An otherwise dim and inconspicuous object, Kapteyn's Star soon became famous following its discovery in 1897 because of its observed very high proper motion across the sky of 8.7 arcseconds per year, making it the highest of any known stellar object at the time, until the discovery of Barnard's Star in 1916. (americaspace.com)
Both disturbances are incredibly small: investigators anticipate that the gyroscopes will drift just 6.6 arcseconds in relation to a guide star because of the geodetic effect. (scientificamerican.com)
The Washington Double Star (WDS) catalog lists three distant, possibly optical companions for Denebola (WDS 11492 +1434 B, C, and D), located from 40 to 240 arcseconds from the primary with V magnitude differences of 6.3 to 13 (Worley and Douglass, 1997; S.W. Burnham, 1878; and G. Knott, 1864). (solstation.com)