Astronomy Today@astronomytodayA 2025 paper by an international team reported a Planet Nine candidate, drawn from infrared sky surveys taken two decades apart.
That search left a single object whose brightness and movement fit the predictions. Two sightings are too few to pin down its orbit, and its 120-degree tilt is far from the 15 to 20 degrees Planet Nine would need.
Mike Brown and Konstantin Batygin, who proposed Planet Nine, say the object may be real but would not be their Planet Nine, and Batygin calls it Planet 8.5. More observations are needed.
