Object  Ngc 6872 & companions

Ngc 6872 is an interesting galaxys located in the southern constellation Pavo (The Peacock). It is comparatively distant, almost 300 million light-years away. It extends over more than 7 arcmin in the sky and its real size from tip to tip is thus nearly 750,000 light-years. It is in fact one of the largest known, barred spiral galaxies. It is of type SBb and is accompanied by a smaller, interacting galaxy, IC 4970 of type S0shown above in this image. The galaxy's elongated shape might have something to do with its continuing collision with the smaller galaxy IC 4970. Of particular interest is NGC 6872's spiral arm on the upper left,  which exhibits an unusually high amount of blue star forming regions.
The light we see today left these colliding giants before the days of the dinosaurs, about 300 million years ago.

 Also of note is the larger elliptic galaxy Ngc 6876 (below left from Ngc6872), next from the left of this is Ngc 6877, also an ellip[tic galaxy. Further to the left, Ngc 6880, a spiral galaxy & Ic 4981, an irregular galaxy.

Date Lum- 23 08/ 11  & RGB  29 / 08/ 11
Location BayTop Observatory- Streaky Bay South Australia
Instrument Home built 10" Newtonian (Bob Royce primary) and an Antares 1/20th wave secondary with Televue Paracorr coma corrector. System working @ f4.6 (native F4/ 1016 FL)  1.315 arcsec/pixel- FOV  aprox 44.6x44.6
Mount Celestron CI700 controlled by the SiTech servo Goto Control System with Pittman 8000 series motors. Pulley and belt system
Camera (CCD) Starlight Xpress SXVR-H16 monochrome with Starlight Xpress USB filter wheel.
Exposures L: 126' R: 49' G: 49 B: 49'  (7min sub exposures all unbinned)     Flat field and bias frames subtracted.
Guiding   SX OAG with a Starlight Xpress Lodestar guide cam.
Filters Astronomik typeII anti halo L (clear) RGB 2" filter set
Notes/ Conditions

 Conditions- Average seeing and transparency when taking the lum. When taking the colour set, the evening had exceptional seeing and transparency.  FWHM's were very low!