132 Aethra
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| Discovery | |
|---|---|
| Discovered by | James C. Watson |
| Discovery date | June 13, 1873 |
| Designations | |
| Named after | Aethra |
| Alternative names | A922 XB; 1949 MD; 1953 LF |
| Minor planet category | Main belt (Mars crosser) |
| Orbital characteristics[1] | |
| Epoch July 14, 2004 (JD 2453200.5) | |
| Aphelion | 3.622 AU (541.841 Gm) |
| Perihelion | 1.595 AU (238.558 Gm) |
| Semi-major axis | 2.608 AU (390.199 Gm) |
| Eccentricity | 0.389 |
| Orbital period | 4.21 a (1538.652 d) |
| Average orbital speed | 17.72 km/s |
| Mean anomaly | 89.813° |
| Inclination | 25.055° |
| Longitude of ascending node | 258.945° |
| Argument of perihelion | 254.330° |
| Physical characteristics | |
| Dimensions |
42.87 km[1] 35.83 ± 6.59[2] km |
| Mass | (0.41 ± 2.71) × 1018[2] kg |
| Equatorial surface gravity | 0.012 m/s² |
| Escape velocity | 0.023 km/s |
| Rotation period | 0.2153 d (5.168 h)[1] |
| Albedo | 0.199[1] |
| Temperature | ~168 K |
| Spectral type | M |
| Absolute magnitude (H) | 9.21[1] |
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132 Aethra is an M-type main-belt asteroid. It has a rather eccentric orbit that sometimes brings it closer to the Sun than the planet Mars. It was discovered by James Craig Watson in 1873 and is the first such Mars-crosser asteroid to be identified. As a Mars-crosser asteroid, Aethra is the lowest numbered asteroid to not have proper orbital elements due to recurring perturbations by Mars.
With an original observation arc of only 22 days, 132 Aethra was a lost asteroid between 1873 and 1922.[3][4]
The varying light curve of the asteroid implies an elongated or irregular shape for its body.
It is named after Aethra, the mother of Theseus in Greek mythology.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 "JPL Small-Body Database Browser: 132 Aethra". 2000-06-10 last obs. Retrieved 2008-11-30.
- ↑ 2.0 2.1 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.
- ↑ Herge, Paul (1938). "The orbit and perturbations of (132) Aethra". Astronomical Journal 47 (1081): 17–23. Bibcode:1938AJ.....47...17H. doi:10.1086/105455.
- ↑ The planet observer's handbook (2000), By Fred William Price, Page 192. (Google Books 2010)
External links
- Orbital simulation from JPL (Java) / Ephemeris
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