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Rosette Nebula by Dave Collings

Submitted by Chelsea Chin

Rosette Nebula

“The Rosette Nebula 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 cluster and nebula lie at a distance of 5,000 light-years from Earth and measure roughly 130 light years in diameter. The radiation from the young stars excites the atoms in the nebula, causing them to emit radiation themselves producing the emission nebula we see. The mass of the nebula is estimated to be around 10,000 solar masses.

  • PlaneWave Instruments 12.5” CDK with 0.66 PW reducer to capture the image.
  • Main camera is the ATIK 16200 Mono with EFW-3 filter wheel and Chroma filters.
  • The mount is an Astro-Physics AP1100 GTO CP4.
  • Total integration time is over 20 hours of Ha, OIII, & SII from 4 quadrants of images to make up this beautiful Mosaic.
  • It took over 3 weeks to capture all the images required to process this Mosaic.


David Collings – Blue Ridge Observatory | Sparta, North Carolina  USA