
Discovery
Discovery date25 August 1897
Designations
MPC designation(426) Hippo
Pronunciation/ˈhɪpoʊ/
Named afterHippo Regius (Ἱππών Hippōn) Alternative designations1897 DH
Minor planet categoryMain belt AdjectivesHipponian /hɪˈpoʊniən/
Orbital characteristics
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc112.19 yr (40977 d)
Aphelion3.1893 AU (477.11 Gm) Perihelion2.5893 AU (387.35 Gm)
Semi-major axis2.8893 AU (432.23 Gm)
Eccentricity0.10384
Orbital period (sidereal)4.91 yr (1793.8 d) Mean motion0° 12m 2.484s / day
Inclination19.4771°
Longitude of ascending node311.419°
Argument of perihelion222.319°
Proper orbital elements
Proper semi-major axis2.88928 AU Proper eccentricity0.179526
Proper inclination20.3798°
Proper mean motion73.2862 deg / yr Proper orbital period4.91225 yr (1794.199 d) Precession of perihelion32.8357 arcsec / yr Precession of the ascending node−59.8571 arcsec / yr Physical characteristics
Synodic rotation period34.3 h (1.43 d) Geometric albedo0.0469±0.003
Temperature154-171 K
Absolute magnitude (H)8.42