1505 Koranna

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1505 Koranna is a stony asteroid in the central part of the asteroid belt, about 21 kilometers in diameter. It was discovered on 21 April 1939 by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg. The asteroid is named after the Koranna people, indigenous to southern Africa.

Orbit and classification:
Koranna travels around the Sun every about 4.34 years (1,584 days) at a distance of roughly 2.3 to 3.0 astronomical units. Its orbit is moderately elliptical and inclined about 14 degrees to the plane of the Solar System. It is generally considered a background asteroid in the main belt, though it is also sometimes listed as a member of the Eunomia family, a large group of stony asteroids.

Rotation and shape:
Observations give a rotation period of about 4.45 hours. The brightness changes as it spins, which suggests an elongated, non-spherical shape.

Size and albedo:
Measurements from infrared surveys put its diameter between about 20.5 and 22.8 kilometers, with an albedo (reflectivity) between roughly 0.08 and 0.13.

Identification and naming:
Koranna was first identified in 1935 as 1935 MD, and the official naming citation was published in 1953.