Hemisphere:  Northern  ·  Constellation: Monoceros (Mon)  ·  Contains:  NGC 2239  ·  NGC 2244  ·  Rosette nebula  ·  The star 12Mon
Rosette Nebula, 


            Chris Howard
Rosette Nebula
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Rosette Nebula, 


            Chris Howard
Rosette Nebula
Powered byPixInsight

Technical card

Imaging cameras: Atik 414ex Mono

Mounts: iOptron CEM25P

Guiding telescopes or lenses: William Optics 50mm Guidescope Guide scope

Guiding cameras: ZWO ASI120MM Monochrome

Focal reducers: William Optics 0.8x Reducer/Flattener

Software: INDI/Ekos Observatory Control Software

Filters: Astonomik 1.25" Ha 6nm , 12nm Oiii, Sii set

Accessory: Atik EFW2 filter wheel

Dates:Dec. 1, 2017

Frames: 28x600" (4h 40')

Integration: 4h 40'

Avg. Moon age: 12.29 days

Avg. Moon phase: 93.21%

Basic astrometry details

Astrometry.net job: 1843934

RA center: 6h 31' 56"

DEC center: +4° 58' 51"

Pixel scale: 3.956 arcsec/pixel

Orientation: 81.819 degrees

Field radius: 0.823 degrees

Resolution: 1024x736

Data source: Backyard


December 1, 2017 - We were very close to a full moon last night, so my astro imaging options were limited to narrowband. I spent most of the night with Hydrogen-alpha, an inexpensive 12nm Astronomik filter, but as you can see, able to bring out some fantastic contrast, depth, and details throughout this region of interstellar ionized hydrogen. (This is the filter I currently have in the 1.25" wheel. My Baader 6nm Ha is in the 2" filter wheel)

The "Rosette Nebula" is a cluster of nebulosity that includes NGC 2237, NGC 2238, NGC 2244, NGC 2239, NGC 2246 and more. The Rosette is a bright mag 9 area of the sky about 1.3° across in the constellation Monoceros. (subframe info: 28 600 second exposures in hydrogen-alpha, no calibration frames, Atik414Ex mono CCD running at -10C, Astronomik 12nm Ha filter, William Optics GT-81, CEM25P EQ mount, WO 50mm guidescope with ZWO ASI120S-MM guide cam, INDI/KStars/Ekos observatory control).


Sky plot

Sky plot


Rosette Nebula, 


            Chris Howard