(meteorobs) Question about radiant drift

Marco Langbroek marco.langbroek at wanadoo.nl
Fri Jun 4 15:26:17 EDT 2004


I think a good rule of thumb would be, one degree parallel to the ecliptic
for each degree in solar longitude?

- Marco




> Well, we've waited a couple of days and no one has jumped forward to help
> with this question.  I think that most of us are a bit unsure of the
theory
> of radiant drift and that is why there is a hesitation to help.  In other
> words, most of us are incapable of answering the question properly.
>
> I'll take a stab at it.  It seems to me that radiant drift would be unique
> to each shower because  of the shower's orbital inclination, whether the
> meteor stream approached the Earth from behind or the front of Earth's
path
> in space, and the unique orbit that each meteor stream has.  I don't see
how
> a simple formula would be able to handle these features, but I'm waiting
for
> someone to tell me how they would. :-)
>
> After all, back in the '20s, Denning still thought that some radiants were
> stationary even in the face of C. P. Olivier's theoretical challenges.
Why
> did he feel so strongly that there was no movement at all?  Perhaps we
need
> a refresher on the theoretical underpinnings of radiant drift.  Anyone
> capable of helping us out?
>
>   Pete Bias
>
>
>
> -----Original Message-----
> From: meteorobs-bounces at meteorobs.org
> [mailto:meteorobs-bounces at meteorobs.org]On Behalf Of Bamm Gabriana
> Sent: Wednesday, June 02, 2004 6:07 AM
> To: meteorobs at meteorobs.org
> Subject: (meteorobs) Question about radiant drift
>
>
> 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.
>
> --- meteorobs-request at meteorobs.org wrote:
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> > than "Re: Contents of meteorobs digest..."
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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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