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NGC 6535

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#1 Dan Crowson

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Posted 25 May 2020 - 11:43 AM

NGC 6535 (Melotte 189 and others) is a Shapley-Sawyer class XI (http://en.wikipedia....entration_Class) globular cluster located approximately 22,200 light-years away in Serpens Cauda.

2MASX J18032745-0017427 (PGC 61331 and others) is the galaxy to the right (west) of NGC 6535. It appears to be heavily obscured by dust.

Luminance – 24x600s – 240 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2

360 minutes total exposure – 6 hours

Imaged over nine nights in April and May, 2020 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.c...910046/sizes/l/

See the link above because the attached image has been down-sampled.

NGC%206535%20-%20CN%20-%20LRGB.jpg

Dan


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#2 sunnyday

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Posted 25 May 2020 - 11:53 AM

I don't know if it's my screen but I see several yellow brown stars.

thanks .



#3 bobFranke

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Posted 25 May 2020 - 03:58 PM

Excellent Dan,

 

I like the galaxy to the right of the cluster.

 

Cheers,
Bob
http://bf-astro.com/



#4 bobFranke

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Posted 25 May 2020 - 04:06 PM

I don't know if it's my screen but I see several yellow brown stars.

thanks .

Yes, that is basically what I see on my calibrated monitor. Given Dan's careful attention to color,  I suspect this image looks about right.

 

Also, the galactic extinction numbers show that, relative to the red, the blue is reduced by 0.6 magnitude and the green by 0.24. This will definitely shift the star color towards the yellow.

 

Cheers,
Bob
http://bf-astro.com/


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#5 Dan Crowson

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Posted 26 May 2020 - 01:19 AM

I use eXcalibrator for every image and I never selectively manipulate colors. This one is probably saturated a little more than usual but I think the color is fairly good.

Dan


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