157 Dejanira
Dejanira (minor planet designation: 157 Dejanira) is a main belt asteroid that was discovered by Alphonse Borrelly on 1 December 1875, and named after the warlike princess Deianira in Greek mythology (Δηιάνειρα in Greek). The Dejanira family of asteroids is named after it.
A three-dimensional model of 157 Dejanira based on its light curve. | |
| Discovery | |
|---|---|
| Discovered by | A. Borrelly |
| Discovery date | 1 December 1875 |
| Designations | |
MPC designation | (157) Dejanira |
| Pronunciation | /dɛdʒəˈnaɪərə/ |
Alternative designations | A875 XA; 1904 VB; 1978 TS1 |
Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 111.13 yr (40590 d) |
| Aphelion | 3.0852 AU (461.54 Gm) |
| Perihelion | 2.07801 AU (310.866 Gm) |
Semi-major axis | 2.58161 AU (386.203 Gm) |
| Eccentricity | 0.19507 |
Orbital period (sidereal) | 4.15 yr (1515.1 d) |
Average orbital speed | 18.36 km/s |
Mean anomaly | 312.135° |
Mean motion | 0° 14m 15.396s / day |
| Inclination | 12.160° |
Longitude of ascending node | 62.070° |
| 46.282° | |
| Earth MOID | 1.11241 AU (166.414 Gm) |
| Jupiter MOID | 2.16656 AU (324.113 Gm) |
| TJupiter | 3.366 |
| Physical characteristics | |
| 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 |
Synodic rotation period | 15.825 h (0.6594 d) |
| 0.10 | |
| Temperature | ~173 K |
| 11.2 | |
Photometric observations of this asteroid were made in early 2009 at the Organ Mesa Observatory in Las Cruces, New Mexico. The resulting light curve shows a synodic rotation period of 15.825 ± 0.001 hours.
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