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Re: (meteorobs) Re: Some Perseid photos
Hello Jim, Bob, Kevin, Gary, and George,
and Hello to ALL,
I'd like to introduce myself. My name is Bob Verish. I just subscribed
to meteorobs a few days ago, and I thought I would lurk for a while
before putting my toe in the water, but with all these interesting
threads, and now these images by Robin Casady that Kevin shared with us,
I can no longer hold back.
First, what an awesome image of a Perseid meteor transitioning into an
object in "dark flight"! Right on the heels of Gary's and Wayne's
explanation of a "bolide" we get visual evidence of fragmentation of a
fireball and a twisting/spiraling remnant in dark flight, reminiscent of
those Pasamonte bolide photos. Although the fragmentation doesn't look
that "explosive", and even if it occurred too high in the atmosphere to
generate enough sound, I bet that a dark flight body of that size would
eventually cause a sonic boom audible to observers that were close
enough. I agree with what Jim said about transverse forces.
I see that while I was composing this message, Ron has posted a
decidedly different opinion about this image that I find so special. I
guess it can't be helped, but I've probably gone and offended somebody
on my very first (introduction) message. One small toe into the water
for this man, one giant cannonball into the pool of public opinions.`
While I'm on that subject, I just want to say that I am sensitive to
those of you who are offended by the word, "bolide" (and by its usage,
too;-). Its usage must bother you, like the phrase "meteorites
travelling through the atmosphere" bothers me. But for now, if you
would accept me as "a geologist with a keen interest in meteorites and
HOW THEY GOT HERE", in time you may understand my need to use the "b"
word.
Wishing I had subscribed much sooner,
I say Good Night Skies to all,
and Good Night Mr. George Zay, where ever you are. . .
Bob Verish
--- James Wray <star@foothilldot net> wrote:
> Hi Bob an All
>
> Just to keep things going here, I am kind of
> thinking that if the waviness
> effect in the meteor image was due to atmosphere,
> then the stars would have
> to share in the same or greater degree of turbulent
> motion. This effect is
> certainly there in general, and is the actual cause
> of astronomical
> "seeing", or fuzzing out of star images. Usually
> astronomical seeing image
> displacements are less than say a few arc seconds,
> which at the scale of
> the meteor image would appear to be much less than
> the waves in the meteor
> trace. I'm still inclined to put the motion in the
> meteor trajectory
> itself. I think there was a visual multiple witness
> fireball/meteorite
> over Poland (was it Pultusk?? someone might set me
> straght on this-) many
> years ago that was observed to make a 180 degree
> change in direction along
> its entry trajctory. I think transverse forces can
> act on meteorids in
> some instances, and this may be an interesting
> example. Just wanting to
> keep the possibility open there. :)
>
> All Best Wishes
>
> Jim Wray
>
> -----------------------------
>
>
>
> At 11:37 AM 8/20/99 -0700, you wrote:
> >Kevin,
> >
> >That faint continuation is probably real. It
> appears that a fragment
> >survived the terminal burst and that is what you
> see as the faint line.
> >
> >As for the waviness, this was probably caused by a
> turbulent atmosphere.
> >
> >Interesting picture. Thanks for bringing it to our
> attention!
> >
> >Bob
> >
> >
> >KevTK@aol.com wrote:
> >>
> >> HI All,
> >>
> >> In the meteor folder of AOL's astronomy BBS there
> is this guy who is
> showing
> >> his Perseid photos. I thought I would let you all
> in on the links so
> everyone
> >> could see. When you see the first one can someone
> tell me if thats a camera
> >> artifact near the head of the meteor? The message
> below was written 8/16.
> >> Kevin K
> >> ~~~~~~~~~~~~~~~~~~~~~~~
> >> Here are some quick scans of a couple shots taken
> Thursday night. I haven't
> >> had time to correct the color properly, but I
> thought you might find the
> >> images interesting.
> >>
> >> <A
> >>
>
HREF="http://wwwdot carmelcoast.com/media/Robin/Astro/Perseids6.jpg">http://www.c
> >>
> armelcoast.com/media/Robin/Astro/Perseids6.jpg</A>
> >>
> >> <A
> >>
>
HREF="http://wwwdot carmelcoast.com/media/Robin/Astro/Perseids6detail.jpg">http:/
> >>
> /wwwdot carmelcoast.com/media/Robin/Astro/Perseids6detail.jpg</A>
> >>
> >> <A
> >>
>
HREF="http://wwwdot carmelcoast.com/media/Robin/Astro/Perseids50mm1.4.jpg">http:/
> >>
> /wwwdot carmelcoast.com/media/Robin/Astro/Perseids50mm1.4.jpg</A>
> >>
> >> They were taken from the observing deck of MIRA's
> Oliver Observatory on
> Chews
> >> Ridge. I was experimenting with documenting light
> pollution while a friend
> >> was shooting some calibration shots with the 36".
> >> ~~~~~~~~~~~~
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