
Discovery
Discovery date13 October 1898
Designations
MPC designation(440) Theodora
Pronunciation/θiːəˈdɔːrə/
Alternative designations1898 EC
Minor planet categoryMain belt Orbital characteristics
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc117.50 yr (42917 d)
Aphelion2.44735 AU (366.118 Gm) Perihelion1.97352 AU (295.234 Gm)
Semi-major axis2.21043 AU (330.676 Gm)
Eccentricity0.10718
Orbital period (sidereal)3.29 yr (1200.4 d) Mean motion0° 17m 59.669s / day
Inclination1.59566°
Longitude of ascending node292.133°
Argument of perihelion179.039°
Physical characteristics
Dimensions13.6 km
Synodic rotation period4.828 h (0.2012 d) Geometric albedo0.630
Absolute magnitude (H)11.6