675 Ludmilla

675 Ludmilla
	A three-dimensional model of 675 Ludmilla based on its light curve
Discovery
Discovered by	Joel Hastings Metcalf
Discovery site	Taunton, Massachusetts
Discovery date	30 August 1908
Designations
MPC designation	(675) Ludmilla
Alternative designations	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)
Semi-major axis	2.7729 AU (414.82 Gm)
Eccentricity	0.20120
Orbital period (sidereal)	4.62 yr (1686.5 d)
Mean anomaly	98.9547°
Mean motion	0° 12m 48.456s / day
Inclination	9.7796°
Longitude of ascending node	263.200°
Argument of perihelion	152.391°
Physical characteristics
Mean radius	76 km[1]; 67.66±0.94 km [2]
Mass	(6.47±3.14)×1017 kg[3]
Synodic rotation period	7.717 h (0.3215 d)
Absolute magnitude (H)	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

"675 Ludmilla (1908 DU)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 7 May 2016.
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.
Kretlow, Mike. "Size, Mass and Density of Asteroids (SiMDA) – Summary for: (675) Ludmilla". Size, Mass and Density of Asteroids (SiMDA). Retrieved 24 October 2023.

External links

675 Ludmilla at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
675 Ludmilla at the JPL Small-Body Database

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[jpldata-1] "675 Ludmilla (1908 DU)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 7 May 2016.

[Carry2012-2] 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.

[SiMDA-3] Kretlow, Mike. "Size, Mass and Density of Asteroids (SiMDA) – Summary for: (675) Ludmilla". Size, Mass and Density of Asteroids (SiMDA). Retrieved 24 October 2023.