Focal Pointe Observatory
Astrophotography by Bob Franke

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NGC 2523   (ARP 9)

 

Click the image for a larger FOV. (2610 x 1728 1.03 MB)

Instrument

12.5" RCOS @  ~f/9 (2880 mm fl) at 0.64 arcsec/pixel. Shown at 0.86 arcsec/pixel.

Mount

Paramount ME

Camera

SBIG STL-11000 w/ FW8-STL filter wheel, AstroDon Gen II LRGB Filters.

Acquisition Data

2/25/2012 to 3/24/2012 Chino Valley, AZ... with CCDAutoPilot5 & CCDSoft.  AOL guided.

Exposure

 Lum 390 min. (13 x 30 min. bin 1x1)

RGB

405 min. ( 9 x 15 min. each bin (2x2)

RGB ratios are 1.00, 0.97 & 1.09

Software

  • CCDSoft, CCDStack, Photoshop CS6, PixInsight and Noel Carboni's actions.

  • A standard image-train calibration was used, as determined by eXcalibrator v4.30, and then adjusted for altitude extinction.

  • CCDBand-Aid to repair KAI-11000M vertical bars.

  • CCDStack to calibrate all sub exposures, register and stack the color and create the RGB image.

  • PixInsight processing includes registering and stacking the luminance, gradient repair, non-linear stretching with HistogramTransformation, HDRMultiscaleTransform and LRGB creation.

  • PhotoShop for the final touch-up. 

  • Noiseware 5, a PhotoShop plug-in.

Comment

The galaxy is shown rotated 45 clockwise.

NGC 2523 is a barred spiral galaxy at a distance of about 155 million light-years towards the constellation Camelopardalis. Edward Swift discovered the galaxy in 1885.

The galaxy is also item number 9 in the Arp catalog and is described as a spiral galaxy with split arms. One of the two main arms, that would form a grand design pattern, branches into two narrow arms. NGC 2523 also has a remarkably prominent inner ring that just encloses the 47 kly long bar.