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We present a catalogue of 261 new infrared selected members of the 3C129galaxy cluster. The cluster, located at $z \approx$ 0.02, forms part of thePerseus-Pisces filament and is obscured at optical wavelengths due to itslocation in the zone of avoidance. We identified these galaxies using the $J-$and $K-$band imaging data provided by the UKIDSS Galactic Plane Survey withinan area with a radius of $1.1^{\circ}$ centred on the X-ray emission of thecluster at $\ell, b \approx 160.52^{\circ}, 0.27^{\circ}$. A total of 26 of theidentified galaxy members have known redshifts 24 of which are from our 2016Westerbork HI survey and two are from optical spectroscopy. An analysis of thegalaxy density at the core of the 3C129 cluster shows it to be less dense thanthe Coma and Norma clusters, but comparable to the galaxy density in the coreof the Perseus cluster. From an assessment of the spatial and velocitydistributions of the 3C129 cluster galaxies that have redshifts, we derived avelocity of $cz = 5227 \pm 171$ km/s and $\sigma = 1097 \pm 252$ km/s for themain cluster, with a substructure in the cluster outskirts at $cz = 6923 \pm71$ km/s with $\sigma = 422 \pm 100$ km/s. The presence of this substructure isconsistent with previous claims based on the X-ray analysis that the cluster isnot yet virialised and may have undergone a recent merger.

A near-infrared study of the obscured 3C129 galaxy cluster