157 Dejanira

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157 Dejanira
157Dejanira (Lightcurve Inversion).png
A three-dimensional model of 157 Dejanira based on its light curve.
Discovery[1] and designation
Discovered by A. Borrelly
Discovery date 1875
Alternative names  
Minor planet category Main belt
Orbital characteristics[1][2]
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°
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
Geometric albedo 0.10
Temperature ~173 K
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.[2]


  1. ^ Yeomans, Donald K., "157 Dejanira", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-30. 
  2. ^ 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.