[2] Seilandfarm orbits the Sun in the inner main-belt at a distance of 2.2–2.3 AU once every 3 years and 5 months (1,244 days).
[1] According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its NEOWISE mission, Seilandfarm measures between 6.3 and 7.5 and kilometers in diameter, and its surface has a corresponding albedo between 0.178 and 0.279,[5][6][7] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 7.1 kilometers, in agreement with the results obtained by the space-based observations.
[3] In February 2009 and September 2014, three rotational lightcurves were obtained from photometric observations by astronomers Donald P. Pray and Petr Pravec at the U.S. Carbuncle and the Czech Ondřejov Observatory, respectively.
The lightcurves rendered a well-defined rotation period of 3.9681 and 3.9683 hours with a corresponding brightness variation of 0.15 and 0.17 magnitude, indicating that the asteroid's shape is nearly spheroidal (U=3/3/3).
Based on mutual eclipse/occultation events, the satellite is thought to be at least 29% the size of Seilandfarm,[a] which translates into a diameter of approximately 2 kilometers or more.