NGC 1746 is an asterism or open cluster in the constellation Taurus, it was discovered in 1828.

What you are actually looking at is not a single cluster but an optical grouping of stars belonging to three different clusters which just happen to be in the exact same spot in space when seen from our location. In reality they are at a distance of 420, 2.053 and 2.477 light years.

The 3 different clusters overlapping each other are NGC1746, NGC1750 and NGC1758.

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Image data

Object info
Name NGC1746
Type Open cluster
Constellation Taurus
Right ascension 05h 03m 50s
Declination +23° 46′ 04″
Distance 2.477 ly
Other designations
Image info
Image date Dec. 29, 2013
Light frames 6x 4 min. RGB (each) unbinned
Total integration 1h 12m
Dark frames 30x
Flat frames 25x p. filter unbinned, created with an A3 size Posterpoweruk flatfield panel
Bias frames 25x
Software used CCDOps, CCDSoft, Maxim DL, Photoshop CS4
Processing CCDOPS was used for focussing. Image Acquisition was done using CCDSoft.
All separate frames were calibrated, aligned and stacked in MaxIm DL5 Pro.
Photoshop CS4 was used for further processing – curves adjustment, levels adjustment, etc.
Noel Carboni’s toolset was used as well (Local Contrast Enhancement, Deep Space Noise Reduction)
RGB combine was done in Photoshop.
Equipment info
Telescope TMB/LOMO 80/480
Corrector Televue 2″ TRF 2008 flattener/reducer (FL: 384mm f/4.8)
Mount Losmandy G-11 Gemini
Camera SBIG ST-8300M
Guide camera Atik 1HS Mono
Guide scope Vixen VMC110L
Autoguide software PHD Guiding
Filters Baader 2″ RGB + IDAS LPS-P2
Location Landgraaf, The Netherlands
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