Unveiling the nature of the isolated neutron star 2XMM J104608.7-594306

2XMM J104608.7594306 is a newly discovered INS sharing many properties of theintriguing Magnificent Seven (M7). It shows thermal Xray emission, stable flux,no counterparts at other wavelengths, and has a unique temperature between theM7 and the only Xraydetected RRAT. Estimates of birthrates of M7like INSs andRRATs show they may greatly outnumber active radio pulsars, meaning the rate ofType II SN cannot account for all observed classes. This INS is of particularimportance since it may well be a missing link between the M7, magnetars andRRATs. We propose to characterize its spectrum, infer its magnetic field frompossible absorption lines and measure its spin period to constrain itsevolutionary status and shed light on its relation to other INSs. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]