About image

The Rosette Nebula (NGC 2237) is a large emission nebula of approximately circular shape located in the constellation of the Unicorn: the name derives from the fact that in long exposure images it resembles a small rose.
The nebula occupies an area in the sky equal to approximately three times the Full Moon seen with the naked eye and is located at a distance of 5200 light years from Earth; it has an approximate size of 100 light years.

Regions in which new star formation processes are underway have been identified within the Rosette.
The Rosette is visible from a dark sky using very powerful binoculars, but appears very evanescent and gray in color (the human eye is not sensitive to colors in low lighting conditions): in photography however it is very evident even with short lenses focal.

Technical data
Optic         Tecnosky Apo refractor LT 130-910 with Riccardi reducer 0.75x (focal lenght 692mm, f/5.3)
Mount       Skywatcher EQ8
Camera                      Moravian G3-16200 with external filter wheel 7 positions
Filters                         Baader 50mm unmounted RGB , Ha 7nm, OIII 8.5nm
Guiding system         Artesky Ultraguide 70mm 
Exposure details    R 20x120" bin1 -20C

         G 20x120" bin1 -20C
            B 20x120" bin1 -20C

         Ha 29x600" bin1 -20C

         OIII 21x600" bin1 -20C                                     
Total integration       10h20'
Acquisition                Voyager, PHD2
Processing                Pixinsight 1.8, Photoshop CS5, StarXTerminator, NoiseXTerminator, BlurXTerminator
SQM-L                       Bortle 8    
Location                    Rescaldina (Italy), home terrace
Date                          26 November 2022, 16/17 November 2023