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.

157 Dejanira
157Dejanira (Lightcurve Inversion).png
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/dɛəˈnaɪərə/[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]

ReferencesEdit

  1. ^ "Discovery Circumstances: Numbered Minor Planets". The International Astronomical Union Minor Planet Center. Retrieved 17 March 2021.
  2. ^ Benjamin Smith (1903) The Century Dictionary and Cyclopedia
  3. ^ Yeomans, Donald K., "157 Dejanira", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, archived from the original on 3 August 2020, 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, vol. 36, no. 3, pp. 100–102, Bibcode:2009MPBu...36..100P.

External linksEdit