(meteorobs) Daytime telescopic video meteor work possibility?

[Thomas Ashcraft]

Hi Ed, Chris, all,

Thank you for your input.

What I am thinking about is the possibility of daytime telescopic 
observing without any special filtering and using the basic camera 
settings to attain contrast.  I was surprised to be able to image 
Jupiter in a bright sky amidst a dark background merely by adjusting the 
DMK 41 camera gamma/exposure settings.  Hence, I was thinking that there 
might be a possibility of doing some sort of daylight Arietid telescopic 
work, aiming directly towards the radiant.

For what it is worth, I made a short video clip of Jupiter in daylight 
in order to show the sky background. I think there is enough contrast 
enhancement for meteors to show up with an unfiltered camera. I would 
not attempt to do full sky work, rather perhaps just Arietid or zeta 
Perseid radiant monitoring to see if a few meteors might be captured.

.mp4  1.7 MB  :  http://www.heliotown.com/Jupe_Daylight_Ashcraft.mp4

Thomas




Ed Majden wrote:
> 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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