3254 Bus, provisional designation 1982 UM, is a rare-type Hildian asteroid from the outermost region of the asteroid belt, approximately 32 kilometers in diameter. It was discovered on 17 October 1982, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station in Flagstaff, Arizona.[3] It is named after astronomer Schelte J. Bus.[2]
Located in the outermost part of the main-belt, Bus is a member of the Hilda family, a large orbital group of asteroids that are thought to have originated from the Kuiper belt.[3] It orbits the Sun at a distance of 3.3–4.6 AU once every 7 years and 10 months (2,873 days). Its orbit has an eccentricity of 0.16 and an inclination of 4° with respect to the ecliptic.[1] It was first identified as 1982 SW4atCrimea–Nauchnij, extending the body's observation arc by 3 weeks prior to its official discovery observation at Flagstaff.[3]
In the late 1980s or early 1990s, a rotational lightcurveofBus was obtained from photometric observations by American astronomer Richard P. Binzel. Lightcurve analysis gave a rotation period of 6.62 hours with a brightness variation of 0.31 magnitude (U=2).[7]
According to the surveys carried out by the Japanese Akari satellite and the WISE spacecraft with its subsequent NEOWISE mission, Bus measures 31.104 and 35.07 kilometers in diameter and its surface has an albedo of 0.058 and 0.073, respectively.[5][6] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 32.03 kilometers using an absolute magnitude of 11.2.[4]
