Description

This famous double cluster was already known in antique times and was first cataloged by the Greek astronomer Hipparchus in 130 B.C.
Both clusters are visible with the unaided eye between the constellations of Perseus and Cassiopeia as a somewhat bright patch vaguely resembling the number 8.

The clusters are at a distance of 7.100 & 7.400 light years and are physically close, being only a few hundred light years apart.

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Image data

Object info
Name NGC869 & NGC884 – The Double Cluster
Type Open cluster
Constellation Perseus
Right ascension 02h 19m 6s
Declination +57° 09′ 00″
Distance 7.500 ly
Other designations Collinder 24 & 25, Melotte 13 & 14, Caldwell 14
Image info
Image date Oct. 05, 2007
Light frames 12x 5 min. @ ISO800 – Baader UHC-S
Total integration 1h
Dark frames
Flat frames
Bias frames
Software used DSLRFocus, Pixinsight LE, ImagesPlus, Photoshop CS2
Processing DSLRFocus was used to focus the scope and create the imaging series.
ImagesPlus 2.8 was used to calibrate the light frames.
Photoshop CS2 was used for post-processing, levels and curves adjustments.
Equipment info
Telescope TMB/LOMO 80/480
Corrector Televue 2″ TRF 2008 flattener/reducer (FL: 384mm f/4.8)
Mount Losmandy G-11
Camera Canon 350D
Guide camera Atik 1HS Mono
Guide scope Vixen VMC110L
Autoguide software Guidemaster
Filters 2″ Baader UHC-S
Location Landgraaf, The Netherlands
Image comments