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Sharpless 101

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#1 Dan Crowson

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Posted 13 June 2018 - 03:21 PM

Sharpless 101 (LBN 168 or the Tulip Nebula), is a nice emission nebula located approximately 6,000 light-years away in Cygnus.

 

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

 

360 minutes total exposure – 6 hours

 

I ended up collecting 12 hours of Ha data but did not use it for this image.

 

Imaged over 12 nights in May and June, 2017 and June, 2018 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...4161344/sizes/l

 

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

 

Sh2-101%20-%20CN%20-%20LRGB.jpg

 

Dan


  • buckeyestargazer, Cristina Cellini, jpbutler and 2 others like this

#2 Cristina Cellini

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Posted 13 June 2018 - 03:34 PM

Very nice! Why did not use H-alpha?

 

Cristina



#3 Dan Crowson

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Posted 13 June 2018 - 07:25 PM

Cristina,

 

the Ha didn't seem to add much of anything to the image. I was never happy with the HaRGB so I held off until I could collect some LRGB this season.

 

Dan



#4 Cristina Cellini

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Posted 14 June 2018 - 06:43 AM

I understand. Can I ask you if you tried to mix h-alpha only to red channel?

 

Cristina



#5 schmeah

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Posted 14 June 2018 - 08:50 AM

Nice image Dan. I agree that some targets are overwhelmed by Ha and never look good as a color image when Ha is used. This is one of those targets where the translucent look of the LRGB is more appealing IMO.

 

Derek



#6 Dan Crowson

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Posted 14 June 2018 - 02:15 PM

I understand. Can I ask you if you tried to mix h-alpha only to red channel?

 

Cristina

Yes, that's what I tried to do. While I have PixInsight, i don't really use it. My method is to boost the Ha up to the Red signal background levels and then blend it 70/30 into the Red. I'm always looking for suggestions.

Dan




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