NGC 6749


Dan Crowson
 

NGC 6749 (Berkeley 42) is a Shapley-Sawyer class XII (http://en.wikipedia.org/wiki/Shapley%E2%80%93Sawyer_Concentration_Class) globular cluster located approximately 5,935 light-years away in Aquila.

 

Luminance – 26x600s – 260 minutes – binned 1x1

RGB – 8x300s – 40 minutes each – binned 2x2

 

380 minutes total exposure – 6 hours 20 minutes

 

Imaged eight nights in May and June, 2021 from Dark Sky New Mexico at Rancho Hidalgo (Animas, New Mexico) with a SBIG STF-8300M on an Astro-Tech AT12RCT at f/8 2432mm.

 

LRGB - https://www.flickr.com/photos/dcrowson/51240171230/sizes/l/

 

Dan

----          
Dan Crowson                          dcrowson@...
Dardenne Prairie MO               http://www.crowson.com

 


Bernard Miller
 

Dan,

 

That is a lot of red stars. This must be really old. Any idea on the age of this globular?

 

Bernard

 

 

From: DarkSkyNewMexico@groups.io On Behalf Of Dan Crowson
Sent: Thursday, June 10, 2021 6:21 PM
To: 'Dan Crowson' <dcrowson@...>
Subject: [DarkSkyNewMexico] NGC 6749

 

NGC 6749 (Berkeley 42) is a Shapley-Sawyer class XII (http://en.wikipedia.org/wiki/Shapley%E2%80%93Sawyer_Concentration_Class) globular cluster located approximately 5,935 light-years away in Aquila.

 

Luminance – 26x600s – 260 minutes – binned 1x1

RGB – 8x300s – 40 minutes each – binned 2x2

 

380 minutes total exposure – 6 hours 20 minutes

 

Imaged eight nights in May and June, 2021 from Dark Sky New Mexico at Rancho Hidalgo (Animas, New Mexico) with a SBIG STF-8300M on an Astro-Tech AT12RCT at f/8 2432mm.

 

LRGB - https://www.flickr.com/photos/dcrowson/51240171230/sizes/l/

 

Dan

----          
Dan Crowson                          dcrowson@...
Dardenne Prairie MO               http://www.crowson.com

 




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Dan Crowson
 

Bernard,

 

I should have included that this one is heavily reddened due to imaging through an arm of the milky way. It is considered the roughest globular to view visually. I think the surface brightness is something close to mag 22. There’s a decent article here - https://www.cloudynights.com/articles/cat/articles/astronomical-history/ngc-6749-aquila-%e2%80%94-tough-cookie-soft-heart-r2826.

 

Dan

----          
Dan Crowson                          dcrowson@...
Dardenne Prairie MO               http://www.crowson.com

 

From: DarkSkyNewMexico@groups.io [mailto:DarkSkyNewMexico@groups.io] On Behalf Of Bernard Miller
Sent: Thursday, June 10, 2021 10:23 PM
To: DarkSkyNewMexico@groups.io
Subject: Re: [DarkSkyNewMexico] NGC 6749

 

Dan,

 

That is a lot of red stars. This must be really old. Any idea on the age of this globular?

 

Bernard

 

 

From: DarkSkyNewMexico@groups.io On Behalf Of Dan Crowson
Sent: Thursday, June 10, 2021 6:21 PM
To: 'Dan Crowson' <dcrowson@...>
Subject: [DarkSkyNewMexico] NGC 6749

 

NGC 6749 (Berkeley 42) is a Shapley-Sawyer class XII (http://en.wikipedia.org/wiki/Shapley%E2%80%93Sawyer_Concentration_Class) globular cluster located approximately 5,935 light-years away in Aquila.

 

Luminance – 26x600s – 260 minutes – binned 1x1

RGB – 8x300s – 40 minutes each – binned 2x2

 

380 minutes total exposure – 6 hours 20 minutes

 

Imaged eight nights in May and June, 2021 from Dark Sky New Mexico at Rancho Hidalgo (Animas, New Mexico) with a SBIG STF-8300M on an Astro-Tech AT12RCT at f/8 2432mm.

 

LRGB - https://www.flickr.com/photos/dcrowson/51240171230/sizes/l/

 

Dan

----          
Dan Crowson                          dcrowson@...
Dardenne Prairie MO               http://www.crowson.com

 

 


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