Focal Pointe Observatory
Astrophotography by Bob Franke

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Arp-104


      Click the full screen zoom button           ^
     
Click the image to Zoom and Pan              

Click here to view the image without Zoomify (4008 x 2672, 1,353 KB)

 

 

Instrument

12.5" RCOS @  ~f/9 (2880 mm fl) 0.64 arcsec / pixel.  The Zoomify image scale is 0.64 to 3.58 arcsec / pixel.

Mount

Paramount ME

Camera

SBIG STL-11000 w/ internal filter wheel, AstroDon Gen II Filters

Acquisition Data

3/15/2012 to 3/28/2012 Chino Valley, AZ... with CCDAutoPilot3 & CCDSoft.  AOL guided

Exposure

Lum  570 min. (19 x 30 min. bin 1x1)

RGB  495 min. (11 x 15 min. each, bin 2x2)

Software

  • CCDSoft, CCDStack, Photoshop CS w/ the Fits Liberator plugin, Noel Carboni's actions and and Russell Croman's GradientXTerminator.

  • eXcalibrator 3.0 beta (g-r) color balancing, using 90 stars from the SDSS-DR7 database.

  • PixFix32 (pre-beta) to repair column defects.

  • CCDStack to calibrate, register, normalize, data reject, combine the sub exposures, selective deconvolution and the RGB color image.

  • PhotoShop for on-linear stretching and LRGB combine.

  • Noiseware Pro, a PhotoShop plug-in.

Comment

South is ~ to the top.  The image is rotated 135 CW

 

Arp 104 (NGC 5219 and 5218) was first noted by William Herschel in 1790. However at that early date, the two galaxies were thought to be nebulae. The interacting pair of galaxies is located in the constellation Ursa Major at a distance of about 17 million light-years. The connecting string of gas, dust and stars is about 22,000 light-years long.

The image also contains 2290 background galaxies down to magnitude 22.5, with many even fainter visible. Also of interest are 13 QSO's. The most distant is at about 12.8 billion light-years, with a redshift of 3.52.