2024 Michael A. Siniscalchi

What's New



Odds n Ends

        Rosette Nebula
     Emission Nebula  in Monoceros
          RA 06h 33m 40s  Dec: +04 59' 50" Distance ~5200 ly


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.

Click on image for full size

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

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