(190) Ismene

Asteroid (190) Ismene
Properties of the orbit ( animation ) Epoch: May 31, 2020 ( JD 2,459,000.5)
Orbit type	Outer main belt
Major semi-axis	3,987 AU
eccentricity	0.167
Perihelion - aphelion	3.322 AU - 4.652 AU
Inclination of the orbit plane	6.2 °
Length of the ascending node	175.5 °
Argument of the periapsis	271.1 °
Time of passage of the perihelion	July 18, 2021
Sidereal period	7.96 a
Mean orbital velocity	14.8 km / s
Physical Properties
Medium diameter	159 km
Albedo	0.07
Rotation period	6.52 h
Absolute brightness	7.7 likes
Spectral class (according to Tholen)	P
Spectral class (according to SMASSII)	X
history
Explorer	Christian Heinrich Friedrich Peters
Date of discovery	September 22, 1878
Another name	A878 SA , 1947 QJ, 1951 DB
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.

(190) Ismene is a main outer belt asteroid discovered by CHF Peters at the Hamilton College Observatory in Clinton on September 22, 1878 .

Ismene is part of the Hilda family. This is a group of asteroids that orbit the Sun in a 3: 2 orbital resonance with the planet Jupiter .

The heavenly body was named after Ismene , the daughter of Oedipus and Iocaste from Greek mythology .

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