Astronomy:675 Ludmilla
.png) 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 | |
| (675) Ludmilla | |
| 1908 DU | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 98.67 yr (36039 d) |
| |{{{apsis}}}|helion}} | 3.3308 astronomical unit|AU (498.28 Gm) |
| |{{{apsis}}}|helion}} | 2.2150 AU (331.36 Gm) |
| 2.7729 AU (414.82 Gm) | |
| Eccentricity | 0.20120 |
| Orbital period | 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° |
| 152.391° | |
| Physical characteristics | |
| Mean radius | 76 km[1] 67.66±0.94 km [2] |
| Mass | (6.47±3.14)×1017 kg[3] |
| 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
- ↑ 1.0 1.1 "675 Ludmilla (1908 DU)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=675;cad=1.
- ↑ 2.0 2.1 2.2 2.3 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: pp. 98–118, doi:10.1016/j.pss.2012.03.009, Bibcode: 2012P&SS...73...98C. See Table 1.
- ↑ 3.0 3.1 Kretlow, Mike. "Size, Mass and Density of Asteroids (SiMDA) – Summary for: (675) Ludmilla". Size, Mass and Density of Asteroids (SiMDA). https://astro.kretlow.de/simda/. Retrieved 24 October 2023.
External links
- 675 Ludmilla at AstDyS-2, Asteroids—Dynamic Site
- 675 Ludmilla at the JPL Small-Body Database
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