4672 Takuboku
4672 Takuboku, provisional designation , is a background asteroid from the outer regions of the asteroid belt, approximately in diameter. It was discovered on 17 April 1988, by Japanese astronomers Seiji Ueda and Hiroshi Kaneda at the Kushiro Observatory on Hokkaido, Japan. The asteroid was named after the Japanese poet Takuboku Ishikawa. In 2005, measurement of the body's occultation ellipse also gave 35.0 × 35.0 kilometers. Orbit and classification Takuboku is a non-family asteroid from the main belt's background population. It orbits the Sun in the outer main-belt at a distance of 3.0–3.3 AU once every 5 years and 8 months (2,078 days; semi-major axis of 3.19 AU). Its orbit has an eccentricity of 0.05 and an inclination of 16° with respect to the ecliptic. The body's observation arc begins with its first observation as at Crimea–Nauchnij in April 1971, or 17 years prior to its official discovery observation at Kushiro. Physical characteristics Takuboku has an absolute magnitude of between 10.90 and 11.4. As of 2018, no rotational lightcurve of Takuboku has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown. Diameter and albedo According to the surveys carried out by the NEOWISE mission of