• NGC 457 in Cassiopeia, The Owl Cluster
    • NGC457 in Cassiopeia, Owl Cluster
    Annotated image
  • NGC 457 is an open cluster with about 60 stars
  • identified as true members of the cluster
  • and with about 150 stars in the field.
  • Hover over the image for an annotated view.
  • Date:  31 July 2024 and 26 October 2025
  • FOV:  approximately 45' × 30'; the angular size of NGC 457 is about 13'
  • Telescope:  Stellarvue SVX102T + SFFX-1 flattener, 739.62mm, f/7.25
  • (nominally 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
  • Pixel size:  4.78 μm
  • Resolution:  1.333 arcsec/pixel
  • Frames:31 Jul 2444 × 240 seconds × 90 gain,
  • 26 Oct 2548 × 300 seconds × 90 gain
  • Filter:  Optolong UV-IR cut filter
  • Stacking:  ninety-two frames using Pixinsight
  • Calibration frames:  20 dark, 20 flat, 20 dark flat
  • Total Time:  6 hours and 56 minutes
  • Processing:  Pixinsight
  • SPCC, DBE, SPCC, BlurXT, NoiseXT,
  • HTS, GHS, MStr, PixelMath MStr + GHS + HST,
  • Sat, DynCrop
  • Location:  Darling Hill Observatory near Vesper, NY