4904 Makio, provisional designation 1989 WZ, is a stony asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered by Japanese astronomers Yoshikane Mizuno and Toshimasa Furuta at Kani Observatory (403) on 21 November 1989.[3] It was named after Japanese astronomer Makio Akiyama.[2]
Orbit and classification
Makio orbits the Sun in the inner main-belt at a distance of 2.1–2.7 AU once every 3 years and 8 months (1,348 days). Its orbit has an eccentricity of 0.13 and an inclination of 10° with respect to the ecliptic.[1]
A rotational lightcurve of Makio was obtained from photometric observations made by Julian Oey at the Australian Kingsgrove Observatory (E19) in March 2009. Lightcurve analysis gave a rotation period of 7.830 hours with a small brightness variation of 0.08 magnitude, indicative of a spheroidal shape (U=2).[7]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Makio measures 7.0 kilometers in diameter and its surface has an albedo of 0.33,[5][6] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 9.4 kilometers with an absolute magnitude of 12.5.[4]