Double Cluster

The Double Cluster is the common name for the naked-eye open clusters NGC 869 and NGC 884 which are close together in the constellation Perseus. NGC 869 and NGC 884 both lie at a distance of 7500 light years. NGC 869 has a mass of 3700 solar masses and NGC 884 weighs in at 2800 solar masses; however, later research has shown both clusters are surrounded with a very extensive halo of stars, with a total mass for the complex of at least 20,000 solar masses. more

Double cluster

Image details:
Telescope: TS 90/600 triplet with 2.5" TS flattener
Mount: Skywatcher AZ-EQ-GT
Camera: Atik one 6.0
Exposure: 11 * 300sec RGB
Software: PixInsight, PHD
Calibrationfiles: Dark:No, Bias:Yes, Flat:Yes

Double cluster

Image details:
Telescope: TS 90/600 triplet with 2.5" TS flattener
Mount: Skywatcher HEQ5-Synscan
Camera: Canon 60d (modded)
Exposure: 59 * 120sec
Date: September 11, 2014.
Software: PixInsight
Calibrationfiles: Dark:Yes, Bias:Yes, Flat:Yes

 
(c) All photos by Ruud de Vries