl, mottink@interdot nldot net, caroos@pidot net, C.F.Johannink@home.cnt.antennadot nl, rjbouma@pidot net, bettonvl@fys.ruudot nl, neyts@worldaccessdot nl, poerinku@worldaccessdot nl, p.m.koenraad@phys.tuedot nl, gloudema@strw.leidenunivdot nl, m.a.brentjens@fys.ruudot nl, j.hartman@hsbosdot nl, hhendrik@worldaccessdot nl, kuiper@knmidot nl, severin@knmidot nl, meteors@cnt.antennadot nl, hercunet@cucidot nl, lanzing@edte.utwentedot nl, G.J.S.Cladder@sgz.utwentedot nl, astro@groep.edith.antennadot nl, a.w.ploegmakers@cet.hendot nl, pruppers_heuvelsland@pidot net, eddy@cis.HZeelanddot nl, imo-news@tu-chemnitzdot de, meteorobs@latradedot com, zenit@astro.rugdot nl, mathlenr@fys.ruudot nl
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Subject: (meteorobs) Small meteor outburst on June 15/16 1996
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From: Casper ter Kuile <pegasoft@cc.ruudot nl>
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Date: Sun, 16 Jun 1996 23:35:51 +0200
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Reply-To: meteorobs@latradedot com
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Sender: owner-meteorobs
DMS circular
(issued by Marco Langbroek, Dutch Meteor Society)
Small meteor outburst on June 15/16 1996
>DMS observer Marco Langbroek (Voorschoten, the Netherlands,
>52 deg. 10' N, 4 deg. 30' E) observed a small meteor outburst during
>the night of June 15/16 1996. Between 22:40 UT and 0:50 UT, 38 meteors
>were observed during 1.9 effective observing hours with Lm ~6.1. 25 of
>these were sporadics: but in addition, 13 very characteristic meteors
>dispersed from a radiant located at RA 18h 40m, dec. +55 (1950.0), near
>xi Draco.
>These 'xi Draconids' had a very characteristic velocity on the edge of
>medium to fast, comparable to the velocity of Lyrid meteors (~50 km/s).
>The two brightest meteors (magnitude 0 and -1) had a yellowish colour.
>All meteors have been plotted on a gnomonic chart. The number of observed
>sporadics is comparable with the numbers observed by Langbroek in June and
>July 1995. [1]
>
>The observations show a typical outburst peak profile for the xi Draconids.
>Peak rates occured around 23:30 UT, with a modest peak ZHR near 15-20
>according to some VERY PRELIMINARY calculations, which have been carried out
>assuming a population index r of 2.5 and using 20 minute intervals.
>
>We are very eager to now if someone can CONFIRM the event by either visual
>or radio observations.
>
>
>UT Lm Teff Ndra Nspo ZHR Dra
>
>22:40-23:00 6.1 0.33 2 5 8 +- 5
>23:00-23:20 6.1 0.33 2 5 7 +- 5
>23:20-23:40 6.1 0.33 4 3 15+- 7
>23:40-00:10 6.1 0.45 3 7 8 +- 5
>00:10-00:30 6.0 0.33 1 5 4 +- 3
>00:30-00:50 6.0 0.33 1 1 4 +- 3
>
>Magnitude distribution:
>
> -1 0 1 2 3 4 5 TOT
>Dra 1 1 0 3 5 2 1 13
>Spo 0 0 1 4 10 7 3 25
>
>
>During observations, sky conditions were generally good though not excellent.
>Ocassionally some drifting small cirrus streaks passed by.
>There was a continuous twilight: medio June the sun doesn't reach -18 degrees
>altitude for latitudes of the Netherlands and a constant Nautical twilight
>persists between 22:10 and 1:15 UT.
>
>[1] Radiant, Journal of the Dutch Meteor Society vol. 17 nr. 4 (1995) pp. 72-73
>
>Marco Langbroek
>Hans Betlem
>(Dutch Meteor Society, the Netherlands)
>e-mail betlem@strw.leidenunivdot nl
Latest info on the DMS web-pages:
>>>>> http://www.pidot net/~terkuile/meteors/dms.htm <<<<<
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