Hemisphere:  Northern  ·  Constellation: Monoceros (Mon)  ·  Contains:  11.86  ·  12 Mon  ·  130 Elektra  ·  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
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            Joey Troy
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Imaging telescopes or lenses: William Optics Redcat 51

Imaging cameras: ZWO ASI533MC Pro

Mounts: Sky-Watcher EQM 35 Pro

Guiding telescopes or lenses: ZWO 30mm f/4 Mini Guide Scope

Guiding cameras: ZWO ASI 120 Mini Mono

Software: Pixinsight

Filters: Optolong L-eXtreme 2"

Accessory: ZWO EAF Electronic Auto Focuser  ·  ZWO ASI Air Pro

Dates:Feb. 4, 2021Feb. 5, 2021

Frames:Optolong L-eXtreme 2": 25x600" (gain: 101.00) -10C bin 1x1

Integration: 4.2 hours

Darks: ~10

Flats: ~10

Bias: ~10

Avg. Moon age: 22.42 days

Avg. Moon phase: 47.14%

Bortle Dark-Sky Scale: 3.00

Mean FWHM: 5.37

Astrometry.net job: 4207545

RA center: 6h 32' 3"

DEC center: +5° 3' 50"

Pixel scale: 1.573 arcsec/pixel

Orientation: -99.303 degrees

Field radius: 1.859 degrees

Resolution: 6016x6016

Locations: Backyard, Belen, NM, United States

Data source: Backyard


The Rosette Nebula (Caldwell 49) is a large spherical H-II region, near the huge molecular cloud in the constellation Unicorn (Monoceros). The cluster and nebula are about 5,000 light years away from Earth and have a diameter of about 130 light years. The mass of the nebula is estimated at about 10,000 solar masses.

In the centre of the Rosette Nebula lies the open cluster NGC 2244 (Caldwell 50), which is formed by the matter of the nebula. Gases are stimulated to glow by the surrounding hot O and B type stars. In the centre of the nebula, NGC 2244 has already cleared a bubble about 12 light years in size due to strong solar winds. Gas clouds still expand by some 20 km/s, so some spectacular star clusters will remain in a few million years.

The Rosette Nebula contains hydrogen and dust, which reflects the light of the very hot stars in NGC 2244, especially in the blue. The pronounced OIII line in the spectrum of the Rosette Nebula is also interesting, which indicates the presence of abundant oxygen.



  • Final


            Joey Troy
  • SH2-275, 


            Joey Troy


Description: This is my take on the Hubble Palette. Because I am using the L-eXtreme filter you can manipulate the image and create this with a one-shot color camera.

Uploaded: ...

Sky plot

Sky plot




            Joey Troy