I had to enhance the data for the Squid using masks, since it's relatively dim and (as you said) I only had about 8 hrs of OIII narrowband data on it which, for this target, is really very little.

Not sure if I want to take the time to go back to it right now. I may wait until later in the summer when it's a bit higher and may try to collect more strictly narrowband data.

Greg

Best,

Terri

Sh2-129 is formed by emission of ionized hydrogen gas (Ha) and is shown in red in the image, while OU-4 is formed by emission of ionized oxygen gas (OIII) and is shown in blue/cyan in the image. 

At the center of OU-4, which is believed to be about 100,000 years old, is a very bright triple star system called HR 8119.  Multiple bow shocks can be seen alluding to the mechanisms that formed its complex shape. Some theorize that this is a planetary nebula (PN), but its size of about 50 ly is atypical for PN which are usually 1-3 ly (or less) in diameter.  OU-4 is quite a beautiful, but very dim, nebula.  I’ve enhanced/brightened it somewhat in order to be able to appreciate its complex structure against the backdrop of Sh2-129.

Capture Dates: 5/24, 5/25, 5/31, and 6/4/24

Askar 107PHQ with 0.7x reducer (fL = 524mm)
ASI2600MM Pro (Monochrome camera)
ZWO 7-position 2" Electronic Filter Wheel (EFW)
ZWO AM5 mount with guiding via SV106 and ASI178MM

Filters:
Antlia 3nm Narrowband OIII 2": 98×300″ (8:10)
Antlia 3nm Narrowband H-alpha 2": 25×300″ (1:20)
Antlia 3nm Narrowband SII  2": 25×300″ (:20)

Total Integration: 9:50 

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