• Dark Nebulae LBN 535 and LBN 558
    • LBN 535
    LBN 535 Annotated image
  • The Dark Shark Nebula, LBN 535, and
  • the Rotten FIsh Nebula, LBN 558,
  • are two dark nebulae in Cepheus.
  • Hover over the picture for an annotated version
  • Date:  26 August and 4 September 2024
  • FOV:  approximately 6° 18' × 4° 12'; 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 (20°C) Color CMOS with gain 100
  • Pixel size:  3.76 μm
  • Resolution:  2.596 arcsec/pixel
  • Filter:  none 26 Aug and Optolong UV-IR on 4 September
  • Frames:  26 August202460 × 240 seconds,
  • 4 September 202483 × 240 seconds
  • Stacking:  one hundred forty three 240 second frames using Pixinsight
  • Total Time:  9 hours 32 minutes
  • Processing:  Pixinsight – SPCC, DBE, SPCC, BlurXT, NoiseXT,
  • HST, GHS, MStr, PixelMath MStr + GHS + HST → PM,
  • PM → StarXT (RC Astro) → Stars and Starless,
  • Starless → HDR9i, PixelMath ~(~Stars*~Starless) → Blend,
  • RangeSelection → StarMask, Masked Sat, Scale
  • Location:  Darling Hill Observatory near Vesper, NY