Eirene (moon)
Eirene /aɪˈriːniː/, also Jupiter LVII and originally known as S/2003 J 5, is a retrograde irregular satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2003 but was then lost. It was recovered in 2017 and given its permanent designation that year.
| Discovery | |
|---|---|
| Discovered by | Scott Sheppard et al. |
| Discovery date | 2003 |
| Designations | |
Designation | Jupiter LVII |
| Pronunciation | /aɪˈriːniː/ |
Named after | Εἰρήνη Eirēnē |
Alternative names | S/2003 J 5 |
| Adjectives | Eirenean /aɪrɪˈniːən/ |
| Orbital characteristics | |
Semi-major axis | 23731770 km |
| Eccentricity | 0.2413 |
Orbital period (sidereal) | −743.88 days (2.038 years) |
| Inclination | 162.713° (to the ecliptic) |
| Satellite of | Jupiter |
| Group | Carme group |
| Physical characteristics | |
Mean diameter | 4 km |
| 22.5 | |
| 15.8 | |
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