675 Ludmilla

675 Ludmilla is a stony minor planet orbiting the Sun. It was named after Mikhail Glinka's opera Ruslan and Lyudmila. This asteroid is orbiting at a distance of from the Sun with an orbital eccentricity of 0.20 and a period of. The orbital plane is inclined at an angle of 9.8° to the plane of the ecliptic. 675 Ludmilla is spinning with a period of.

Mass and density

In 2012, a study by Benoît Carry gave a meta-estimate of a mass of for Ludmilla, based on a single study of its gravitational influence on other Solar System bodies. However, given Ludmilla's diameter of, this mass implies an extremely high density. Such a high density is unphysical, so this mass and density estimate of Ludmilla has been rejected by Carry. Because of Ludmilla's small size, its gravitational influence on other bodies is extremely difficult to detect and may lead to highly inaccurate mass and density estimates. A more recent study in 2019 determined a mass of for Ludmilla, which corresponds to a density of for a diameter of.