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Contains:  NGC 2244, Rosette nebula, NGC 2239, The star 12Mon
Getting plate-solving status, please wait...
Caldwell 49 - Rosette Nebula, 


            Bruce Rohrlach
Caldwell 49 - Rosette Nebula

Caldwell 49 - Rosette Nebula

Technical card

Resolution: 10000x7081

Dates:March 25, 2018

ZWO Ha 36mm: 220x30" (gain: 300.00) -10C bin 1x1
ZWO OIII 36mm: 220x30" (gain: 300.00) bin 1x1
ZWO SII 36mm: 160x30" (gain: 300.00) bin 1x1

Integration: 5.0 hours

Darks: ~40

Bias: ~40

Avg. Moon age: 8.29 days

Avg. Moon phase: 59.64% job: 2099400

RA center: 97.938 degrees

DEC center: 4.986 degrees

Pixel scale: 0.323 arcsec/pixel

Orientation: 126.974 degrees

Field radius: 0.549 degrees

Locations: Boronia, Melbourne, Victoria, Australia

Data source: Backyard


The Rosette Nebula (AKA Caldwell Object 49) in the constellation of Monoceros as it looks with 5 hours of integrated exposure through narrowband filters (Hydrogen Alpha, Oxygen OIII and Sulphur SII) over 2 nights with the sensitive ASI1600mm Pro.
220 x 30sec Ha, 220 x 30sec OIII, 160 x 30 sec SII.

The next step is to get my Off Axis Guider working, it has been attached for a couple months now but not yet in use.

This is the central core of the Rosette Nebula, located about 5000 LY from earth. The entire nebula is around 5 times the visual area of the full moon. An array of dark Bok globules (dense dark pillar-like aggregations of cold gas and dust within which stars are condensing) occur around the left of the central gas-depleted core of the nebula, and an inflating ionised gas bubble can be seen just left of the brightest star, where gases are being blown out by the stellar wind emanating from several internal O-type stars.



Bruce Rohrlach
License: None (All rights reserved)

Sky plot

Sky plot


Caldwell 49 - Rosette Nebula, 


            Bruce Rohrlach