I presume relative to the solar barycenter, and Wikipedia says that speed is its maximum speed (at perihelion of about 1.3 AU). For reference, Earth does a mea

I presume relative to the solar barycenter, and Wikipedia says that speed is its maximum speed (at perihelion of about 1.3 AU). For reference, Earth does a mean speed of about 107,000 km/h relative to the solar system's center of mass.