• NGC 7635 and M52 in Cassiopeia
    • Bubble Nebula
    Annotated image
  • NGC 7635, the Bubble Nebula, and M52, an open cluster in Cassiopeia.
  • The zombie star nova V1405 Cas 2021, 5600 ly from us,
  • has dimmed significantly since May 2021.
  • Hold the shift key down to see V1405 Cas 2021
  • taken on 2021 August 28.
  • Hover over the picture for an annotated version
  • Date:  21 July 2025
  • FOV:  cropped to 99' × 66'
  • Telescope:  Celestron C14 SCT (3910mm, f/11)
  • Starizona HyperStar (731.83mm, f/1.9)
  • Guiding:  ZWO2600 MC Duo internal ASI220MM mini
  • Computer:  ASIair plus 256GB
  • Mount:  iOptron CEM120
  • Camera:  ZWO ASI2600 MC Duo Cooled (0°C) Color CMOS gain 100
  • Pixel size:  3.76 μm
  • Resolution:  1.060 arcsec/pixel
  • Filter:  Optolong UV/IR cut × 28
  • Optolong L-eNhance × 69
  • Frames:  ninety-seven 180 second subs
  • Total Time:  4 hours and 51 minutes
  • Calibration:  20 flats, 20 dark flats, and 10 darks
  • Processing:  Pixinsight – SPCC, DBE, SPCC, BlurXT, NoiseXT → Linear
  • MStr, GHS, HST, PMath MStr + GHS + HST →
  • Stars, Sat 28 frames
  • StarXT, MStr, GHS, HST, PMath MStr + GHS + HST →
  • Starless 69 frames
  • PMath ~(~Stars*~Starless) → Blend, scale
  • Location:  Darling Hill Observatory near Vesper, NY