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(meteorobs) Re: June Lyrids
Sirko,
Many thanks for your work in providing these positions.
I agree that all 3 meteors are good candidates for the June Lyrid
shower.
A photograph by Robert Haas indicates a possible Xi Draconid radiant of
18:32 +54 on June 21. Visual plots indicate a the possible radiant lies
a bit further east at 18:45 +54.
It would be interesting to see if any of your mid June activity caught
on video indicates a radiant in this vicinity.
Thanks Again!
Bob
Sirko Molau wrote:
> Here are, as promised, the data for the three June Lyrids:
>
> 17.06.99:
> =========
> 23:46:01 Meteor #6 at (0.67,1.00)->(0.60,0.85) frames=10 dur=0.62s pixel=7
> dir=246deg vel=9.9deg/s sigma=2.3
> shower=JLY bright=1.0mag raddist=1.4deg exp vel=6.6deg/s
> (19.892h,46.76deg) -> (20.408h,49.73deg) acc=4.7'
>
> This meteor was quite fast for a JLY (9.9 deg/s, 6.6 deg/s expected for a
> JLY) but the backward prolongation missed the radiant center only by 1.4
> degree. The accuracy of the trail is very good, since the meteor appeared
> on 10 video frames.
>
> 19.06.99:
> =========
> 22:16:58 Meteor #6 at (0.56,0.52)->(0.50,0.45) frames=4 dur=0.42s pixel=6
> dir=232deg vel=9.1deg/s sigma=1.4
> shower=JLY bright=0.8mag raddist=0.5deg exp vel=6.4deg/s
> (20.302h,49.45deg) -> (20.643h,51.03deg) acc=1.0'
>
> This meteor is again a little too fast (9.1 instead of 6.4 deg/s), but
> fits even better to the JLY radiant.
>
> 00:03:51 Meteor #11 at (0.82,0.64)->(0.81,0.60) frames=3 dur=0.22s pixel=3
> dir=264deg vel=7.0deg/s sigma=1.2
> shower=JLY bright=1.2mag raddist=2.2deg exp vel=8.6deg/s
> (21.418h,38.71deg) -> (21.537h,38.60deg) acc=1.3'
>
> The final meteor has only a short trail, so it's path is not that good
> defined. This time the velocity fits better and the backward prolongation
> missed the JLY radiant by two deg.
>
> I will not send the three pictures to the list, as they are 50 kB in size.
> If you want to have a look at them, just drop me a mail.
>
> Again, I did not check for Xi Draconids. Which radiant position (+drift,
> geocentric velocity, etc.) is expected for this shower?
>
> Best wishes, Sirko
>
> --
> **************************************************************************
> * Dipl.-Inform. Sirko Molau * *
> * RWTH Aachen, Lehrstuhl fuer Informatik VI * __ *
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> * * *
> * phone: +49-241-8021615 * Shakespeare *
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> **************************************************************************
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>
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