1580 Betulia, provisional designation 1950 KA, is an eccentric, carbonaceous asteroid, classified as near-Earth object of the Amor group, approximately 4.2 kilometers in diameter.

[1] In the Tholen classification, Betulia is an unusual C-type asteroid, as near-Earth objects are typically of stony rather than carbonaceous composition.

Analysis of the best-rated lightcurve gave a rotation period of 6.1324 hours with a brightness variation of 0.70 magnitude (U=3), indicating that the body has a non-spheroidal shape.

[6][11][16] According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Radar observations at the Arecibo Observatory in Puerto Rico, Tom Gehrels estimate from the Hazards due to Comets and Asteroids, and observations by Alan W. Harris using the NASA Infrared Telescope Facility on Mauna Kea, Hawaii, Betulia measures between 3.82 and 8.55 kilometers in diameter and its surface has an albedo between 0.04 and 0.17.

[1][4][5][8][9][10][18] The Collaborative Asteroid Lightcurve Link takes an albedo of 0.09 and a diameter of 4.2 kilometers as best estimates and adopts an absolute magnitude of 15.1.