(meteorobs) Question about radiant drift

Wed Jun 2 06:06:30 EDT 2004

I just want to ask, is there a way to "compute" the
radiant drift of a meteor shower? What I mean is, is
there a formula that can be used to predict where a
radiant would be at a given time? From what I've read
it seems the radiants move along curves of
approximately constant ecliptic latitudes. So I may
just need to know the change in ecliptic longitude and
convert the results to RA and Dec. Thanks for any
explanations in advance.

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> Today's Topics:
> 
>    1. FW: Cometary meteorites! (Ed Majden)
>    2. Re: Re: 2004 June Bootids
> (musabajo02 at foxinternet.com)
>    3. Re: Re: 2004 June Bootids (Pierre Martin)
>    4. Re: Re: 2004 June Bootids (Pierre Martin)
>    5. Re: 2004 June Bootids (Sergey Shanov)
>    6. Re: Re: 2004 June Bootids (Robert McNaught)
>    7. RE: Perseid outburst prediction this year?
> (Lyytinen Esko)
>    8. RE: 2004 June Bootids (Jeremie VAUBAILLON)
>    9. Re: Re: 2004 June Bootids (Skywayinc at aol.com)
>   10. Re: 2004 June Bootids (Paul Jones)
> 
> 
>
----------------------------------------------------------------------
> 
> Message: 1
> Date: Mon, 31 May 2004 10:37:02 -0700
> From: Ed Majden <epmajden at shaw.ca>
> Subject: (meteorobs) FW: Cometary meteorites!
> To: meteorobs at meteorobs.org
> Message-ID: <BCE0BB4E.A07F%epmajden at shaw.ca>
> Content-Type: text/plain; charset=US-ASCII
> 
> 
> ----------
> From: Ed Majden <epmajden at shaw.ca>
> Date: Mon, 31 May 2004 10:10:12 -0700
> To: METEOROBS <meteorobs at atmob.org>
> Subject: Cometary meteorites!
> 
>  I also found the discussion interesting.  One thing
> that I find troublesome
> is the general high velocity of Comets near the
> earth.  Are there any short
> period comets with low velocities?  The Geminids are
> thought to be of
> asteroidal origin but I have seen some discussion
> that this may be a comet
> core instead of an asteroid.  The Geminid meteoroids
> seem to be more solid
> objects rather than the more friable  cometary
> types. Of course there is
> also Tunguska! Tagish Lake seems to be in a league
> of its own.  By the way,
> more than a few grams of Tagish Lake was recovered. 
> Unfortunately much of
> it ended up on the lake bottom after the thaw.  I
> have a tiny sample of
> Tagish in my small collection of meteorites.
> Cheers:
> Ed
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Mon, 31 May 2004 11:19:31 -0700
> From: musabajo02 at foxinternet.com
> Subject: Re: (meteorobs) Re: 2004 June Bootids
> To: Global Meteor Observing Forum
> <meteorobs at meteorobs.org>
> Message-ID:
>
<0F89BC54-B32F-11D8-8720-000393707E1E at foxinternet.com>
> Content-Type: text/plain; charset=US-ASCII;
> format=flowed
> 
> roo,
> 
> thought you'd enjoy interpreting russian here. . .
> 
> xoxoxo
> 
> On Friday, May 28, 2004, at 12:28 PM, Sergey Shanov
> wrote:
> 
> > Hello Huan,
> >
> > Including in a resonance trails June Bootid are
> similar snake. The 
> > majority
> > by this the snakes (with a major value delta_a) is
> located inside an 
> > orbit
> > of the Earth. Probably, too far to meet with the
> Earth long before 23 
> > June.
> > Thus, fragments, farther from a comet, have the
> greater value delta_a. 
> > It
> > noticeably even by reviewing the large-scale
> table. All this valid, if 
> > old
> > meteoroids have not begun chaotic driving.
> > Sergey
> >
> >
> >>> Less probable maximas (with a major value
> delta_a) tend to be before
> > June
> >> 23
> >>> (up to several day). However, these fragments
> trails transit far from
> > the
> >>> Earth.
> >>
> >> Do you mean the absolute value of delta_a of the
> cross section on 
> >> June 23
> > is
> >> very large?
> >> Later parts of dust trail are corresponding to
> smaller delta_a?
> >>
> >> Clear skies,
> >> Huan
> >
> >
> >
> >
> > _______________________________________________
> > Mailing list meteorobs
> > meteorobs at meteorobs.org
> >
>
http://lists.meteorobs.org/mailman/listinfo/meteorobs
> >
> 
> 
> ------------------------------
> 
> Message: 3
> Date: Mon, 31 May 2004 18:29:43 -0400
> From: Pierre Martin <dob14.5 at sympatico.ca>
> Subject: Re: (meteorobs) Re: 2004 June Bootids
> To: Global Meteor Observing Forum
> <meteorobs at meteorobs.org>
> Message-ID:
> <03ADF903-B352-11D8-971F-003065B96B00 at sympatico.ca>
> Content-Type: text/plain; charset=US-ASCII;
> format=flowed
> 
> Thank you Joe.  I did read with much interest your
> article for 2004 
> June Bootids in Sky & Tel.
> 
> However, it appears that your article was written
> before the latest 
> particle simulations results by Jeremie Vaubaillon
> and Sergey Shanov.
> 
>  From their simulation results, it now appears that
> July 23 will at 
> least present a more elevated *posibility* of some
> enhanced June 
> Bootids (i.e. "the snake can bite the Earth").  From
> this, am I correct 
> to assume that the Earth will be located much closer
> near the resonant 
> cloud than it was for any other year since 1998?
> 
> As for 1992 and 1986, could it be possible that any
> minor June Bootid 
> activity went completely unoticed, especially due to
> the short North 
> hemisphere nights?  Or possibly because of a lack of
> anyone recording 
> or plotting activity on these dates?
> 
> Thanks and clear skies!
> 
> - Pierre
> 
> 
> 
> 
> 
> 
> 
> On May 30, 2004, at 8:11 PM, Skywayinc at aol.com
> wrote:
> 
=== message truncated ===

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