"In a study led by Terry Long Phan and published in Cambridge University Press, the team searches for Planet Nine candidates by using two far-infrared all-sky surveys, IRAS and AKARI, whose 23-year separation allows detection of Planet Nine’s expected orbital motion (~3′/year)"

"After a rigorous analysis and selection process, including visual inspection of images, the team identified one strong candidate pair, where the IRAS and AKARI sources showed the expected angular separation (42′–69.6′) and were not detected at the same position in each survey. The AKARI detection probability map confirmed the candidate’s consistency with a slow-moving object, showing two detections on one date and none six months earlier. However, IRAS and AKARI data alone are insufficient to determine a precise orbit so there will need to be follow-up observations with DECam, which can detect faint moving objects within about an hour of exposure, are suggested to confirm the candidate and fully determine its orbit, aiding in understanding the solar system’s evolution and structure."