Using JPL Horizons with an observed orbital arc of 235 days, the barycentric orbital elements for epoch 2020-Jan-01 generate a semi-major axis of 518 AU and a period of approximately 11,800 years.
Using JPL Horizons with an observed orbital arc of 147 days, the barycentric orbital elements for epoch 2020-Jan-01 generate a semi-major axis of 515 AU and a period of approximately 11,700 years.