Dark Nebulae in Cygnus, 3nm Ha

May 31, 2023

LDN 935, 933 (dark nebulae), the "Gulf of Mexico" region of NGC 7000, the North America Nebula in Cygnus.

Dark nebula Dobashi 2961, et al. below the North America Nebula, 3 nanometer hydrogen-alpha:

Atlas and Catalog of Dark Clouds Based on the 2 Micron All Sky Survey
Kazuhito Dobashi, Publications of the Astronomical Society of Japan, Volume 63, Issue sp1, 25 January 2011, Pages S1–S362, https://doi.org/10.1093/pasj/63.sp1.S1