Aegaeon (moon)
Aegaeon /iːˈdʒiːɒn/, or Saturn LIII (provisional designation S/2008 S 1), is a natural satellite of Saturn. It has an extremely elongated shape whose surface is thought to be similarly smooth as Methone. It orbits between Janus and Mimas within Saturn's G Ring.
Aegaeon's crescent imaged by the Cassini spacecraft from a distance of 15238.2 km in 2010 | |
| Discovery | |
|---|---|
| Discovered by | Carolyn Porco |
| Discovery date | March 3, 2009 |
Detection method | Cassini Imaging Science Team |
| Designations | |
Designation | Saturn LIII |
| Pronunciation | /iːˈdʒiːɒn/ |
Named after | Αιγαίων Aigaiōn |
| Adjectives | Aegaeonian /iːdʒiːˈoʊniən/ |
| Orbital characteristics | |
| Epoch JD 2454467.00075444 TDB | |
Semi-major axis | 167493.665±0.004 km |
| Eccentricity | 0.00042277±0.00000004 |
Orbital period (sidereal) | 0.80812 d |
| Inclination | 0.0007°±0.6° |
| Satellite of | Saturn |
| Group | Source of the G Ring |
| Physical characteristics | |
| Dimensions | 1.40 × 0.50 × 0.40 km (± 0.10 × 0.12 × 0.16 km): 2 |
Mean diameter | 0.66±0.12 km: 2 |
| Volume | 0.15 km3 |
| Mass | (7.82±3.00)×1010 kg: 3 |
Mean density | 0.539±0.140 g/cm3: 3 |
Surface gravity | 0.009–0.013 mm/s2: 3 (0.9–1.3 micro-g) |
| 0.001 km/s at longest axis to 0.002 km/s at poles | |
Synodic rotation period | assumed synchronous |
| Albedo | < 0.15 |
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