(meteorobs) Daytime telescopic video meteor work possibility?

[Ed Majden]

Thomas:
	I speculated on trying to record daytime meteors using a very narrow  
band Na 1 filter thinking it would make the background sky dark  
except for the Na 1 line where meteors have strong emissions!  The Na  
1 line is a Solar absorption line rather than emission line so it  
should not present a problem.  Good idea, except it does not work!   
The filter has too much leakage at other wavelengths so the sky is  
still to bright.  I was hoping it would work like a Ha-solar filter  
used to view prominences.  I have a Lumicom Solar prominence filter  
which uses a tuneable filter at the eyepiece end and a pre-filter  
used on the objective. If you look through either filter alone you  
can see through them, but when combined it isolates the Ha-line to a  
width of ~1-1/2 A.  Perhaps someone can figure out how to do the same  
with a Na 1 filter.  I speculate that it will probably not work as  
Na-1 meteor emissions are rather faint and the Solar Ha emissions are  
still very bright so you can see the prominences.  You need a filter  
that is opaque across the entire spectrum but clear for the Na 1  
meteor emission line.  Spec sheets indicate that narrow band filters  
will do this but they won't.  They still have leakage at other  
wavelengths darn it!

Ed Majden - Meteor Spectroscopy
Courtenay, B.C. Canada.


On 29-May-10, at 8:19 AM, Thomas Ashcraft wrote:

> The other day I was tracking Jupiter in the daylight sky with a 100 mm
> refractor, Celestron CG5-gt mount and a DMK 41 video camera.   I had
> Jupiter in sight on my pc screen with good contrast until I stopped at
> 10 am on a bright sunny morning.
>
> This makes me ponder the possibility of using this telescope system  
> for
> the daytime Arietids.  I am thinking of training the telescope on the
> Arietid radiant and seeing if it might capture some daytime streaks  
> with
> the DMK 41 at a high contrast or gamma setting.
>
> I am wondering if anyone does or has done daytime telescopic meteor
> observing?
>
> Are there any papers or articles of this daytime possibility or web
> links on this subject?
>
> Thank you in advance for any information on this subject.
>
> Clear skies,
> Thomas
>
>
> Thomas Ashcraft  |  New Mexico
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