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|Description:||Called the Dumbbell nebula because of its
visual appearance, this planetary nebula is the brightest in the sky.
The central star is a bright blue dwarf. The outer shell shows up
primarily in Ha filtering with a considerable OIII component.
|Exposure Data:||9/4-12/2008. LRGBHaOIII: 18x10m, 4x20m,
4x20m, 4x20m, 9x20m, 23x15m, all 1x1 except OIII binned 2x2. -15°C, 0.5 arc-sec./pixel. 15.75 hours total
|Processing:||Acquired via CCDAutoPilot and CCDSoft or Maxim,
calibrated and combined in CCDStack, final processing in PS CS3.
|Optical System:||16” Ritchey-Chretien @ F/9 w/FFC,
Apogee Alta U16M/FW50-7S CCD
camera, AstroDon filters, Paramount
ME, dithered 3 pixels, off-axis guided with SBIG ST-402ME.
|Comments:||Total exposure was almost 16 hours.
Thanks to Ken Crawford for many processing tips.