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We describe IXPE polarization observations of the Pulsar Wind Nebula (PWN)MSH15-52, the `Cosmic Hand'. We find X-ray polarization across the PWN, with Bfield vectors generally aligned with filamentary X-ray structures. Highsignificance polarization is seen in arcs surrounding the pulsar and toward theend of the `jet', with polarization degree PD>70%, thus approaching the maximumallowed synchrotron value. In contrast, the base of the jet has lowerpolarization, indicating a complex magnetic field at significant angle to thejet axis. We also detect significant polarization from PSR B1509-58 itself.Although only the central pulse-phase bin of the pulse has high individualsignificance, flanking bins provide lower significance detections and, inconjunction with the X-ray image and radio polarization, can be used toconstrain rotating vector model solutions for the pulsar geometry.

The Polarized Cosmic Hand: IXPE Observations of PSR B1509-58/MSH 15-52