Re: [APML] Light pollution filters and Comet NEAT

[steve banbury <banburys@sonic.net>]

Hi Greg and Jeff:

The IDAS filter response is shown at:
http://www.sciencecenter.net/hutech/tokai/filtplt.htm

The only spectra I could find on the web for  C/2001 Q4 was at:
http://home.freeuk.com/m.gavin/encke.htm

I didn't try to to superimpose the 2 plots, but  I can see that some 
energy would be lost using the filter. It still seems like a coin flip 
as to whether the reduction of local light pollution would make this
loss acceptable.  I'm suprised someone hasn't already been down this 
path before.

cheers--steve
Greg Hartke wrote:

>Hi, Jeff,
>
>I'm not so sure this is correct.
>
>The IDAS LPS filter is a very different animal than the usual light
>pollution filters. It has relatively narrow stopbands at the frequency of
>selected spectral lines which appear in prevalent public lighting. Because
>the cometary spectrum really is farily broadband, most of the light from the
>comet will make it through. Of course there will be attenuation but it would
>normally be expected to be significantly less than that of the narrowband
>pollution sources.
>
>I would expect the IDAS LPS filter to be very much worth trying for this
>application.
>
>Greg Hartke
>Sykesville, MD
>
>  
>
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