• Goblet of Fire Nebula in Triangulum
    • Goblet of Fire
    Goblet of Fire annotated
  • StDr56, PN‑G 141.8‑29.9, or the Goblet of Fire Nebula in
  • Triangulum is a large but faint planetary nebula.
  • Hover over the picture for an annotated version
  • Date:  6 October 2026
  • FOV:  100' × 66' 40", the angular size of
  • the goblet is about 44' x 36'
  • Rotation:  −179.184°
  • Telescopes:  Celestron 9.25" EdgeHD SCT (nominally 2350mm, f/10
  • with a Starizona HyperStar, 514.8mm, f/2.19) and a
  • Stellarvue SVX102T refractor (nominally 714mm, f/7
  • calculated 735.87mm, f/7.21)
  • Guiding:  ZWO ASI120MM mini mono guide cameras,
  • SVBony SV165 Mini 40mm f/4 guide scopes
  • Computer:  ASIair plus and ASIair 256G
  • Mounts:  ZWO AM7 and AM5 harmonic drives
  • Cameras:  ZWO ASI6200mc and ASI2600mc, both 100 gain and -10°C
  • Pixel size:  both are 3.76 μm
  • Resolution:  1.462 (C925) and 1.054 (SVXT) arcsec/pixel
  • Frames:  82 × 300 seconds, Optolong L-Para filter (C925)
  • 84 × 300 seconds, Optolong UV/IR cut filter (SVXT)
  • Total Time:  13 hours 50 minutes
  • Processing:  Pixinsight
  • preprocessing → L-Para×82 and UV/IR×84
  • L-Para:  MGC, DBE, SPCC, BXT, NXT, StarXT → LinearL-Para
  • UV/IR:  MGC, DBE, SPCC, BXT, NXT → LinearUVIR
  • LinearUVIR:  StarXT → LinearUVIR_StarXT
  • LinearUVIR:  MultiAdaptiveStretch → Stars
  • PixelMath ~(~LinearL-Para*~LinearUVIR_StarXT) →
  • LinearStarless, HTS, GHS, MStr, MAS,
  • PixelMath 0.25*(HTS + GHS + MStr + MAS) → Starless
  • PixelMath ~(~Stars*~Starless), DynCrop/Scale
  • Location:  Darling Hill Observatory near Vesper, NY