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QSI 520 -

NGC 6946 Spiral Galaxy and NGC 6939 Open Star Cluster

Bright Objects Information
Objects in image from top to bottom

• Constellation: Cepheus
• NGC 6939 Open Star Cluster
  • SEDS NGC 6939
  • NGC 6939 in NASA/IPAC Extragalactic database
• NGC 6946 Spiral Galaxy
  • SEDS NGC 6946
  • Wikipedia NGC 6946
  • NGC 6946 in NASA/IPAC Extragalactic database, Magnitude: 9.61
  • Astronomy Picture of the Day Facing NGC 6946 2008 August 15
  • Astronomy Picture of the Day NGC 6946: The Fireworks Galaxy 2005 January 25
  • Astronomy Picture of the Day Facing NGC 6946 2004 April 10

Faint Objects Information
Objects in image from top to bottom

• VII Zw 934 or PGC 064702 in NASA/IPAC Extragalactic database, magnitude: 18.8
• PGC 064824 in NASA/IPAC Extragalactic database, magnitude: 17
• PGC 064878 in NASA/IPAC Extragalactic database, magnitude: 18.5

Image Information

• Field of view: 115.7 arcminutes wide x 86.8 arcminutes high at 4.34 arcsec/pix
• Image reduced from 1600x1200 to 1200x900 for website
• North is top and west is left
• Exposure: 10 images x 480 seconds per image (80 minutes total)
• CCD-TEMP: -25°C
• Astronomik Type IIc Luminance filter
• Guided

Observing Information

• OBS-Location: Camp Hancock Star Party (John Day Fossil Beds Nat'l Monument) east of Clarno, OR USA
• DATE-Local = September 27-28, 2008
• TIME-Local of first image = 11:20 PM
• TIME-Local of last image = 12:34 AM

Imaging Equipment

• QSI 520 CCD Camera on Pentax 75mm SDHF APO Refractor

Imaging Processing

• AIP4WIN V2.2
• Diffraction Limited MaxIm DL V5.04
• Adobe Photoshop CS3 10.0.1
• Noel Carboni Photoshop Astronomy Tools V1.5

Monitor Test Pattern

The following test pattern is to help you adjust your monitor to best view the CCD astro images. The test pattern is used for adjusting monitor brightness, and contrast. Adjust monitor brightness and contrast to see all 16 gray scale levels. The most important adjustment when viewing astro images is to see the differences in all of the black bands.

© 1998-2008 David Haworth