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2007OR10 is currently the third largest known dwarf planet in thetransneptunian region, with an effective radiometric diameter of ~1535 km. Ithas a slow rotation period of ~45 h that was suspected to be caused by tidalinteractions with a satellite undetected at that time. Here we report on thediscovery of a likely moon of 2007OR10, identified on archival Hubble SpaceTelescope WFC3/UVIS system images. Although the satellite is detected at twoepochs, this does not allow an unambiguous determination of the orbit and theorbital period. A feasible 1.5-5.8x10^21 kg estimate for the system mass leadsto a likely 35 to 100 d orbital period. The moon is about 4.2m fainter than2007OR10 in HST images that corresponds to a diameter of 237 km assuming equalalbedos with the primary. Due to the relatively small size of the moon theprevious size and albedo estimates for the primary remains unchanged. With thisdiscovery all trans-Neptunian objects larger than 1000 km are now known toharbour satellites, an important constraint for moon formation theories in theyoung Solar system.

Discovery of a satellite of the large trans-Neptunian object (225088) 2007OR10