• NGC 2168 or Messier 35 in Gemini
    • M35
    Annotated image
  • M35, or NGC 2168, is a close (2970 ly) open cluster in Gemini.
  • M35 is so close to us that it can be seen with the naked eye.
  • It is a young cluster and therefore contains predominantly
  • hot, blue stars.  NGC 2158 is another open cluster in the
  • frame which is much farther from us (11 000+ ly)
  • and contains smaller, older, cooler, red stars.
  • Hold the shift key down for high color saturation.
  • Hover over the picture for an annotated version
  • Date:  3, 17, and 18 March 2025
  • FOV:  cropped to 70' × 46' 40"; angular size of M35 is 28'
  • 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:  none
  • Stacking:  seventy-four 240 second frames using PixInsight
  • Total Time:  4 hours 56 minutes
  • Calibration:  20 flats, 20 dark flats, and 20 darks per session
  • Processing:  Pixinsight – DynCrop, SPCC, DBE, SPCC, BlurXT, NoiseXT,
  • HST, GHS, MStr, PixelMath MStr + GHS + HTS → Final, Sat
  • Location:  Kopernik Observatory near Vestal, NY, 3 March 2025,
  • Stony Creek Boat Launch near Henderson, NY, 17 March 2025,
  • and Darling Hill Observatory near Vesper, NY, 18 March 2025