The Double Cluster is the common name for the naked-eye open clusters NGC 884 and NGC 869, which are close together in the constellation Perseus. NGC 884 and NGC 869 are at distances of 7600 and 6800 light-years away, respectively, so they are close to one another in space as well.
They are relatively young clusters, with NGC 869 5.6 million years and NGC 884 at 3.2 million years according to the 2000 Sky Catalogue. In comparison, the Pleiades have an estimated age ranging from 75 million years to 150 million years.
They are also blueshifted, with NGC 869 approaching Earth at a speed of 22 km/s and NGC 884 approaching at a similar speed of 21 km/s. Their hottest main sequence stars are of spectral type B0.
Starshoot pro V2
William Optics Zenithstar 66mm + William optics Reducer/Flattener 3
Other equipment used
Orion 2″ SkyGlow Imaging filter
12 x 3min, 50 bias, 20 flats, 0 darks
Acquired, Calibrated and debayered with Nebulosity.
Stacked, Stretched, Cropped, Saturated and resampled with Pixinsight
Added star spikes with StarSpike pro
The image was cropped to hide the distorted stars at the corners.
Image was resized.