The Small Moons of Saturn

Hyperion, Helene, Calypso, Janus, Epimetheus, Pandora, Prometheus

Hyperion

Constants

•  Mean Radius:               112 x 180 km       

•  Mass:                      ? (Earth=1)        

•  Density:                   ? (g/cm^3)         

•  Gravity:                   ? (Earth=1)        

•  Orbit Period:              21.277 (Earth days)

•  Rotation Period:           21.277 (Earth days)

•  Semimajor Axis of Orbit:   1,481,000 km       

•  Eccentricity of Orbit:     0.104              

Hyperion Nomenclature

Official names of features on Hyperion as approved by the International Astronomical Union.

Helene

Constants

•  Mean Radius:               16 km            

•  Mass:                      ? (Earth=1)        

•  Density:                   ? (g/cm^3)         

•  Gravity:                   ? (Earth=1)        

•  Orbit Period:              2.739 (Earth days) 

•  Rotation Period:           ? (Earth days)     

•  Semimajor Axis of Orbit:   378,060 km         

•  Eccentricity of Orbit:     0.005              

Calypso

Constants

•  Mean Radius:               8 x 15 km         

•  Mass:                      ? (Earth=1)       

•  Density:                   ? (g/cm^3)        

•  Gravity:                   ? (Earth=1)       

•  Orbit Period:              1.888 (Earth days)

•  Rotation Period:           1.888 (Earth days)

•  Semimajor Axis of Orbit:   294,670 km        

•  Eccentricity of Orbit:     (0)               

Janus

Constants

•  Mean Radius:               77 x 97 km        

•  Mass:                      ? (Earth=1)       

•  Density:                   ? (g/cm^3)        

•  Gravity:                   ? (Earth=1)       

•  Orbit Period:              0.695 (Earth days)

•  Rotation Period:           ? (Earth days)    

•  Semimajor Axis of Orbit:   151,472 km        

•  Eccentricity of Orbit:     0.007             

Janus Nomenclature

Official names of features on Janus as approved by the International Astronomical Union.

Epimetheus

Constants

•  Mean Radius:               55 x 69 km        

•  Mass:                      ? (Earth=1)       

•  Density:                   ? (g/cm^3)        

•  Gravity:                   ? (Earth=1)       

•  Orbit Period:              0.694 (Earth days)

•  Rotation Period:           ? (Earth days)    

•  Semimajor Axis of Orbit:   151,422 km        

•  Eccentricity of Orbit:     0.009             

Epimetheus Nomenclature

Official names of features on Epimetheus as approved by the International Astronomical Union.

Pandora

Constants

•  Mean Radius:               31 x 55 km        

•  Mass:                      ? (Earth=1)       

•  Density:                   ? (g/cm^3)        

•  Gravity:                   ? (Earth=1)       

•  Orbit Period:              0.629 (Earth days)

•  Rotation Period:           ? (Earth days)    

•  Semimajor Axis of Orbit:   141,700 km        

•  Eccentricity of Orbit:     0.004             

Prometheus

Constants

•  Mean Radius:               34 x 74 km        

•  Mass:                      ? (Earth=1)       

•  Density:                   ? (g/cm^3)        

•  Gravity:                   ? (Earth=1)       

•  Orbit Period:              0.613 (Earth days)

•  Rotation Period:           ? (Earth days)    

•  Semimajor Axis of Orbit:   139,350 km        

•  Eccentricity of Orbit:     0.005