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We report on the discovery in the Gaia DR3 astrometric and spectroscopiccatalog of a new polar stream that is found as an over-density in action space.This structure is unique as it has an extremely large apocenter distance,reaching beyond 100 kpc, and yet is detected as a coherent moving structure inthe Solar neighborhood with a width of $\sim 4$ kpc. A sub-sample of thesestars that was fortuitously observed by LAMOST has a mean spectroscopicmetallicity of $\langle {\rm [Fe/H]}\rangle = -1.60^{+0.15}_{-0.16}$ dex andpossesses a resolved metallicity dispersion of $\sigma({\rm [Fe/H]}) =0.32^{+0.17}_{-0.06}$ dex. The physical width of the stream, the metallicitydispersion and the vertical action spread indicate that the progenitor was adwarf galaxy. The existence of such a coherent and highly radial structure attheir pericenters in the vicinity of the Sun suggests that many other dwarfgalaxy fragments may be lurking in the outer halo.

Typhon: a polar stream from the outer halo raining through the Solar neighborhood