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Asteroid (121) Hermione

Orbital characteristics

Epoch 4-Sep-2017 (2458000.5 JD)
Apoapsis3.9070 AU
5.8447×108 km
Periapsis2.9873 AU
4.4689×108 km
Semi-major axis3.4471 AU
5.1568×108 km
Inclination7.5975 °
Longitude of asc. node73.131 °
Argument of periapsis298.19 °
Orbital period2337.69 days
6.400 years
Avg. orbital speed15.97 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: 20 Feb 2018