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Click for 60% full size image

         

Dates & Location

9th -15th November 2009 using the SMAP site at Weed, New Mexico. Elevation 7269 ft. Lat 32.8°N Long 195.5W  

Catalogue identification

NGC 772 Irregular spiral galaxy.
Arp 78 Catalogue of peculiar galaxies.

Equipment Used

Officina Stellare RC400 at 3304mm focal length.
Paramount ME German equatorial Mount.
Camera SBIG ST-11000M with FW-8L filter wheel.
TheSky V6 telescope control.
CCDSoft V 5.0 camera control
.

 

Where it is in space

NGC 772 is a type-Sb, spiral galaxy in the constellation Aries. It has a visual magnitude of 10.3 and is about 7.2 x 4.3 arc minutes in apparent size. In this image, North is up and East is to the left.
Acquisition

Remote session using RADMIN PC control from Ravenshead, UK.
LRGB exposures:- 250:90:90:130 mins total using 10 min sub-exposures at
-25°C. All images binned 1x1. AllC

  What it is

NGC 772 is a gravitationally distorted barred spiral galaxy at a distance of about 100 million light years from our galaxy. The small elliptical galaxy just below and right of its centre is NGC 770 and appears to be interacting with NGC 772, distorting the spiral structure and there is evidence on this image that this gravitational pull has drawn out a stream of stars, dust and gas well beyond NGC 770 itself. In the full size image the faint remnants of these streams can be seen quite clearly, but they are much fainter and more attenuated than the main spiral structure. They extend past the elliptical galaxy and then can be seen to flow below NGC 772 itself and to the left (East).

Processing Methods

Image acquisition and telescope control with CCDSoft V5.  
  Data reduction and Luminence De-convolution with CCDStack. RGB colour channels prepared in CCDStack.  
 

Master RGB image and Master Lum Image finished with Photoshop CS2.Final LRGB image using PhotoShop CS2.