Sh2-73, (also known as Sharpless 73, LBN 105 & LBN 106) is a molecular cloud lit by the Milky Way’s integrated flux in the Northern constellation of Hercules. This region was mistakenly listed in the Sharpless catolog and was originally thought to be an HII region. The nebula covers a wide area and it is illuminated by the integral radiation field originating from the galactic plane. These very faint reflection nebulae lie at a relatively high galactic latitude (about 45°) and are categorized as integral flux nebulae to indicate the particular source of illumination.

Telescope: Planewave Delta Rho 350 f3.0
Mount: Astro Physics 3600GTO “El Capitan”
Camera: ZWO ASI461MM pro / EFW-7
Guider: ZWO OAG-L-68 / ZWO ASI174mm Mini
Filters: Astrodon II 50mm Sq LRGB

L: 116×5 mins = 580 mins, R: 48×5 mins = 240 mins, G: 38×5 mins = 190 mins, B: 41×5 mins = 205 mins

Total Imaging Time: 20h 15m

Data Imaged remotely on 7 nights during April & May, 2025.
Data acquisition & Processing by David Churchill.

Nona