Location of Photo:
Pommier Observatory, Portland, OR, USA
Date/Time of photo:
2017-07-18 through 2019-08-20
Celestron Compustar C14 with Starizona LF reducer/corrector (f/7,5). SBIG STL 11000 CCD camera with Baader Planetarium HaRGB filters. Exposures: HaRGB=690:210:190:225 minutes=21 hours, 55 minutes total exposure.
This portion of the Cygnus Loop Supernova Remnant, located between the Veil and Witch's Broom nebulae is commonly known as Pickering's Triangle. However, it was actually an employee of Edward Charles Pickering, Willamina Fleming who discovered it while examining a glass plate at Harvard College Observatory. However, as was the custom of the time, the credit went to Pickering. Pickering was a progressive man, employing many women at the observatory, several of whom made major contributions to astronomy, such as Annie Jump Cannon, Antonia Maury, and Cecelia Payne. Fleming also discovered the Horsehead Nebula in Orion and the first white drawf, 40 Eridani B.