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Contains:  NGC 2239, NGC 2244, Rosette nebula, The star 12Mon
Getting plate-solving status, please wait...
Rosette Nebula Core: Bi-Color, 


            Joel Shepherd
Rosette Nebula Core: Bi-Color
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Rosette Nebula Core: Bi-Color

Technical card

Dates:Dec. 30, 2015Jan. 1, 2016

Orion H‑Alpha 7nm 1.25": 26x300" bin 1x1
Baader Planetarium OIII 1.25" 8.5nm: 18x300" bin 1x1

Integration: 3.7 hours

Avg. Moon age: 20.60 days

Avg. Moon phase: 65.88%

Bortle Dark-Sky Scale: 6.00

Basic astrometry details job: 1152240

RA center: 6h 31' 39"

DEC center: +5° 1' 40"

Pixel scale: 2.488 arcsec/pixel

Orientation: 127.266 degrees

Field radius: 0.562 degrees

Resolution: 1280x1002

Locations: Home, Seattle, WA, United States


Updated 10 July 2016: I reprocessed this from the raw lights. Did noise reduction a little differently, and used a different combination. I'm actually not sure what the original combination was, but this is R: Ha, G: 0.25Ha + 0.75OIII, B: OIII. Also tried to remove some of the blue fringe on the stars and -- perhaps too much so -- some blue haze that seemed excessive.

Original: This image has a lot of technical issues -- insufficient FOV, unreal blue-green tinge to the stars, probably because the O-iii filter I used was for visual, not imaging, and so on -- but I don't care. It's my first color AP image, and narrowband at that. Very excited about where this could lead.



Joel Shepherd
License: Attribution Creative Commons


  • Rosette Nebula Core: Bi-Color, 


            Joel Shepherd
  • Final
    Rosette Nebula Core: Bi-Color, 


            Joel Shepherd

Sky plot

Sky plot


Rosette Nebula Core: Bi-Color, 


            Joel Shepherd