From Wikipedia
The Rosette Nebula (also known as Caldwell 49) is an H II region located near one end of a giant molecular cloud in the Monoceros region of the Milky Way Galaxy. The open cluster NGC 2244 (Caldwell 50) is closely associated with the nebulosity, the stars of the cluster having been formed from the nebula's matter.

The complex has the following New General Catalogue (NGC) designations:

NGC 2237 – Part of the nebulous region (Also used to denote whole nebula)
NGC 2238 – Part of the nebulous region
NGC 2239 – Part of the nebulous region (Discovered by John Herschel)
NGC 2244 – The open cluster within the nebula (Discovered by John Flamsteed in 1690)[citation needed]
NGC 2246 – Part of the nebulous region

The cluster and nebula lie at a distance of 5,000 light-years from Earth[3]) and measure roughly 130 light years in diameter. The radiation from the young stars excites the atoms in the nebula, causing them to emit radiation themselves producing the emission nebula we see. The mass of the nebula is estimated to be around 10,000 solar masses.

A survey of the nebula with the Chandra X-ray Observatory has revealed the presence of numerous new-born stars inside optical Rosette Nebula and studded within a dense molecular cloud. Altogether, approximately 2500 young stars lie in this star-forming complex, including the massive O-type stars HD 46223 and HD 46150, which are primarily responsible for blowing the ionized bubble.[4][5] Most of the ongoing star-formation activity is occurring in the dense molecular cloud to the south east of the bubble.[6]

A diffuse X-ray glow is also seen between the stars in the bubble, which has been attributed to a super-hot plasma with temperatures ranging from 1 to 10 million K.[7] This is significantly hotter than the 10,000 K plasmas seen in HII regions, and is likely attributed to the shock-heated winds from the massive O-type stars.



Telescope: William Optics FLT132

Camera: QHY9 Mono @ -20c

Filter Wheel: QHY 7 position Ultra Slim

Filters: QHY 36mm unmounted L R G B, Baader 36mm unmounted HA OIII SII

Guidng: QHY OAG

Guide Camera: QHY5L-II

Mount: AZ-EQ6

Mount Control: EQASCOM

Focusing: SharpSky Pro and Sequence Generator Pro 3 (automated)

Capture Software: Sequence Generator Pro 3

Guiding Software: PHD2

Calibration and Stacking Software: PixInsight

Processing Software: PixInsight

Number and Type of Data Frames: L= X min, R= x min, G= x min,
B= x min

4 panel Mosaic

Ha= 4x15min, SII= x min, OIII= 4x15min per panel.

Binning: 1x1

Total Image Time: 8 hrs

Location: Lockleys Observatory B, Tanunda, Sth Australia

Light Box by Exfso