SBIG ST-4000XCM
6x1800sec (3 Hours)
Darks/Flats/Bias Applied
Imager Temp -10C
APM/TMB 130/780
Field Flattener
Baader 7nm H alpha filter
Red Channel Only
Full Frame

Link to medium large JPEG

Imaged during a waning gibbous moon.

The Propeller Nebula seems to have been missed in many catalogs. While seeming relatively bright in widefield images, the fine detail is deceptively hard to bring out.

DWB111, or the "Propeller Nebula" is listed in the DWB catalog, a somewhat lesser-known document developed by H. R. Dickel, H. Wendker and J. H. Bieritz cataloging 193 distinct objects as part of their study of H-alpha emission nebula in the Cygnus X region of the sky. This nebula is also listed as Simeis 57 and MRSL 479.

July 13, 2009