The Tulip Nebula (Sh2-101) in Narrowband

Another image from the recent stretch of clear nights we had. The Tulip is a surprisingly difficult object to process. There is a lot going on in H-alpha, but not a lot of distinct edges, and the background is a soup of ionized gas. In retrospect, I would have framed this image differently, but once I had one night of good data, I didn’t want to start over. Clear nights are precious here in the Northeast!

  • Exposures (all at gain=200, -15ºC):
    • H-alpha 56×300s
    • SII 51×300s
    • OIII 52×300s
    • Total exposure time:  13 hours 15 minutes
    • Taken nights of 6/6-6/9 from Doylestown, PA
  • Telescope: AstroTech AT8RC with AP CCDT67 reducer (effective f/5 1000 mm)
  • Camera: ZWO ASI1600MM-Pro with Baader 36 mm filters
  • Mount: Takahashi EM-200
  • Guiding: Orion Starshoot Autoguider on 50 mm finder scope
  • Processing: PixInsight

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