157 Dejanira

Dejanira (minor planet designation: 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 (Δηιάνειρα in Greek). The Dejanira family of asteroids is named after it.

157 Dejanira
A three-dimensional model of 157 Dejanira based on its light curve.
Discovery[1]
Discovered byA. Borrelly
Discovery date1 December 1875
Designations
(157) Dejanira
Pronunciation/dɛdʒəˈnaɪərə/[2]
Main belt
Orbital characteristics[3][4]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc111.13 yr (40590 d)
Aphelion3.0852 AU (461.54 Gm)
Perihelion2.07801 AU (310.866 Gm)
2.58161 AU (386.203 Gm)
Eccentricity0.19507
4.15 yr (1515.1 d)
18.36 km/s
312.135°
0° 14m 15.396s / day
Inclination12.160°
62.070°
46.282°
Earth MOID1.11241 AU (166.414 Gm)
Jupiter MOID2.16656 AU (324.113 Gm)
TJupiter3.366
Physical characteristics
Dimensions19.1 km
Mass7.3×1015 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]

    References
    2. Benjamin Smith (1903) The Century Dictionary and Cyclopedia
    3. Yeomans, Donald K., "157 Dejanira", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
    4. "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
    5. Pilcher, Frederick (July 2009), "Rotation Period Determinations for 120 Lachesis, 131 Vala 157 Dejanira, and 271 Penthesilea", The Minor Planet Bulletin, 36 (3), pp. 100–102, Bibcode:2009MPBu...36..100P.


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