157 Dejanira
Main-belt asteroid
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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 (ÎηιάνειÏα in Greek). The Dejanira family of asteroids is named after it.
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A three-dimensional model of 157 Dejanira based on its light curve. | |
| Discovery[1] | |
|---|---|
| Discovered by | A. Borrelly |
| Discovery date | 1 December 1875 |
| Designations | |
| (157) Dejanira | |
| Pronunciation | /dÉdÊÉËnaɪÉrÉ/[2] |
| A875 XA; 1904 VB; 1978 TS1 | |
| Main belt | |
| Orbital characteristics[3][4] | |
| 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) |
| 2.58161 AU (386.203 Gm) | |
| Eccentricity | 0.19507 |
| 4.15 yr (1515.1 d) | |
Average orbital speed | 18.36 km/s |
| 312.135° | |
| 0° 14m 15.396s / day | |
| Inclination | 12.160° |
| 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 | 7.3Ã1015 kg |
Mean density | 2.0 g/cm3 |
Equatorial surface gravity | 0.0053 m/s² |
Equatorial escape velocity | 0.0101 km/s |
| 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.[5]
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