Hemisphere:  Northern  ·  Constellation: Monoceros (Mon)  ·  Contains:  12 Mon  ·  NGC 2237  ·  NGC 2238  ·  NGC 2239  ·  NGC 2246  ·  NGC 2252  ·  NGC2237  ·  NGC2238  ·  NGC2239  ·  NGC2244  ·  NGC2246  ·  NGC2252  ·  Rosette A  ·  Rosette B  ·  Rosette Nebula  ·  Rosette nebula  ·  Sh2-275  ·  The star 12Mon
Rosette Nebula in SHO, 


Rosette Nebula in SHO, 



Rosette Nebula in SHO

Rosette Nebula in SHO, 


Rosette Nebula in SHO, 



Rosette Nebula in SHO

Technical card

Imaging telescopes or lenses: Stellarvue SV080ST

Imaging cameras: ZWO ASI1600MM-PRO

Mounts: ORION HDX-110 EG-G

Guiding telescopes or lenses: Stellarvue SV080ST

Guiding cameras: QHY5-III 290MM guide camera

Focal reducers: Stellarvue SFF3-25-48 flattener

Software: PHD Labs PHD 2 Guiding  ·  Sequence generator pro  ·  Carte Du Ciel 3.10

Filters: Astronomik OIII 36mm 6nm  ·  Astronomik H-Alpha 36mm 6nm

Accessory: QHYOAG-M

Dates:Jan. 3, 2021Jan. 4, 2021Jan. 7, 2021

Astronomik 6nm SII 36mm: 76x300" (6h 20') (gain: 200.00) -15C bin 1x1
Astronomik H-Alpha 36mm 6nm: 70x300" (5h 50') (gain: 200.00) -15C bin 1x1
Astronomik OIII 36mm 6nm: 70x300" (5h 50') (gain: 200.00) -15C bin 1x1

Integration: 18h

Darks: ~40

Flats: ~40

Flat darks: ~40

Avg. Moon age: 20.85 days

Avg. Moon phase: 62.91%

Bortle Dark-Sky Scale: 5.00

Astrometry.net job: 4261337

RA center: 6h 32' 30"

DEC center: +4° 57' 56"

Pixel scale: 1.615 arcsec/pixel

Orientation: -33.140 degrees

Field radius: 1.272 degrees

Resolution: 4485x3471

Data source: Backyard


This is my first image in SHO using my SV80. A single FOV captures the full nebula. This is my 2nd capture of the Rosette and this is much better than my first image.

From Wikipedia:

The Rosette Nebula (also known as Caldwell 49) 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.

A survey of the nebula with the Chandra X-ray Observatory has revealed the presence of numerous new-born stars inside optical Rosette Nebula and studded within a dense molecular cloud. Altogether, approximately 2500 young stars lie in this star-forming complex, including the massive O-type stars HD 46223 and HD 46150, which are primarily responsible for blowing the ionized bubble. Most of the ongoing star-formation activity is occurring in the dense molecular cloud to the south east of the bubble.

A diffuse X-ray glow is also seen between the stars in the bubble, which has been attributed to a super-hot plasma with temperatures ranging from 1 to 10 million K. This is significantly hotter than the 10,000 K plasmas seen in HII regions, and is likely attributed to the shock-heated winds from the massive O-type stars.



  • Final
    Rosette Nebula in SHO, 


  • Rosette Nebula in SHO, 




Description: Starless version

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Sky plot

Sky plot


Rosette Nebula in SHO,