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 cluster and nebula lie at a distance of 5,000 light-years from Earth 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 blue bubble. Most of the ongoing star-formation activity is occurring in the dense molecular cloud to the south east of the bubble.

Location & Date	Backyard, Abbott Observatory- Long Island, NY,  Dec. 21-22, 2023
Telescope	Askar FRA400 F/5.5 Quintuplet Petzval Astrograph, ZWO focuser, iOptron GEM45G mount Image scale 1.93 arcsec/pixel
Camera	Player One Poseidon-M Pro Antlia  Ha (4.5nm) & SII OIII 3nm Pro filters Sensor temp -15°C
Exposures	Ha-12x5m SII-18x5m OIII-15x5m Bin 1x1  Gain=0 Offset=20
Planning & Acquisition	Sequence Generator Pro
Processing	Astro Pixel Processor - calibration, stacking Photoshop  2024 - HSO combine RC-Astro- Star xTerminator, Noise xTerminator

Initial stretch of 1 hour of Hydrogen Alpha (Ha) taken with Antlia 4.5nm filter.

Initial stretch of 1 1/2 hours of Sulfur (SII) taken with Antlia 3nm filter

Initial stretch of 1.25 hours of Oxygen (OIII) taken with Antlia 3nm filter