M13, M27, M57, and NGC 5466 on 17 June 2005

M13.  Total integration time 137×8.53 sec = 19.5 min.



M27 (the Dumbbell Nebula).  Total integration time 419×8.53 sec = 60 min.



M57 (the Ring Nebula).  Total integration time 280×8.53 sec = 40 min.  The V magnitudes shown are from photometry of M57 field stars taken by Arne Hendon (USNO-Flagstaff).  See Brian Skiff’s page on M57 field star photometry for more information.



NGC 5466 on June 17, 2005.  Prime focus (f/8.0).  Total integration time 349×8.53 sec = 50 min.  This is a faint, sparse globular cluster, roughly 52,000 light years distant.