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Discovery[1] and designation
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| Discovered by | A. Borrelly |
| Discovery date | 1875 |
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Designations
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| Alternate name(s) | |
| Minor planet category |
Main belt |
| Epoch August 27, 2011 (JD 2455800.5) | |
| Aphelion | 461.730 Gm (3.086 AU) |
| Perihelion | 310.251 Gm (2.074 AU) |
| Semi-major axis | 385.991 Gm (2.580 AU) |
| Eccentricity | 0.196 |
| Orbital period | 1513.824 d (4.14 a) |
| Average orbital speed | 18.36 km/s |
| Mean anomaly | 244.361° |
| Inclination | 12.162° |
| Longitude of ascending node | 62.100° |
| Dimensions | 19.1 km |
| Mass | 7.3×1015 kg |
| Mean density | 2.0 g/cm³ |
| Equatorial surface gravity | 0.0053 m/s² |
| Equatorial escape velocity | 0.0101 km/s |
| Sidereal rotation period |
? d |
| Axial tilt | ?° |
| Pole ecliptic latitude | ? |
| Pole ecliptic longitude | ? |
| Geometric albedo | 0.10 |
| Temperature | ~173 K |
| Spectral type | ? |
| Absolute magnitude (H) | 10.6 |
157 Dejanira is a main belt asteroid. The Dejanira asteroid family is named after it.
It was discovered by Alphonse Borrelly on December 1, 1875 and named after the warlike princess Deianira in Greek mythology.
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