• NGC 3992 or Messier 109 in Ursa Major
    • M109
    Annotated image
  • Magnified View of Messier 109, also known as
  • the Vacuum Cleaner Galaxy.
  • Hover over the image for an annotated view.
  • Date:  21 March 2025
  • FOV:  approximately 30' × 20'
  • Telescope:  Orion 180mm Mak-Cass (2510mm, f/14, nominally 2700mm, f/15)
  • Guiding:  ZWO ASI120MM mini mono guide camera,
  • SVBony SV165 Mini 40mm f/4 guide scope
  • Computer:  ASIair pro Raspberry Pi
  • Mount:  iOptron CEM40
  • Camera:  ZWO ASI071MC Pro Cooled (-10°C) Color CMOS gain 90
  • Pixel size:  4.78 μm
  • Resolution:  0.393 arcsec/pixel
  • Filter:  none
  • Frames:  sixty-six 240 second subs
  • Total Time:  4 hours and 24 minutes
  • Calibration:  20 flats, 20 dark flats, and 20 darks
  • Processing:  Pixinsight – SPPC, DBE, SPCC, BlurXT, NoiseXT → Linear
  • MStr, GHS, HST, PMath MStr + GHS + HST → Stars, Sat,
  • StarXT, MStr, GHS, HST, PMath MStr + GHS + HST → Starless,
  • HDRMST465PhLm, Sat, PMath ~(~Stars*~Starless) → Blend, scale
  • Location:  Darling Hill Observatory near Vesper, NY