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QSI 520 -

Perseus Double Cluster NGC884 and NGC869

Objects Information
Objects in image from left to right

• Constellation: Perseus
• Open Cluster NGC 884
• Open Cluster NGC 869
  • SEDS NGC 869 and NGC 884
  • Wikipedia Double Cluster, NGC 884 and NGC 869
  • Astronomy Picture of the Day NGC 869 & NGC 884: A Double Open Cluster
  • Astronomy Picture of the Day Double Cluster in Perseus

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: 7 images x 480 seconds per image (56 minutes total)
• CCD-TEMP: -30°C
• Astronomik Type IIc Luminance filter
• Guided

Observing Information

• OBS-Location: Oregon Star Party (OSP), OR USA
• DATE-Local = August 31, 2008
• TIME-Local of first image = 1:45 AM
• TIME-Local of last image = 2:35 AM

Imaging Equipment

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

Imaging Processing

• AIP4WIN V2.2
• Diffraction Limited MaxIm DL V5.02
• 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