an Xk-subtype that transitions to the K-type asteroids. Rotation period In October 2013, a rotational lightcurve of Gunila was obtained from photometric observations by the ASTR315 class at the University of Maryland. Lightcurve analysis gave an ambiguous rotation period of hours with a low brightness variation of magnitude (), indicative of a rather spherical shape. An alternative period determination by Tom Polakis in 2018 gave hours (or twice the period), also with a low amplitude of magnitude (). In September 2001, an unsuccessful attempt to measure the asteroid's period was made by Brian Warner at the Palmer Divide Observatory in Colorado (). Diameter and albedo According to the survey carried out by the Infrared Astronomical Satellite IRAS, Gunila measures kilometers (km) in diameter and its surface has an albedo of . The Japanese Akari satellite gave a larger diameter of and an albedo of , as did various publications of the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, with diameters of or larger. The Collaborative Asteroid Lightcurve Link adopts the results from IRAS, and gives a diameter of 73.87 km with an albedo of 0.0477 based on an absolute magnitude of 9.58. Three asteroid occultations between 2006 and 2014, gave an estimated diameter of 74, 92 and 93 kilometers, respectively. These timed observations are taken when the asteroid passes in front of a distant star. However the measurements for Gunila were of poor quality in all three cases. Notes References External links Lightcurve Database Query (LCDB), at www.minorplanet.info Dictionary of Minor Planet Names, Google books Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 000983 Discoveries by Karl Wilhelm Reinmuth Named minor planets 000983) 19220730