675 Ludmilla
A three-dimensional model of 675 Ludmilla based on its light curve
Discovery
Discovered byJoel Hastings Metcalf
Discovery siteTaunton, Massachusetts
Discovery date30 August 1908
Designations
(675) Ludmilla
1908 DU
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc98.67 yr (36039 d)
Aphelion3.3308 AU (498.28 Gm)
Perihelion2.2150 AU (331.36 Gm)
2.7729 AU (414.82 Gm)
Eccentricity0.20120
4.62 yr (1686.5 d)
98.9547°
0° 12m 48.456s / day
Inclination9.7796°
263.200°
152.391°
Physical characteristics
Mean radius
76 km[1]
67.66±0.94 km [2]
Mass(6.47±3.14)×1017 kg[3]
7.717 h (0.3215 d)
7.91

    675 Ludmilla is a minor planet orbiting the Sun. It was named after Mikhail Glinka's opera Ruslan and Lyudmila.

    Mass and density

    In 2012, a study by Benoît Carry estimated a mass of (1.20±0.24)×1019 kg for Ludmilla based on its gravitational influence on other Solar System bodies.[2] However, given Ludmilla's diameter of 67.7 km (42.1 mi), this mass implies an extremely high density 73.99±15.05 g/cm3. Such a high density is unphysical, so this mass and density estimate of Ludmilla has been rejected by Carry.[2] 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.[2] A more recent study in 2019 determined a mass of (6.47±3.14)×1017 kg for Ludmilla, which corresponds to a density of 3.99±1.94 g/cm3 for a diameter of 67.7 km (42.1 mi).[3]

    References

    1. 1 2 "675 Ludmilla (1908 DU)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 7 May 2016.
    2. 1 2 3 4 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
    3. 1 2 Kretlow, Mike. "Size, Mass and Density of Asteroids (SiMDA) – Summary for: (675) Ludmilla". Size, Mass and Density of Asteroids (SiMDA). Retrieved 24 October 2023.


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