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NGC2237 / Rosette Nebula

Classification: Nebula / Open cluster NGC2237 / NGC2238-39-44-46 LBN948 / Sh2-275 / C49
Constellation: Monoceros (MON)
Object Location: Ra 06h 31m 44s Dec +05° 02’00° (current)
Size & Distance: 80.0 x 80.0 Apx 5200 light years.

Date & Location: 01-25-2020 Little Blair Valley, CA.
Exposure: Hubble Palette SHO, 90,90,90, 6x15 ec. (bin 1x1)
Optics: Telescope Engineering Company APO110FL w/ TEC FF @ f/5.74, 631mm using the Optec FocusLynx.
Mount: Astro-Physics 1200 GTOCP4 / ATS 10x36 pier.
Camera: FLI-PL16803 @-25c / FLI CFW5-7 / Guided by SBIG ST-I / w OAG.
Filters: Astrodon 50mm square, 3nm Ha, Sll, Olll
Software: MaxImDL 6.11, Photoshop CC, CCDStack, Topaz Studio.

Notes: Sky conditions: Average seeing, Temp range 45-30°
Image Field of view is 200x200 arcmin. Image Scale 2.94 arcsec/pix

The Rosette Nebula 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. NGC2237 is the nebula and the open cluster NGC 2244 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 some 5,200 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 cluster of stars is visible in binoculars and quite well seen in small telescopes while the nebula itself is more difficult to spot visually and requires a telescope with a low magnification. A dark site is a must to see it. Photographically the Rosette Nebula is easier to record and it is the only way to record the red color which is not seen visually.