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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[3][4] but was then lost.[5][6][7][8] It was recovered in 2017 and given its permanent designation that year.[9]
| Discovery | |
|---|---|
| Discovered by | Scott Sheppard et al. |
| Discovery date | 2003 |
| Designations | |
Designation | Jupiter LVII |
| Pronunciation | /aɪˈriːniː/ |
Named after | Εἰρήνη Eirēnē |
| S/2003 J 5 | |
| Adjectives | Eirenean /aɪrɪˈniːən/ |
| Orbital characteristics [1] | |
| 23731770 km | |
| Eccentricity | 0.2413 |
| −743.88 days[2] (2.038 years) | |
| Inclination | 162.713° (to the ecliptic) |
| Satellite of | Jupiter |
| Group | Carme group |
| Physical characteristics | |
| 4 km | |
| 22.5 | |
| 15.8[2] | |
Eirene is about 4 kilometres in diameter, and orbits Jupiter at an average distance of 23,974,000 km in 743.88 days, at an inclination of 166° to the ecliptic (167° to Jupiter's equator), in a retrograde direction and with an eccentricity of 0.307.
It belongs to the Carme group, made up of irregular retrograde moons orbiting Jupiter at a distance ranging between 23 and 24 Gm and at an inclination of about 165°.
The moon was named in 2019 after Eirene (Εἰρήνη), the daughter of Zeus and Themis and the goddess of peace in Greek mythology; the name originated from a naming contest held on Twitter with sixteen tweets suggesting the name, most significantly by users Quadrupoltensor (@Quadrupoltensor) who first suggested the name and PaulR (@PJRYYC).[10][11][12]
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