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By Alfredo Beltran
This is my version of the Rosette nebula using the Hubble and taken with the ASI071 OSC camera. Telescope was a C925 EdgeHD with Hyperstar lens.
Exposure time: 4hr 50 min in total at unity gain
2hr 00 min (24 x 5 min) Ha
1h 15 min (55 x 5 min) OIII
1hr 35 min (19 x 5 min) SII
This setup is awesome. A few years ago such an image just could’ve been taken with a monochrome ccd.
I went to my family house in the countryside and was able to take some pictures during xmas eve.
Total exposure: 6h
H_Alpha: ~3h (730x15s) --> R, G
Oxigen III: ~3h (710x15s) --> B, G
I didn't have a view on Polaris and could not spend too much time drift aligning (it was xmas eve after all :D) hence the short exposures. Moreover I dont have the proper connection rings to put my flattener on my mono camera so all stars off center are a mess :_(.
Rosette Nebula in HAlpha
Object ID: NGC2237, 2238, 2239, 2244 & 2246
Exposure Date: January 2019
Distance: 5200 LY
Exposures: HII: 30x600s ISO1600
Telescope: BOSMA Beta RE
Focal length: 500mm
Camera: Full Spectrum Modded & Cooled Canon 40D
Guiding: Celestron Off Axis Guider/PHD2 Guiding