It was discovered on 17 November 1914, by Danish astronomer Holger Thiele at Bergedorf Observatory in Hamburg, Germany.
[3] Montana is a stony asteroid that orbits the Sun in the middle main-belt at a distance of 2.4–2.7 AU once every 4.04 years (1,474 days).
[1] Between 2003 and 2007, three rotational lightcurves of Montana were obtained from photometric observations made by amateur astronomers René Roy, Horacio Correia, Laurent Bernasconi, and Richard Ditteon.
All three lightcurves gave a well-defined rotation period of 4.55 hours with a brightness variation between 0.32 and 0.41 magnitude (U=3/3/3).
[11][12] According to the space-based surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Montana's surface has an albedo of 0.28–0.35 and its diameter measures between 19.2 and 21.9 kilometers,[4][5][6][7] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a somewhat larger diameter of 25.4 kilometers, as the lower the albedo, the larger the body's diameter at a constant absolute magnitude.