Image cutouts centred at the position of MCXC J1310.4+2151 from RASS (top), XMM-Newton (centre), and SDSS9-i (bottom). The cluster apertures R_ap = 7′ and R₅₀₀ = 4′ are indicated in blue and red, respectively. The contours from the wavelet filtered XMM-Newton image are shown in green. We identified this NORAS cluster with the SDSS cluster RM J131022.2+215005.6 (RM) or WHL J131022.2+215006 (WH) at ɀ_spec = 0.2730. The distance between the optical position (white circle labelled WH, RM, in the right image) and the NORAS position (blue cross), D = 1.97′ = 0.5R₅₀₀, is due to the cluster morphology, which is unresolved in RASS. The cluster has an offset-centre, possibly bimodal, morphology which is well resolved with XMM-Newton. The main peak is at the position of the optically-identified cluster. There is a secondary peak at the position of the cluster WHY J131028.6+215304 (white circle labelled WHY), located at a very similar redshift of ɀ_spec = 0.2691. The cluster may be in a pre- or post-merger state. The Abell 0958 cluster lies at 3.9′ to the East from the MCXC position.