675 Ludmilla

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675 Ludmilla
675Ludmilla (Lightcurve Inversion).png
A three-dimensional model of 675 Ludmilla based on its light curve
Discovery
Discovered by Joel Hastings Metcalf
Discovery site Taunton, Massachusetts
Discovery date30 August 1908
Designations
(675) Ludmilla
1908 DU
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 98.67 yr (36039 d)
Aphelion 3.3308  AU (498.28  Gm)
Perihelion 2.2150 AU (331.36 Gm)
2.7729 AU (414.82 Gm)
Eccentricity 0.20120
4.62 yr (1686.5 d)
98.9547°
0° 12m 48.456s / day
Inclination 9.7796°
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 .

    Contents

    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]

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    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.