M 57

  • Date: May – August 2008
  • Exposure: 22 hours LHaRGB (146:990:58:46:54 min.)
  • FWHM: 2.1 arcsec
  • Additional notes: APOD 18 September 2008
  • Telescope: 18” f/5.3 Newtonian
  • Mount: Heavy Forkmount
  • Camera: SBIG ST10-XME
  • Filters: Astronomik Typ II.c LRGB