A three-dimensional model of 157 Dejanira based on its light curve.
Discovery[1]
Discovered by
A. Borrelly
Discovery date
1 December 1875
Designations
MPC designation
(157) Dejanira
Pronunciation
/dɛdʒəˈnaɪərə/[2]
Alternative designations
A875 XA; 1904 VB; 1978 TS1
Minor planet category
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)
Semi-major axis
2.58161 AU (386.203 Gm)
Eccentricity
0.19507
Orbital period (sidereal)
4.15 yr (1515.1 d)
Average orbital speed
18.36 km/s
Mean anomaly
312.135°
Mean motion
0° 14m 15.396s / day
Inclination
12.160°
Longitude of ascending node
62.070°
Argument of perihelion
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
7.3×1015 kg
Mean density
2.0 g/cm3
Equatorial surface gravity
0.0053 m/s²
Equatorial escape velocity
0.0101 km/s
Synodic rotation period
15.825 h (0.6594 d)
Geometric albedo
0.10
Temperature
~173 K
Absolute magnitude (H)
11.2
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.
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]
^"Discovery Circumstances: Numbered Minor Planets". The International Astronomical Union Minor Planet Center. Retrieved 17 March 2021.
^Benjamin Smith (1903) The Century Dictionary and Cyclopedia
^Cite error: The named reference JPL was invoked but never defined (see the help page).
^"The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
^Cite error: The named reference Pilcher2009 was invoked but never defined (see the help page).
Dejanira (minor planet designation: 157Dejanira) is a main belt asteroid that was discovered by Alphonse Borrelly on 1 December 1875, and named after...
Dejanira may refer to: An alternative spelling of the princess Deianira, wife of Hercules 157Dejanira, an asteroid Dejanira (insect), a beetle in the...
"Séance du 21 décembre". Le Moniteur Scientifique du Docteur Quesneville: 156–157. February 1904. Archived from the original on 2014-10-21. "Séance du 20 décembre"...
background population. Dejanira family 157Dejanira cat Micro-family with 5 members as per Zappalà (1995). All members: (157), (2290), (5276), (10779)...
(July 2009), "Rotation Period Determinations for 120 Lachesis, 131 Vala 157Dejanira, and 271 Penthesilea", The Minor Planet Bulletin, vol. 36, no. 3, pp...
Xanthippe. Springer Berlin Heidelberg. p. 29. doi:10.1007/978-3-540-29925-7_157. ISBN 978-3-540-00238-3. "JPL Small-Body Database Browser: 156 Xanthippe"...
(July 2009), "Rotation Period Determinations for 120 Lachesis, 131 Vala 157Dejanira, and 271 Penthesilea", The Minor Planet Bulletin, 36 (3): 100–102, Bibcode:2009MPBu...
castelli e feudi nell'Oltrepò piacentino, pavese, tortonese" (in Italian). pp. 157–158. "Castello di Fosdinovo - Albero genealogico" (PDF). Archived from the...