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Re: (meteorobs) Re: Some Perseid photos
Hi All,
I completely agree with Robert.
It certainly is an interesting picture but surely not a meteor.
Nevertheless a beginning meteorphotographer could think so.
Members of the Dutch Meteor Society have taken many hunderds of
meteorphoto's and there is not a single one which is not straight.
Of course there are many strange pictures among them but one aspect they
all have in common: straight. But remind: on fish-eye lenses meteors are
curved like circles, but again not like this one which is irregular.
I presume this one is from an aircraft as Robert points out.
At 15:27 21-08-1999 +1000, you wrote:
>Having looked at the image
>
>http://wwwdot carmelcoast.com/media/Robin/Astro/Perseids6.jpg
>
>I'm pretty sure it is not a meteor but an aircraft.
>
>1) Without having done any astrometry, the path looks to pass some 5 or 10
>degrees below the Perseid radiant.
>
>2) It has a wavy path inconsistent with a meteor, but present in all the
>aircraft trails we record regularly here.
>
>3) Look beyond the bright "end" and there is clearly a fainter red trail
>significantly displaced from the overall path.
>
>The aircraft was probably going from right to left with the landing lights
>either switched on at the bright section, or directed towards the camera
>in a turn.
>
>Robert H. McNaught
>rmn@aaocbn.aaodot gov.au
>
>On Fri, 20 Aug 1999, James Wray 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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>> >
>> >
>>
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>>
>
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Casper ter Kuile, Dutch Meteor Society (DMS)
Akker 145, NL-3732 XD, De Bilt, The Netherlands
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