Hemisphere:  Northern  ·  Constellation: Monoceros (Mon)  ·  Contains:  NGC 2239  ·  NGC 2244  ·  Rosette nebula  ·  The star 12Mon
Rosette Nebula (Ha + O3 + RGB), 


            Scott Davis
Rosette Nebula (Ha + O3 + RGB)
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Rosette Nebula (Ha + O3 + RGB)

Technical card

Imaging telescopes or lenses: Explore Scientific ED102 APO  ·  Canon EF 200mm f/2.8L II USM

Imaging cameras: Canon EOS Rebel T3i  ·  QSI 683ws-8

Mounts: Celestron CGEM Hypertuned

Guiding telescopes or lenses: Orion ShortTube 80

Guiding cameras: Orion StarShoot Autoguider

Focal reducers: Astro-Tech AT2FF

Software: Sequence Generator Pro  ·  DeepSkyStacker  ·  RegiStar  ·  Photoshop CS6

Filters: Astrodon 31mm Ha 3nm FWHM  ·  Astrodon 31mm OIII 3nm FWHM  ·  One-Shot Color

Accessory: Robofocus  ·  Home Made Peltier Cooler for T3i

Dates:Dec. 31, 2013Feb. 23, 2016Feb. 24, 2016Feb. 25, 2016Feb. 27, 2016

Astrodon 31mm Ha 3nm FWHM: 19x1200" (6h 20') -20C bin 1x1
Astrodon 31mm OIII 3nm FWHM: 29x1200" (9h 40') -20C bin 1x1
One-Shot Color: 59x180" (2h 57') ISO1600

Integration: 18h 57'

Darks: 28

Flats: 32

Flat darks: 32

Bias: 32

Avg. Moon age: 19.30 days

Avg. Moon phase: 74.38%

Bortle Dark-Sky Scale: 6.20

Basic astrometry details

Astrometry.net job: 982299

RA center: 06h31m55s

DEC center: +04°5714

Pixel scale: 3.025 arcsec/pixel

Orientation: -90.416 degrees

Field radius: 0.813 degrees

Resolution: 620x482

Locations: My Backyard, Clovis, California, United States; Ahwahnee Hills Observatory, Ahwahnee, California, United States


This is my first experiment in combining data captured using my new CCD camera setup with data captured using my old DSLR.

RGB data was captured using my Canon T3i and a 200mm lens. Narrowband data was captured using my ES 102 f/7 Refractor (714mm focal length) and my QSI 683 CCD camera.



  • Final
    Rosette Nebula (Ha + O3 + RGB), 


            Scott Davis
  • Rosette Nebula (Ha + O3 + RGB), 


            Scott Davis

Sky plot

Sky plot


Rosette Nebula (Ha + O3 + RGB), 


            Scott Davis