Description

The Rosette Nebula is a large nebula in Monoceros consisting of an open star cluster and a large surrounding emission nebula.
Although the nebula is usually referred to as NGC 2244, this is actually the designation for the open cluster.
The open cluster is estimated to be only about 5 million years old.

The nebula itself is cataloged under NGC 2237. The distance to the nebula is about 5.200 light years.

Previous/older images:

Feb 11, 2008 – Canon 350D (80mm TMB-7h)

Image data

Object info
Name NGC2244 – The Rosette Nebula
Type Emission nebula
Constellation Monoceros
Right ascension 06h 31m 54s
Declination +04° 56′ 00″
Distance 5.200 ly
Other designations Caldwell 50
Image info
Image date Dec. 06, 2016
Light frames 18x 4 min. RGB (each) unbinned, 12x 10 min. 7nm Ha unbinned (Luminance)
Total integration 3h 36m
Dark frames 20x
Flat frames 20x p. filter unbinned, created with an A3 size Posterpoweruk flatfield panel
Bias frames 20x
Software used SGPro, PHD2 Guiding, DeepSkyStacker, Registar, Photoshop CS6
Processing Focusing and image acquisition was done using Sequence Generator Pro.
All separate frames were calibrated, aligned and stacked in DeepSkyStacker.
Images were aligned in Registar prior to combining into RGB.
Photoshop CS6 was used for further processing – curves adjustment, levels adjustment, etc.
Noel Carboni’s toolset was used as well (Local Contrast Enhancement, Deep Space Noise Reduction)
Equipment info
Telescope TMB/LOMO 80/480
Corrector Televue 2″ TRF 2008 flattener/reducer (FL: 384mm f/4.8)
Mount Losmandy G-11 Gemini
Camera SBIG ST-8300M
Guide camera Astrolumina ALccd5-II (Mono)
Guide scope Starwave 50mm f/4.1 Guide Scope
Autoguide software PHD2 Guiding
Filters Baader 2″ 7nm Ha, Baader 2″ RGB + IDAS LPS-P2
Location Landgraaf, The Netherlands
Image comments

Imaging conditions were not good.
Cold winter nights, with slight snow cover, no wind and high humidity.

Took 30 frames of each 10 minutes Ha, but in the end only 12 were usable.