Pickering’s Triangle is a prominent filamentary structure within the Veil Nebula, a supernova remnant located in the constellation Cygnus at an approximate distance of 2,400 light-years. The Veil Nebula is the expanding debris field from a supernova explosion that occurred roughly 10,000–20,000 years ago, and Pickering’s Triangle represents a complex region where the shock front interacts with the surrounding interstellar medium.
The structure of this region is dominated by intricate, thread-like filaments formed as the expanding shock wave compresses and heats the surrounding gas. Emission from ionized oxygen and hydrogen traces different layers of the shock interaction, revealing fine-scale structure and variations in density. The delicate, web-like appearance of the filaments reflects the turbulent nature of the expanding remnant and the inhomogeneous distribution of the ambient medium.
This image was created using narrowband H-alpha, SII and OIII data along with broadband RGB stars acquired from Arnold, CA. The data were collected between October 10 and November 20, 2023, with a total integration time of 47 hours. The processing emphasizes the contrast between hydrogen and oxygen emission, highlighting the fine filamentary structure of the shock front while preserving natural star color and the depth of the surrounding star field.