Hermippe (moon)
| Hermippe | |
|---|---|
| Provisional or systematic name | S / 2001 J 3 |
| Central body | Jupiter |
| Properties of the orbit | |
| Major semi-axis | 21,131,000 km |
| Periapsis | 16,693,500 km |
| Apoapsis | 25,568,500 km |
| eccentricity | 0.210 |
| Orbit inclination | 150.7 ° |
| Orbital time | 633.9 d |
| Mean orbital velocity | 2.42 km / s |
| Physical Properties | |
| Albedo | 0.04 |
| Apparent brightness | 22.1 mag |
| Medium diameter | 4 km |
| Dimensions | 9.0 × 10 13 kg |
| Acceleration of gravity on the surface | ≈ 0 m / s 2 |
| Escape speed | ≈ 0 m / s |
| discovery | |
| Explorer | |
| Date of discovery | December 9, 2001 |
Hermippe (also Jupiter XXX) is one of the smallest known outer moons of the planet Jupiter .
discovery
Hermippe was discovered by astronomers at the University of Hawaii on December 9, 2001 . It was initially given the provisional designation S / 2001 J 3.
The moon was named after Hermippe , a lover of Zeus from Greek mythology .
Orbit data
Hermippe orbits Jupiter at an average distance of 21,131,000 km in 633 days and 22 hours. The track has an eccentricity of 0.210. With an inclination of 150.7 ° from the local Laplace plane , the orbit is retrograde, i.e. that is, the moon moves around the planet against the direction of rotation of Jupiter.
Due to its orbit characteristics, Hermippe is assigned to the Ananke group , named after the Jupiter moon Ananke .
Physical data
Hermippe has an average diameter of about 4 km. Their density is estimated at 2.6 g / cm³. It is probably made up mainly of silicate rock. Hermippe has a very dark surface with an albedo of 0.04, i.e. that is, only 4% of the incident sunlight is reflected. Their apparent brightness is 22.1 m .
Web links
- MPEC 2002-J54: Eleven new Satellites of Jupiter May 15, 2002 (discovery)
- IAUC 7900: Satellites of Jupiter May 16, 2002 (discovery)
- MPEC 2002-V06: S / 2001 J 2, 2001 J 3 November 1, 2002 (rediscovery)
- IAUC 8177: Satellites of Jupiter, Saturn, Uranus August 8, 2003 (numbering and naming)
| before | Jupiter moons | after that |
| Thyone | Hermippe |
Aitne |