NGC2237 - Rosetta Nebula  
Monoceros

H-alpha picture of this large, circular HII region located near one end of a giant molecular cloud in our galaxy		  
 
The open cluster NGC 2244 is closely associated with the nebulosity, the stars of the cluster having been formed from the nebula's matter.

The complex has the following NGC designations:

* NGC 2237 - Part of the nebulous region (Usually 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)
* NGC 2246 - Part of the nebulous region

The cluster and nebula lie at a distance of some 5,200 light years from Earth (although estimates of the distance vary considerably) and measure roughly 130 light years in diameter. The radiation from the young stars excite 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.

It is believed that stellar winds from a group of O and B stars are exerting pressure on interstellar clouds to cause compression, followed by star formation in the nebula. This star formation is currently still ongoing.

A survey of the nebula with the Chandra X-ray Observatory in 2001 has revealed the presence of very hot, young stars at the core of the Rosette Nebula. These stars have heated the surrounding gas to a temperature in the order of 6 million kelvins causing them to emit copious amounts of X-rays.

This picture shows the central nucleous of Rosetta Nebula though an Ha filter.		  
 
Technical details:  
Location:  
 Valdemorillo - Spain
Date:  
 04/01/2009 (dd/mm/yyyy)
Conditions:  
 Normal
Temperature:  
 -2ºC
Humidity:  
 high
 
Telescope:  
 GSO Reflector 200mm f/4
Reducer/corrector:  
 Baader MPCC
Filter:  
 Baader Ha 7nm 2"
Mount:  
 Vixen GPD2 Autostar Meade
Camera:  
 Canon 350D no filter
Exposure:  
 3x900s@800iso
Guiding tube:  
 B&C 60/350 f7
Guiding camera:  
 Meade DSI Pro
Guiding software:  
 MaximDL
 
Procesing:  
 Combine, align and processing. Levels, curves and NR.  
Notes:  
  
     

 
All Contents Copyright by Jaime Fernández and Copyright of their respectives owners. Text mainly extracted from Wikipedia.
All Jaime Fernandez propietary contents freely available for non-profit purposes,
otherwise I beg you for a fair contribution to NGO Medicos Sin Fronteras proportional to the profit obtained.

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