|Discovery and designation|
|Discovered by||A. Borrelly|
|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)|
|Orbital period||1513.824 d (4.14 a)|
|Average orbital speed||18.36 km/s|
|Longitude of ascending node||62.100°|
|Mean density||2.0 g/cm³|
|Equatorial surface gravity||0.0053 m/s²|
|Equatorial escape velocity||0.0101 km/s|
|Absolute magnitude (H)||10.6|
157 Dejanira is a main belt asteroid that was discovered by Alphonse Borrelly on December 1, 1875 and named after the warlike princess Deianira in Greek mythology. The Dejanira family of asteroids is named after it.
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.
- Yeomans, Donald K., "157 Dejanira", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-30.
- Pilcher, Frederick (July 2009), "Rotation Period Determinations for 120 Lachesis, 131 Vala 157 Dejanira, and 271 Penthesilea", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 36 (3): 100-102, Bibcode:2009MPBu...36..100P.
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