• LBN 535, The Dark Shark Nebula
    • LBN 535
    LBN 535 Annotated image
  • The Dark Shark Nebula is a very faint dark nebula in Cepheus.
  • Hover over the picture for an annotated version
  • Date:  14 and 19 July 2023
  • FOV:  approximately 4° 30' × 3°; LBN 535 (the shark) is about 2° 30'
  • Telescope:  Askar FRA300 pro (300mm f/5 Petzval)
  • Guiding:  ZWO ASI120MM mini mono guide camera,
  • SVBony SV165 Mini 40mm f/4 guide scope
  • Computer:  ASIair proRaspberry Pi
  • Mount:  ZWO AM5 mount
  • Camera:  ZWO ASI6200MC Pro Cooled (-10°C) Color CMOS
  • Pixel size:  3.76 μm
  • Resolution:  2.596 arcsec/pixel
  • Filter:  in camera UV/IR cut
  • Stacking:  eighty-seven frames using Pixinsight
  • sixteen frames 0 gain 14 July 2023
  • seventy-one frames 100 gain 19 July 2023
  • Total Time:  5 hours 48 minutes
  • Calibration:  20 darks, 20 flats, 20 dark flats
  • Processing:  Pixinsight – SPCC, DBE, SPCC, BlurXT, NoiseXT → Linear
  • MStr, GHS, HST, PMath MStr + GHS + HST → Stars, Sat,
  • StarXT, MStr, GHS, HST, PMath MStr + GHS + HST → Starless, Sat,
  • PMath ~(~Stars*~Starless) → Blend, scale
  • Location:  Stony Creek Boat Launch near Henderson, NY 14 July 2023
  • and Darling Hill Observatory near Vesper, NY July 19 2023