Hemisphere:  Northern  ·  Constellation: Monoceros (Mon)  ·  Contains:  NGC 2237  ·  NGC 2238  ·  NGC 2239  ·  NGC 2246  ·  NGC 2252  ·  Rosette A  ·  Rosette B  ·  Rosette Nebula  ·  The star 12Mon
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The Rosette Nebula, Caldwell 49, 


            Steven Bellavia
The Rosette Nebula, Caldwell 49
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The Rosette Nebula, Caldwell 49

Technical card

Imaging telescopes or lenses: William Optics RedCat 51 Petzval APO

Imaging cameras: ZWO ASI 183MM Pro

Mounts: Sky-Watcher EQ-6R Pro SynScan

Guiding telescopes or lenses: The Bellavia Micro 25mm f/6.2 guidescope

Guiding cameras: ASI224MC

Software: Pleiades Astrophoto PixInsight  ·  IDEIKI AstroPhotography Tool (APT)  ·  Topaz Denoise AI  ·  Stark Labs Nebulosity 4.2  ·  Digital Photo Professional  ·  Annie's Astro Actions V7  ·  Noel Carboni's Astro Tools for PhotoShop Noel Carboni Actions  ·  SharpCap Pro 3.2  ·  PHD2 Guiding

Filters: Astronomik 6nm OIII  ·  Astronomik 6nm Ha  ·  R  ·  B  ·  G

Dates:Jan. 10, 2021

Astronomik 6nm Ha: 20x240" (gain: 111.00) -15C bin 1x1
Astronomik 6nm OIII: 20x240" (gain: 111.00) -15C bin 1x1
B: 30x60" (gain: 111.00) -15C bin 1x1
G: 30x60" (gain: 111.00) -15C bin 1x1
R: 30x60" (gain: 111.00) -15C bin 1x1

Integration: 4.2 hours

Darks: ~30

Flats: ~30

Flat darks: ~30

Avg. Moon age: 26.60 days

Avg. Moon phase: 9.40%

Bortle Dark-Sky Scale: 4.00

Mean SQM: 20.50

Mean FWHM: 4.00

Temperature: -5.00

Basic astrometry details

Astrometry.net job: 4145003

RA center: 6h 32' 12"

DEC center: +5° 0' 43"

Pixel scale: 1.998 arcsec/pixel

Orientation: 88.229 degrees

Field radius: 1.747 degrees

Resolution: 5238x3492

Data source: Traveller


The Rosette Nebula, Caldwell 49, is a large spherical 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 are 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.


Sky plot

Sky plot


The Rosette Nebula, Caldwell 49, 


            Steven Bellavia

In these public groups

William Optics CAT Series