675 Ludmilla is a stony ( S-type)

minor planet According to the International Astronomical Union (IAU), a minor planet is an astronomical object in direct orbit around the Sun that is exclusively classified as neither a planet nor a comet. Before 2006, the IAU officially used the term ''minor ...

orbiting the

Sun The Sun is the star at the centre of the Solar System. It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light a ...

. It was named after

Mikhail Glinka Mikhail Ivanovich Glinka ( rus, links=no, Михаил Иванович Глинка, Mikhail Ivanovich Glinka, mʲɪxɐˈil ɨˈvanəvʲɪdʑ ˈɡlʲinkə, Ru-Mikhail-Ivanovich-Glinka.ogg; ) was the first Russian composer to gain wide recognit ...

's opera '' Ruslan and Lyudmila''. This asteroid is orbiting at a distance of from the Sun with an

orbital eccentricity In astrodynamics, the orbital eccentricity of an astronomical object is a dimensionless parameter that determines the amount by which its orbit around another body deviates from a perfect circle. A value of 0 is a circular orbit, values be ...

of 0.20 and a period of . The

orbital plane The orbital plane of a revolving body is the geometric plane in which its orbit lies. Three non-collinear points in space suffice to determine an orbital plane. A common example would be the positions of the centers of a massive body (host) a ...

is inclined at an angle of 9.8° to the

plane of the ecliptic The ecliptic or ecliptic plane is the orbital plane of Earth around the Sun. It was a central concept in a number of ancient sciences, providing the framework for key measurements in astronomy, astrology and calendar-making. From the perspe ...

. 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 .

References

External links

* * {{DEFAULTSORT:Ludmilla 000675 Discoveries by Joel Hastings Metcalf Named minor planets 000675 000675 19080830