CTB 1/SNR G116.9+00...
 
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CTB 1/SNR G116.9+00.1 (“Garlic Nebula”, “Medulla Nebula”)

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(@greg-erianne)
Honorable Member
Joined: 3 years ago
Posts: 383
Topic starter  

CTB-1 is in the constellation Cassiopeia (Cas) and is approximately 10,000 light-years from Earth, about 100 light-years in diameter, and is estimated to have formed about 10,000 years ago.  It is nearby several other emission nebulae: Sh2-170 (the dot in the Cosmic Question Mark), Sh2-168, and Sh2-173 to name a few.  In addition, there are two other SNRs in the frame: SNR G117.7+00.6 in the lower left of the frame, and SNR G116.5+01.1 in the upper left of the frame (although it’s not well defined).

CTB-1 has an interesting circular structure with many filamentary structures as well as a rupture in its shell (on the lower left of the SNR), has a slim and faint OIII signal on part of its shell, and is surrounded by additional nebulosity, both close to its shell and farther away.

CTB-1 was initially identified by George Abell as planetary nebula, Abell 85, but was later identified as a supernova remnant (G116.9+0.1) in 1972.  The CTB designation is from the Caltech Observatory list B catalogue. The designation Abell 85 is still used today.

I imaged this last year (I think), but wanted to get more time on the target since it has some very interesting detail.

Capture Dates: 10/1, 10/3, 10/5, 10/12, 10/18, and 10/19/24

Rig 1:
Stellarvue SVX90T Apochromatic Refractor @native 540mm fL (1.44”/px)
Guidescope/Cam: SV106 with ASI120mm mini
ASIAir Plus, ASI2600MM, ZWO AM5 mount, ZWO 7-position 2” filter wheel

Rig 2:
Askar 107PHQ with 0.7x reducer at fL = 524mm, f/4.9 (1.47”/px)
Guidescope/Cam: SV106 with ASI178mm
ASIAir Plus, ASI2600MM, ZWO AM5 mount, ZWO 7-position 2” filter wheel

 

Filters:
Antlia 3nm Narrowband H-alpha 2": 121×300″ [10:05]
Antlia 3nm Narrowband SII  2": 129×300″ [10:45]
Antlia 3nm Narrowband OIII 2": 187×300″ [15:45]
Antlia Pro V RGB 2” (for stars): 44x60s [0:44]

 

Total Integration Time: 37:09

Processed in PixInsight and Adobe Photoshop

This topic was modified 2 weeks ago by Greg Erianne

   
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(@peter-gillette)
Eminent Member
Joined: 4 years ago
Posts: 34
 

Wonderful image, Greg! Excellent handling of color and detail. Reminds me that it's time for me to plant next year's crop!!!!

                                         -P-


   
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(@greg-erianne)
Honorable Member
Joined: 3 years ago
Posts: 383
Topic starter  

@peter-gillette Thank you, Peter!  That's funny.  Do you grow garlic?

Greg


   
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Terri Zittritsch
(@terri)
Member - Treasurer
Joined: 5 years ago
Posts: 401
 

Greg, beautiful image of this small object.   The filamentary objects like the SN remnents are some of the most beautiful.   Wow, 37 hours..geeee      Some day I'd like to capture it but need to get some longer focal length as I think it's fairly small.

 

Terri


   
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(@greg-erianne)
Honorable Member
Joined: 3 years ago
Posts: 383
Topic starter  

@terri Thanks, Terri!  I really do love SNRs as well.  Some are gambles and you wind up with nothing after 20 hours (I've had more than a few of those!), but the ones that work out usually make some nice images.

Greg


   
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