It orbits the Sun in the outer main belt at a distance of 2.0–3.8 AU once every 5.01 years (1,830 days).
[13] Union has been characterized as a P-type asteroid by the Wide-field Infrared Survey Explorer (WISE), while the LCDB assumes a generic carbonaceous C-type.
[3][9] In March 1984, a rotational lightcurve of Union was obtained from photometric observations by American astronomer Richard Binzel.
[10] In addition, a fragmentary lightcurve with a period of 24 hours was obtained by French amateur astronomer Laurent Bernasconi in 2004 (U=1).
[4][5][6][7][8][9] The Collaborative Asteroid Lightcurve Link adopt the results obtained by IRAS, that is, an albedo of 0.0378 and a diameter of 50.42 kilometers.