Pickering Triangle

Click on the image for high res version. MOUSE OVER for Ha-OIII starless bicolor. Look also to the OIII starless hires and H-alpha starless hires.
In the center of Veil nebula lies a triangle of gas emitting mainly in H-alpha and OIII light. It is known as Pickering Triangle. A small part of the NGC 6960 is on the top edge, with the 52 Cyg star out of field.
The narrowband imaging improve very much the visibility of the thin structures of gas, and even more visibility is obtained by digitally removing the stars (look at the mouse over starless bicolor and the OIII and Ha only starless). Thanks to Nikita Misiura for his software StarNet++.
Technical Data
Optics TEC 140
Focal Length
 1011 mm
Focal Ratio f/7.2
Exposure Time Total 9 h 5 min, composed of OIII-Ha-RGB  270:210:25:20:20 min (single exp of 30 min for OIII and Ha, and 5 min for RGB)
CCD SBIG STL-11000M @-20°C and -25°C
Location Pian dell'Armà, pratone dei Milanesi (PV, Italian Apennines) at 1350 m height
Date
 28-29 June 2019 (2 nights)
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= (+19 to +16) °C, RH=(70 to 100) %
Sky brightness at zenith (with SQM-L) (21.4 to 21.6) mag/arcsec^2
Notes Quite hot and humid nights, but very dark even if not always perfectly transparent.

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