Rosette Nebula – NGC 2244

Rosette Nebula – NGC 2244

The Rosette was my first ever astrophotography image, so I always enjoy coming back to this target and capturing it.  It’s bright, it’s easy, and it’s full of color.  Located in the constellation Monoceros, sits about 5000 lightyears away from us.  It is anywhere from 120-140 lightyears across in diameter.

The Rosette is an emissions nebula, which just means the bright radiation from the young stars, most likely in the center region, excite the atoms in the nebula which makes them emit radiation themselves… such as Ha, Oiii, Sii signal that we capture in the telescope.

Telescope: Celestron RASA 8 (400mm focal @ f/2)
Filters:  Baader Ultra-Highspeed F/2 3.5nm & 4nm Filters.
Main Camera:  ZWO ASI 1600mm-pro Monochrome
Mount:  Skywatcher EQ6r-Pro
Guide Scope:  William Optics 50mm Uniguide
Guide Camera:  ZWO ASI 290mm-mini

Location:  Pendleton, Oregon
Observatory:  NexDome 2.4m Automated
Bortle:  3-4
Long & Lat:  45.67N, -118.79 W

Ha: 118×60″
Oiii Filter
: 38×60″
Sii Filter: 80×60″
Calibration Bias: 40
Calibration Dark: 20
Calibration Flat: 20

Integration Time:  ~4.5 hours total
Gain:  139 (unity)
Cooling:  -20
Processing Software
:   Astro Pixel Processor, StarXTerminator, NINA, PHD2, Photoshop CC