It was discovered on 4 September 1951, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany.
[8] According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Gilmore measures 7.2 kilometers in diameter and its surface has an albedo of 0.309,[4] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.21 and calculates a diameter of 6.7 kilometers with an absolute magnitude of 13.19.
[3] From January to February 2014, two rotational lightcurves of Gilmore were obtained from photometric observations at the Palomar Transient Factory, California.
The lightcurves gave a rotation period of 4.230 and 4.2302 hours with a brightness variation of 0.34 and 0.35 in magnitude, respectively (U=2/2).
They research at the Mount John University Observatory since 1980, and are members of the Royal Astronomical Society of New Zealand.