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NGC 7635 (Sh2-162, C11) -- Bubble Nebula revisited at longer focal length

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(@greg-erianne)
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The Bubble Nebula is a beautiful HII emission nebula in the Constellation Cas and is about 7,000 – 8,000 light years (ly) away from Earth, and about 7,000 ly wide.

At the center of the Bubble is SAO 20575, a very large, bright (magnitude -5.5), and hot Wolf-Rayet star that creates the stellar winds which form the Bubble.

The 1442mm focal length with a Ha/OIII filter on a OSC camera shows a nice bit of detail inside the bubble, despite only having about 3 hours of integration time at f/7 due to the target getting low in the sky.  The weather just hasn't allowed for follow-up sessions to acquire more imaging time.

Capture Date: 11/20/23

Celestron EdgeHD 800 w/0.7x reducer (fL = 1422mm)
ASI2600MC Pro (OSC camera)
Antlia ALP-T 2” mounted 5nm Dual Ha/OIII Narrowband Filter
ZWO AM5 mount with guiding via Celestron OAG and ASI174MM mini

Dual Narrowband Ha/OIII Filter Light Frames: 36 x 300s [Total Exposure 3:00; Average Moon illumination ~56%]

All light frames calibrated with dark, flat, and bias frames
Pre- and post-processed in PixInsight
Additional post-processing in Photoshop for exposure adjustments, cropping, and generation of reduced size jpeg


   
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(@greg-erianne)
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Joined: 2 years ago
Posts: 257
Topic starter  

Well, I thought I was finally out of patience after processing this image all weekend (see previous post) without having success integrating my SII/Hb data with the Ha/OIII data. But it was niggling at me, and I had to take one more stab at it to try and integrate my 2 hrs. of SII/Hb data into the image.  I was finally able to do it in Photoshop by putting the two separate RGB images together so I could change the blend and opacity.   Much easier, I think, than trying to do it in PixInsight!

The image isn't all that much different, but I think the OIII portion looks much more natural and blends better with the surrounding nebulosity.

Capture Date: 11/20/23
Average Moon illumination ~56%

Celestron EdgeHD 800 w/0.7x reducer (fL = 1422mm)
ASI2600MC Pro (OSC camera)
Antlia ALP-T 2” mounted 5nm Dual Ha/OIII Narrowband Filters: Ha/OIII; SII/Hb
ZWO AM5 mount with guiding via Celestron OAG and ASI174MM mini

Dual Narrowband Ha/OIII Filter Light Frames: 36 x 300s [Total Exposure 3:00 ]

Dual Narrowband SII/Hb Filter Light Frames: 24 x 300s [Total Exposure 2:00 ]
 
Total Integration Time: 5:00

 


   
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Terri Zittritsch
(@terri)
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Joined: 4 years ago
Posts: 310
 

Posted by: @greg-erianne

Well, I thought I was finally out of patience after processing this image all weekend (see previous post) without having success integrating my SII/Hb data with the Ha/OIII data. But it was niggling at me, and I had to take one more stab at it to try and integrate my 2 hrs. of SII/Hb data into the image.  I was finally able to do it in Photoshop by putting the two separate RGB images together so I could change the blend and opacity.   Much easier, I think, than trying to do it in PixInsight!

The image isn't all that much different, but I think the OIII portion looks much more natural and blends better with the surrounding nebulosity.

Capture Date: 11/20/23
Average Moon illumination ~56%

 

Celestron EdgeHD 800 w/0.7x reducer (fL = 1422mm)
ASI2600MC Pro (OSC camera)
Antlia ALP-T 2” mounted 5nm Dual Ha/OIII Narrowband Filters: Ha/OIII; SII/Hb
ZWO AM5 mount with guiding via Celestron OAG and ASI174MM mini

Dual Narrowband Ha/OIII Filter Light Frames: 36 x 300s [Total Exposure 3:00 ]

Dual Narrowband SII/Hb Filter Light Frames: 24 x 300s [Total Exposure 2:00 ]
 
Total Integration Time: 5:00

 

 

 

Hi Greg, beautiful image.    A great subject for a long focal length.   Nice colors and details.

Your patience pays off!

 

Terri

 


   
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(@greg-erianne)
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Joined: 2 years ago
Posts: 257
Topic starter  

@terri Thanks, Terri!  Now, if we ever get some decent weather I can put some more time into it.  Hope you're doing well.

Greg


   
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