• Collinder 399 in Vulpecula
    • The Coathanger in Vulpecula
    Annotated image
  • Cr 399, Collinder 399, Brocchi's Cluster, or the
  • Coathanger asterism is an optical grouping
  • of stars, but is not a star cluster.
  • Hover over the picture for an annotated version
  • Date:  27 August 2025
  • FOV:  cropped to 135' × 90'; angular size of Cr 399 is about 60'
  • 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 ASI6200MC Pro Cooled (-10°C) color CMOS
  • in full frame mode with gain 100
  • Filter:  Optolong UV/IR
  • Stacking:  twenty-nine 240 second frames using PixInsight
  • Calibration:  20 dark, 20 flat, 20 dark flat
  • Total Time:  1 hour 54 minutes
  • Processing:  Pixinsight – SPCC, DBE, SPCC, BlurXT, NoiseXT,
  • GHS, HST, MStr, PMath GHS + HST + MStr, Sat, DynCrop/Scale
  • Location:  Darling Hill Observatory near Vesper, NY