13241 Biyo, provisional designation 1998 KM₄₁, is a background asteroid from the Flora region of the inner asteroid belt, approximately 4 kilometers (2.5 miles) in diameter. It was discovered on 22 May 1998, by the Lincoln Near-Earth Asteroid Research team (LINEAR) at the U.S. Lincoln Laboratory Experimental Test Site in Socorro, New Mexico. The presumed S-type asteroid has a rotation period of 4.4 hours and likely an elongated shape.^[6] It was later named after Filipino educator Josette Biyo.^[1]

Biyo is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.^[2][7] Based on osculating Keplerian orbital elements, the asteroid has also been classified as a member of the Flora family (402), a giant asteroid clan and the largest family of stony asteroids in the main-belt.^[4]

It orbits the Sun in the inner asteroid belt at a distance of 2.1–2.4 AU once every 3 years and 5 months (1,252 days; semi-major axis of 2.27 AU). Its orbit has an eccentricity of 0.06 and an inclination of 7° with respect to the ecliptic.^[3] It was first identified as 1975 UB₁ at the Karl Schwarzschild Observatory in 1975, extending the body's observation arc by 23 years prior to its official discovery observation at Socorro.^[1]

This minor planet was named after Josette Biyo (born 1958), a Filipino educator, former executive director of the Philippine Science High School System and now the director of Department of Science and Technology- Science Education Institute.^[8] The naming was part of the International Excellence in Teaching Award she received during the Intel International Science and Engineering Fair held in Louisville, Kentucky, in 2002, when she was a teacher at the Philippine Science High School in Iloilo, Philippines. Biyo was the first Asian teacher to win the Intel Excellence in Teaching Award.^[1][9] The official naming citation was published by the Minor Planet Center on 24 July 2002 (M.P.C. 46109).^[10]