The Rosette Nebula (also known as Caldwell 49) is an H II region located near one end of a giant molecular cloud in the Monoceros region of the Milky Way Galaxy. The open cluster NGC 2244(Caldwell 50) is closely associated with the nebulosity, the stars of the cluster having been formed from the nebula's matter.

The complex has the following New General Catalogue (NGC) designations:

• NGC 2237 – Part of the nebulous region (Also used to denote whole nebula)
• NGC 2238 – Part of the nebulous region
• NGC 2239 – Part of the nebulous region (Discovered by John Herschel)
• NGC 2244 – The open cluster within the nebula (Discovered by John Flamsteed in 1690)[citation needed]
• NGC 2246 – Part of the nebulous region
Details of image:
📷 Exposures (Ha, OIII, SII)
Hα, bin 1, 80x 300s
OIII, bin 1, 80 x 300s
SII, bin 1, 100 x 300s

🔭 Equipment
Mount: RainbowAstro RST-150H 
Telescope: Refractor Borg 107FL , f/3.9, 107mm aperture, 417mm focal length 
Camera: Atik 383L+ (Kodak KAF8300 sensor)
Filters: Atik 9-position filter wheel
Guidescope: QHY mini guide scope
Guide camera: QHY 5-II

💻 Software: 
(Windows 10) Sequence Generator Pro, PHD2, SkySafari, ASCOM drivers
(Mac OSX) PixInsight
Lausanne, Switzerland
Bright suburban light pollution, Class 6 of darkness in Bortle scale.
Older versions:
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