Distance: 1,000 ly
https://en.wikipedia.org/wiki/California_Nebula

Equipment configuration and exposure data:

Mount: Orion HDX110 German equatorial mount controlled by TSXPro (Software Bisque) via EQASCOM
Telescope: Celestron RASA 11 V2. 11" f/2.2 Rowe-Ackermann Schmidt Astrograph, 620mm FL
Imaging camera: ZWO ASI2600MC Pro. Gain 100; Offset 21; Filter: Optolong L-eNhance. Image capture scale: AS/P=1.238" (i.e., unbinned). Resized to 50% for display.
Image capture software: Software Bisque TSXPro Camera Addon
Exposures: Best 9 of 10 @ 480s. Calibration: 0 bias frames, 13 darks, 9 flat frames; Autoguided.
Guide camera: ZWO ASI120MM Mini. Autoguide software: PHD2 Guiding 2.6.10dev2. Tracking: 0.50" Total RMS.
Post processing software: ImagesPlus6.5; LuminarAI from SkyLum; ThumbsPlus Pro 10.

Source image: 20211010_Cali-Neb_CombExcAvg2-IPddp-LumAI-TPadj1.tif