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Date: 06 Aug 2006 23:35:56
From: canopus56
Subject: Ann: Web notes on finding telescopic limiting magnitude
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This is to announce a webpage that collects materials on finding
telescopic limiting magnitude (TLM) with a good degree of accuracy.
members.csolutions.net/fisherka/astronote/plan/tlmnelm/LimitMagFields.htm
A step-by-step procedure for beginners that uses Clark's 9 magnitude
charted open clusters are used in connection with Schaefer's TLM
algorithm is provided.
A more in-depth discussion that may appeal to intermediate amateurs is
provided.
Other features included referenced in the webnote are:
1) An NELM-to-MPSAS and MPSAS-to-NELM javascript calculator
2) A TLM and NELM areas
3) A Cartes du Ciel external database that marks A) 10 TLM measuring
areas, B) 24 Landolt photometry fields on the celestial equator for use
as TLM areas for small telescopes, and C) 44 NELM measuring fields of
the IMO and McBeath.
4) An Excel worksheet that aids in finding your telescope's TLM based
on the above.
5) Bibliography
Any corrections to errors found in the site are welcomed and
appreciated.
This web note collects materials that grew out of a series of SAA
discussions during 2003 and 2004.
- Canopus56
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Date: 07 Aug 2006 08:28:21
From: starburst
Subject: Re: Ann: Web notes on finding telescopic limiting magnitude
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Interesting page, thanks. You might also want to take a look at Samir
Kharusi's pages on astrophotography, especially this one on measuring
skyfog with a digital camera:
http://www.pbase.com/samirkharusi/image/37608572
Samir's site is a little difficult to navigate, but is worth the
trouble. Tons of good info, and his astrophotographs are impressive.
Chris
canopus56 wrote:
> This is to announce a webpage that collects materials on finding
> telescopic limiting magnitude (TLM) with a good degree of accuracy.
> members.csolutions.net/fisherka/astronote/plan/tlmnelm/LimitMagFields.htm
>
> A step-by-step procedure for beginners that uses Clark's 9 magnitude
> charted open clusters are used in connection with Schaefer's TLM
> algorithm is provided.
>
> A more in-depth discussion that may appeal to intermediate amateurs is
> provided.
>
> Other features included referenced in the webnote are:
>
> 1) An NELM-to-MPSAS and MPSAS-to-NELM javascript calculator
>
> 2) A TLM and NELM areas
>
> 3) A Cartes du Ciel external database that marks A) 10 TLM measuring
> areas, B) 24 Landolt photometry fields on the celestial equator for use
> as TLM areas for small telescopes, and C) 44 NELM measuring fields of
> the IMO and McBeath.
>
> 4) An Excel worksheet that aids in finding your telescope's TLM based
> on the above.
>
> 5) Bibliography
>
> Any corrections to errors found in the site are welcomed and
> appreciated.
>
> This web note collects materials that grew out of a series of SAA
> discussions during 2003 and 2004.
>
> - Canopus56
>
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Date: 07 Aug 2006 09:02:22
From: canopus56
Subject: Re: Ann: Web notes on finding telescopic limiting magnitude
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"starburst" <nope@nospam.net > wrote in message
news:eb7f5i$log$1@geraldo.cc.utexas.edu...
> You might also want to take a look at Samir Kharusi's pages on
> astrophotography, especially this one on measuring skyfog with a digital
> camera:
> http://www.pbase.com/samirkharusi/image/37608572
Thanks for the reference. It looks like a good read. - Canopus56
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