IC1318a is an odd designation, given that IC1318 is the famous Butterfly/Sadr Nebula, and this is simply a nearby, but clearly separate, object. It’s not actually an entry in the IC catalog, and I can’t find the source of the “a” designation–if anyone knows where that started, please let me know. Thankfully, does have its own proper catalog ID: DWB82. But more recently, it’s become known as The Longhorn Nebula, which is a little more memorable.
- Exposures (-10ºC, gain=100):
- H-alpha: 52×180s
- SII: 33×180s
- OIII: 33×180s
- Total exposure time: 5 hours 54 minutes
- Taken from Doylestown, PA, Sep 6, 2023
- Telescope: TS-Optics Photoline 130 with 0.8x reducer (f/5.6)
- Camera: ZWO ASI2600MM-Pro with Astrodon filters (5 nm)
- Mount: iOptron CEM60
- Guiding: ZWO ASI178MM (off-axis)
- Acquisition: NINA + PHD2 and ASTAP
- Processing: AstroPixelProcessor, PixInsight
Deep-sky Imaging 
Such a fascinating region. 180 seconds seems to be the ideal exposure, enough detail, and more subs resulting in lower noise.