NGC 2237. The Rosette Nebula. HR-Wide Field


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This image of NGC 2237, also known as the Rosette Nebula or Caldwell 49, is the result of a joint project between Aleix Roig and myself. Aleix took the wide field images (Takahashi FSQ85), in narrowband (also in RGB, but these images were mainly used to give the stars a real color), to which I added a two-panel mosaic (taken with a  CDK 20″ a year ago) of the inner structure to increase its resolution. The different filters have been color-mapped as to reproduce the visible spectrum of the nebula (“natural color”), with SII mapped to Red, OIII both to Blue and Green and Halpha to Red and 15% of Blue (to account for Hbeta). Please find Aleix’s image here.

Additional Information


Name(s): NGC 2237. The Rosette Nebula. Caldwell 49

Type: Emission Nebula

RA:  06h 30m 17s

Dec: +05º 02’ 55”

Constellation: Monoceros

Size (arcmin): 80×60

Magnitude: +5.5

Distance: 5,500 ly


Date: November 2016-February 2017 (CDK 20″) and December 2017-January 2018 (FSQ85)

Location:, SSO near Coonabarabran, NSW Australia (CDK 20″) and Prades, Cataslonia (FSQ85)

Size (arcmin): 2×1.6 deg

Telescope: Planewave CDK 20” f/6.8 and Takahashi FSQ 85 f/5.3

Camera: SBIG STX16803 (4096x4096pix) (CDK 20″ and ASI1600MM-C Pro (FSQ 85)

Guiding: Astrodon MonsterMOAG off-axis guider and ZWO OAG (FSQ 85)

Total exposure: 35.5 hours (Wide Field: 12h; CDK: 23.5 h)

Processing: CCDStack, Photoshop CC 2018 and PixInsight 1.8

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