(meteorobs) Re: [IMO-News] June Bootids - Call for observations

[Gunnar Glitscher]

Hallo Herr Arlt,

heute Nacht (23.6.04) beobachteten mein Kollege Erich Müller und ich
vom Südrand Darmstadts aus zwischen 1.30 und 2.30 MESZ den in
Richtung Bootiden-Radiant gelegenen Himmelsbereich (2/8 - 3/8 Ci,
Grenzgröße +4.8 mag). Es traten in diesem Zeitraum einige schnelle
bis mittelschnelle sporadische Meteore der Helligkeit +2 bis +4 mag
auf, auffallend langsame Objekte aus Richtung des Radianten konnten
nicht beobachtet werden. Gegen 2.30 MESZ zog der Himmel von Westen
her rasch zu.

Grüße aus Darmstadt,
Gunnar Glitscher
Arbeitsgemeinschaft Astronomie u. Weltraumtechnik Darmstadt e. V.     


RainerArlt schrieb am 22.06.2004:
>
>
>=================================
>    Call for observations
>=================================
>
>Numerical computations of the June Bootid meteoroid stream by
>several researchers has revealed heighetened chances to see a
>maximum of June Bootid activity this year as early as
>
>   2004 June 23, roughly 10h - 19h
>
>A global converage of June Bootid activity will be a most 
>helpful campaign in validating the numerical models. Obser-
>vations are required also for times not covered by the 
>predictions. It is unlikely though that a meteor storm will 
>occur. Enhanced meteor rates may mean that as few as 10 June 
>Bootids are appearing per hour.
>
>It is thus recommended to plot the meteors into gnomonic
>star maps and test for June Bootid membershift _after_ the
>observation. This method has proven to give more reliable
>results. 
>
>The entry velocity of the June Bootids is extremely slow:
>18 km/s (geocentric speed 14 km/s). June Bootids are very
>slow meteors. If the meteor looks slow, it is not a June
>Bootid. Only if it looks _unusually_ slow, it is one. Once
>you have seen a real one, you'll know what I try to convey
>here.
>
>Note that the apparent radiant is always shifted towards
>the zenith by a few degrees. This is because of the slow
>speed of the June Bootids. Take the true radiant at
>alpha ~ 223 deg (RA = 14h50), delta ~ +47 and shift it
>slightly towards the zenith. June Bootids should come from
>this point.
>
>Please send your observing reports in a style similar to
>
>     http://www.imo.net/visual/imoform.html
>
>to me at rarlt at aip.de, or to the meteorobs mailing list
>at meteorobs at meteorobs.org if you wish to share your expe-
>riences with others.
>
>Times below are rounded to 1/2 hours.
>
>
>Mikiya Sato:
>------------
>  Times between 12:30 and 19:30 UT are given depending on the
>  dust trail approaching the Earth.
>
>Sergey Shanov & Sergey Dubrowskiy:
>----------------------------------
>  Times of 09:30 - 13:00 UT are given for various encounters to
>  very small distances from the Earth. Other possibilities
>  are 14:00, 15:30, 18:00 UT.
>  
>
>Jeremie Vaubaillon:
>-------------------
>  A time centered on 11:00 UT is given.
>
>
>
>Clear skies,
>Rainer Arlt
>
>--
>Rainer Arlt  --  Astrophysikalisches Institut Potsdam -- www.aip.de
>Visual Commission - International Meteor Organization -- www.imo.net
>rarlt at aip.de --  phone: +49-331-7499-354  --  fax: +49-331-7499-526
>
>
>
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