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RE: (meteorobs) Warning mistaken date for Delphinids


Hi all,

Koen Miskotte and I have targetted this stream over the past ten years. We do 
have the impression that the stream has a very low level annual activity from 
the radiant position listed by Jenniskens. The stream is less clear however 
than the eta Lyrids for example.

Marco Langbroek


Citeren Esko.Lyytinen@MINEDU.FI:

> 
> Hi,
> 
> We have submitted a new paper with Peter Jenniskens, to ICAURS on the
> oubursts related to long period comets. This is on the direct computing of
> the one revolution trails that are reponsible of the short outburtsts
> associated or suspected to be assocated to long period comets. This is
> expected to give a better means for these predictions than the earlier one
> (that was based on the location of the solar system barycentre). With the
> gamma Delphindis, the year 2003 (11 June at about 16.35 UT) looks much more
> promising than this year. The calculated miss distance RD-rE is about
> -0.0003 AU (assuming that an exact hit has happened at the (only onserved)
> outbuts in 1930. (In this year it is about -0.002 AU) The uncertainties in
> the observed rariant makes also this rD-rE value uncertain, (but less so
> than with many of the other outbursts suspected with a suspected connetion
> to some (unknown) long period comet).
> 
> If the outburst is actually not of of long period nature (up from a few
> hundred years), then the calculation of the trail does not correctly
> represent the true path. Then also the trail will be already 'ended' or
> empty from meteoroids producing visual meteors. Even in the lower longe
> period-range it may now be empty. In this case, however there is the
> possibility that it may produce some level telescopic (or video-) outburst.
> 
> 
> If you try to observe this year (well this advice may come too late for
> that), it would be of value if even a few were observed. Then the hopeful
> improvement of the radian location would be the really important thing, for
> future prdictions. Of course, if (two station) video (or phtographic)
> observations could confirm the long period nature of this outburts, this
> would be even more important. But as told no outburst is expected to this
> year, but this does not exclude the possibility of detecting a few of them.
> 
> Esko
> 
> >>>
> 
> I'm sorry but only today I saw that I wrote 
> a mistaken date for Delphinids, the exact
> date it's JUNE 11th, around 13.30 U.T.
> naturally who want to see this meteors must
> observe too before and after of this time.
> Clear skys.
> Roberto Gorelli
> 
> 
> 
> 
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> 



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