• The Rho Ophiuchi Cloud Complex
    • Rho Ophiuchi
    Rho Oph Annotated image
  • M4 and Antares in Scorpius and the Rho Ophiuchi Cloud Complex.
  • Hover over the picture for an annotated version
  • Date:  6 and 7 July 2024
  • FOV:  13° × 8° 40'; the angular size of M4 is about 23'
  • Rotation:  −0.075°
  • Telescope:  Canon EF 75-300mm Telephoto Zoom Lens (100.19mm FL)
  • Guiding:  tracking only
  • Computer:  ASIair pro Raspberry Pi
  • Mount:  iOptron CEM40
  • Camera:  ZWO ASI6200MC Pro Cooled (-10°C) Color CMOS with gain 100
  • Pixel size:  3.76 μm
  • Resolution:  7.741 arcsec/pixel
  • Filter:  Optolong UV/IR cut
  • Stacking:  one hundred and forty-two frames using PixInsight
  • 71 frames × 120 sec
  • 22 frames × 240 sec end of 6 July 2024 session
  • 49 frames × 120 sec end of 7 July 2024 session
  • Total Time:  5 hours and 28 minutes
  • Processing:  Pixinsight – MGC, DBE, SPCC, BlurXT, NoiseXT → Linear
  • MAS → Stars, CurvesTrans, Sat
  • Linear, StarXT, MStr, GHS, HST, MAS,
  • PixelMath MAS, MStr + GHS + HST → Starless,
  • CurvesTrans, Sat
  • ScreenBlend Stars, Starless → Final, DynCrop Scaled
  • Location:  Cherry Springs State Park near Coudersport, PA