• Messier 33 in Triangulum, the Pinwheel Galaxy
    • M33 in Triangulum, the Pinwheel Galaxy
    M33 in Triangulum, annotated
  • NGC598, M33, or the Pinwheel Galaxy in Triangulum
  • is the third largest galaxy in the Local Group.
  • M33 contains 40 billion stars and is 3.2 Mly from us.
  • Hover over the picture for an annotated version
  • Date:  15 October 2025
  • FOV:  approximately 108' × 72'; the angular size of M33 is 70.8' × 41.7'
  • Telescope:  Stellarvue SVX102T + SFFX-1 flattener (714mm, f/7)
  • Guiding:  ZWO ASI120MM mini mono guide camera,
  • Stellarvue F050G 50mm guide scope
  • Computer:  ASIair pro Raspberry Pi
  • Mount:  ZWO AM5
  • Camera:  ZWO ASI071MC Pro Cooled (-10°C) Color CMOS with gain 90
  • Filter:  Optolong UV/IR cut
  • Stacking:  fifty-five 300 second frames using PixInsight
  • Total Time:  4 hours and 35 minutes
  • Processing:  Pixinsight – SPPC, DBE, SPCC, BXT, NXT → Linear
  • MStr, GHS, HST, PMath MStr + GHS + HST → Stars, Sat,
  • StarXT, MStr, GHS, HST, PMath MStr + GHS + HST → Starless,
  • HDR68PhLm, Sat, PMath ~(~Stars*~Starless) → Blend, scale
  • Location:  Darling Hill Observatory near Vesper, NY