Asteroid (121) Hermione

Orbital characteristics

Epoch 1-Jul-2021 (2459396.5 JD)
Apoapsis3.8975 AU
5.8306×108 km
Periapsis3.0178 AU
4.5146×108 km
Semi-major axis3.4577 AU
5.1726×108 km
Eccentricity 0.1272119
Inclination7.5650 °
Longitude of asc. node72.917 °
Argument of periapsis296.74 °
Orbital period2348.42 days
6.430 years
Avg. orbital speed15.95 km/s

Physical characteristics

Mean diameter209.00 km
Mass4.701×1018 kg
Avg. density0.983 g/cm3
Equatorial surface gravity0.029 m/s2
0.003 g
Escape velocity0.077 km/s
Rotation period (sidereal)5.5509 hours



Models are given in Stanford Triangle Format (PLY) and Alias Waveform Format (OBJ) - you can use MeshLab or any other tool to convert them to other formats.

Please note that the models are in planetocentric coordinate system, with Z axis passing through north pole. Actual rotational axis may differ from planetocentric poles, especially for small irregular bodies.

Surface Textures

This object does not have textures yet and is being displayed as a solid gray shape.

Last Modified: 23 Aug 2021