SUNSET: 
0
Photographer:
Rod Pommier
Location of Photo:
Pommier Observatory, Portland, OR, USA
Date/Time of photo:
2017-07-18 through 2019-08-20
Equipment:
Telescope/Mount:Celestron Compustar C14 with Starizona LF reducer/corrector (f/7.5). Camera: SBIG STL 11000M with Baader Planetarium HaRGB filters. SBIG AO-L adaptive optics @ 3 Hz. Exposures: Ha:R:G:B = 690:210:190:225 minutes = 21 hours, 55 minutes total exposure
Description:
This object is formally known as Pickering’s Triangle, named after Edward Pickering, director of the Harvard College Observatory in the late 19th and early 20th centuries. It is part of the Cygnus Loop supernova remnant lying between the Veil and Witch’s Broom Nebulae. Edward Pickering was a progressive visionary for his time, employing over 80 women at the observatory, including several who made substantial contributions to astronomy, like Annie Jump Cannon, Antonia Maury, Celia Payne, and Willamina Fleming. This part of the supernova was actually discovered on a photographic plate by Willamina Fleming but, as was the custom of the time, the credit went to Pickering. Hence, I like to call it Picker-Flem-ing’s Triangle.
