• NGC 772, Arp 78, in Aries
    • Arp 78
    Arp 78, NGC 772, annotated
  • NGC 772, part of Arp 78, in Aries is a large, unbarred
  • spiral galaxy.  The Arp designation means it was
  • included in Halton Arp's Atlas of Peguliar
  • Galaxies (1966).  Objects in Arp's atlas
  • include single peculiar galaxies, those
  • with unusual features, or, in this
  • case, interacting galaxies.
  • NGC 772 is 106 Mly from us.
  • Hover over the picture for an annotated version
  • Date:  6 October 2026
  • FOV:  approximately 20' × 13' 20"; the angular size of
  • NGC 772 is 7.2' × 4.3'
  • Rotation:  179.993°
  • Telescope:  SVBony MK127 Mak-Cass (nominally 1500mm, f/11.8
  • calculated 1421.06mm, f/11.2)
  • Guiding:  ZWO ASI120MM mini mono guide cameras,
  • SVBony SV165 Mini 40mm f/4 guide scopes
  • Computer:  ASIair plus and ASIair 256G
  • Mount:  ZWO AM5 harmonic drive
  • Camera:  ZWO ASI071mc 90 gain (-10°C)
  • Pixel size:  4.78 μm
  • Resolution:  0.693 arcsec/pixel
  • Filter:  Optolong UV/IR cut
  • Stacking:  twenty-two 300 second frames using PixInsight
  • Total Time:  1 hour and 50 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,
  • HDRMST3PhLm, Sat, PMath ~(~Stars*~Starless) → Blend, scale
  • Location:  Darling Hill Observatory near Vesper, NY