50 Virginia
| Discovery[1] | |
|---|---|
| Discovered by | Karl Theodor Robert Luther |
| Discovery date | October 4, 1857 |
| Designations | |
| Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 509.817 Gm (3.408 AU) |
| Perihelion | 283.389 Gm (1.894 AU) |
| Semi-major axis | 396.603 Gm (2.651 AU) |
| Eccentricity | 0.285 |
| Orbital period | 1,576.682 d (4.32 a) |
| Average orbital speed | 17.91 km/s |
| Mean anomaly | 210.994° |
| Inclination | 2.834° |
| Longitude of ascending node | 173.773° |
| Argument of perihelion | 199.961° |
| Physical characteristics | |
| Dimensions | 99.8 km[2] |
| Mass | (2.31 ± 0.70) × 1018[3] kg |
| Mean density | 4.49 ± 1.35[3] g/cm3 |
| Rotation period | 14.31 h[2] |
| Albedo | 0.036[2][4] |
| Temperature | ~171 K |
| Spectral type | Ch[2] |
| Absolute magnitude (H) | 9.24[2] |
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50 Virginia /vərˈdʒɪnjə/ is a large, very dark main belt asteroid. It was discovered by American astronomer James Ferguson on October 4, 1857 from the United States Naval Observatory in Washington, D.C. German astronomer Robert Luther discovered it independently on October 19 from Düsseldorf, and his discovery was announced first.[1]
The reason for Virginia's name is not known; it may be named after Verginia, the Roman noblewoman slain by her father, but it may alternatively have been named after the American state of Virginia, which is contiguous with Washington.[5]
Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico during 2008 gave a light curve with a period of 14.315 ± 0.001 hours and a brightness variation of 0.19 ± 0.02 in magnitude. The shape of the light curve at the maximum was found to change with phase angle.[6]
The orbit of 50 Virginia places it in a 11:4 mean motion resonance with the planet Jupiter. The computed Lyapunov time for this asteroid is only 10,000 years, indicating that it occupies a chaotic orbit that will change randomly over time because of gravitational perturbations of the planets.[7]
Virginia has been studied by radar.[8]
References
- ↑ 1.0 1.1 "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), retrieved 2013-04-07.
- ↑ 2.0 2.1 2.2 2.3 2.4 Yeomans, Donald K., "50 Virginia", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-04-07.
- ↑ 3.0 3.1 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- ↑ Asteroid Data Sets
- ↑ Lutz D. Schmadel, Dictionary of Minor Planet Names, p.20.
- ↑ Pilcher, Frederick (January 2009), "Period Determinations for 33 Polyhymnia, 38 Leda, 50 Virginia, 189 Phthia, and 290 Bruna", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 36 (1): 25–27, Bibcode:2009MPBu...36...25P.
- ↑ Šidlichovský, M. (1999), "Resonances and chaos in the asteroid belt", in Svoren, J.; Pittich, E. M.; Rickman, H., Evolution and source regions of asteroids and comets : proceedings of the 173rd colloquium of the International Astronomical Union, held in Tatranska Lomnica, Slovak Republic, August 24–28, 1998: 297–308, Bibcode:1999esra.conf..297S.
- ↑ "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. Retrieved 2011-10-30.
External links
- Orbital simulation from JPL (Java) / Ephemeris
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