NGC 2237 / Caldwell 49 – The Rosette Nebula

Facts

The Rosette Nebula (also known as Caldwell 49) is a large, circular 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 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)
  • NGC 2246 – Part of the nebulous region

The cluster and nebula lie at a distance of some 5,200 light-years from Earth (although estimates of the distance vary considerably, down to 4,900 light-years.) 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.

It is believed that stellar winds from a group of O and B stars are exerting pressure on interstellar clouds to cause compression, followed by star formation in the nebula. This star formation is currently still ongoing.

A survey of the nebula with the Chandra X-ray Observatory in 2001 has revealed the presence of very hot, young stars at the core of the Rosette Nebula. These stars have heated the surrounding gas to a temperature in the order of 6 million kelvins causing them to emit copious amounts of X-rays (Wikipedia).

NGC2237_RosetteNebula_RGBHa_PI_Processed_2015-03-17_web

Object: NGC2037 / Caldwell 49 The Rosette Nebula
Date: 13.03.2015
Location: Backyard, Asker, NO
Camera: SBIG-STT-8300 MONO CCD
Optics: Takahashi FSQ-106EDX III (w/reducer) 385mm f/3.6
Exposure: Ha 10x1200sec + RGB 20×600(bin 2×2)
Filter: Astrodon Hydrogen Alpha 5nm + RGB
Calibration: Darks, Bias, Flats
Guiding: MaxIm DL, SBIG Selfguiding FW
Processing: PixInsight

Astrophotography of the rosette nebula NGC2237 Caldwell 49 in RGB + hydrogen alpha ( h-alpha Ha)

Object: NGC2037 / Caldwell 49 The Rosette Nebula
Date: 13.03.2015
Location: Backyard, Asker, NO
Camera: SBIG-STT-8300 MONO CCD
Optics: Takahashi FSQ-106EDX III (w/reducer) 385mm f/3.6
Exposure: Ha 10x1200sec + RGB 20×600(bin 2×2)
Filter: Astrodon Hydrogen Alpha 5nm + RGB
Calibration: Darks, Bias, Flats
Guiding: MaxIm DL, SBIG Selfguiding FW
Post processing: MaxIm DL, Photoshop CS5

Astrophotography of the rosette nebula NGC2237 Caldwell 49 in hydrogen alpha ( h-alpha Ha)

Object: NGC2037 / Caldwell 49 The Rosette Nebula
Date: 26.01.2015
Location: Backyard, Asker, NO
Camera: SBIG-STT-8300 MONO CCD
Optics: Takahashi FSQ-106EDX III 530mm f/5.0
Exposure: Ha 10x1200sec
Filter: Astrodon Hydrogen Alpha 5nm
Calibration: Darks, Bias
Guiding: MaxIm DL, SBIG Selfguiding FW
Post processing: MaxIm DL, Photoshop CS5

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