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Dates & Location

1st - 7th March 2011 using the SMAP site at Weed, New Mexico. Elevation 7269 ft. Lat 32.8°N Long 195.5W  

Catalogue identification

NGC 4236
PGC 39346

Equipment Used

Officina Stellare RC400 at 3278mm focal length, F8.2.
Paramount ME German equatorial Mount.
Camera SBIG ST-11000M with FW-5L filter wheel.
TheSky V6 telescope control.
CCDSoft V 5.0 camera control.
ScopeDome remote observatory.


Where it is in space

In the constellation of Draco. NGC 4236 has an integrated magnitude of 10.1 but its apparent visual size is very large at 22.9 x 7.7 arc minutes which is 2/3 the diameter of the Moon. It is located about 1.5 degrees WSW of the star Kappa Draconis. In this image North is up.

Remote session using RADMIN PC control from Ravenshead, UK.
Exposures: 15 x 20min Luminance:110:90:110 mins R:G:B, using 10 min sub-exposures
-25°C. All images binned 1x1. AllC

  What it is

NGC 4236 is a barred spiral galaxy seen from a near edge-on viewpoint. The principal srtuctures visible in this image are the central bar and the extensive blue star forming regions. Its red emission regions which normally can be seen in spiral galaxies of this type are very small in comparison and can only be glimpsed in the highest resolution image which can be seen by clicking on the image above. It is estimated to be 11.7 million light years from us and may be a part of the Local Group which includes our own Milky Way galaxy or it may be a part of the M81 group.

Processing Methods

Image acquisition and telescope control with CCDSoft V5/ TheSky6.  
  Data reduction with CCDStack. Lum and RGB masters prepared and in CCDStack.  

Final RGB combine and LRGB processing using PhotoShop CS2.