Hydra
Natural satellite
>
&h=500&w=500&tbnid=zmbsk1cjQD006M&q=Hydra+(moon)&tbnh=225&tbnw=225&usg=AI4_-kQ2F36ojw7w3rvxd_ZzvhuZknmF9g&vet=1&docid=mXefnMKrT0yKDM&itg=1&sa=X&ved=2ahUKEwiA_Ynk8NyFAxVuDHkGHeF8DakQ9QF6BAgAEAQ)
&tbnh=105&tbnw=150&usg=AI4_-kSFD5k6O0cF_iSRXvGQKHF2QojRsQ&vet=1&docid=e5bzHw90OJ--YM&sa=X&ved=2ahUKEwiA_Ynk8NyFAxVuDHkGHeF8DakQ9QF6BAgAEAY)
&tbnh=99&tbnw=143&usg=AI4_-kSKB1qQNQnxXci9GTbmgw5v8mVlWQ&vet=1&docid=EmEetnGQIQldTM&sa=X&ved=2ahUKEwiA_Ynk8NyFAxVuDHkGHeF8DakQ9QF6BAgAEAg)
&tbnh=150&tbnw=112&usg=AI4_-kRSjvRom_iDLq-yM_NbrEbsadNeNw&vet=1&docid=Gtuc9nJOwII14M&sa=X&ved=2ahUKEwiA_Ynk8NyFAxVuDHkGHeF8DakQ9QF6BAgAEAo)
Hydra is a natural satellite of Pluto, with a diameter of approximately 51 km across its longest dimension. It is the second-largest moon of Pluto, being slightly larger than Nix. Wikipedia
Discovered: May 15, 2005
Discoverer: Marc Buie
Orbital period: 38 days
Gravity: 0.051 m/s²
Axial tilt: 110°
Eccentricity: 0.005862±0.000025
Inclination: 0.242°±0.005°