Left: Band 8 observation of α Centauri on 2 May 2015, with the color bar for the intensity shown below. Apart from the well-known binary α Cen A and α Cen B, a previously unknown source U was discovered less than 6′′ north of the primary A. The image is primary beam corrected and the slightly oval synthesized beam (Table 1) is shown in gray in the lower left corner. In the FITS image, the FK5 (J2000.0) coordinates at mid-integration, i.e., JD 2 457 144.632219328, are RA = 14^h39^m28491, Dec = − 60° 49′ 5183. Right: logarithmic submm/mm SED of the unidentified source U near α Cen is consistent at the 3σ level with that of a blackbody, as indicated by the dashed line of slope 2.0 (cf. Table 5).