National Aeronautics and Space Administration Logo
Follow this link to skip to the main content NASA Banner
Solar System Exploration
Planets
Helene: Facts & Figures
   Back to Saturn   Overview   Gallery   Facts & Figures   News 
Discovered By
P. Laques, J. Lecacheus
Date of Discovery
1 March 1980
Orbit Size Around Saturn (semi-major axis)
Metric: 377,420 km
English: 234,518 miles
Periapsis (closest)
Metric: 374,740 km
Apoapsis (farthest)
Metric: 380,100 km
Orbit Circumference
Metric: 2,371,369.91 km
Average Orbit Velocity
Metric: 36,100.5 km/h
Orbit Eccentricity
0.0071
Orbit Inclination
0.213 degree
Mean Radius
Metric: 17.6 km
By Comparison: 18 x 16 x 15 km, tri-axial
Equatorial Circumference
Metric: 110.6 km
Volume
Metric: 22,836 km3
Mass
Metric: 11,389,880,091,538,700 kg
Scientific Notation: 1.1390 x 1016 kg
Density
Metric: 0.5 g/cm3
Surface Area
Metric: 3,892.56 km2
Surface Gravity
Metric: 0.002 m/s2
Escape Velocity
Metric: 33 km/h
Awards and Recognition   Solar System Exploration Roadmap   Contact Us   Site Map   Print This Page
NASA Official: Kristen Erickson
Advisory: Dr. James Green, Director of Planetary Science
Outreach Manager: Alice Wessen
Curator/Editor: Phil Davis
Science Writer: Autumn Burdick
Producer: Greg Baerg
Webmaster: David Martin
> NASA Science Mission Directorate
> Budgets, Strategic Plans and Accountability Reports
> Equal Employment Opportunity Data
   Posted Pursuant to the No Fear Act
> Information-Dissemination Policies and Inventories
> Freedom of Information Act
> Privacy Policy & Important Notices
> Inspector General Hotline
> Office of the Inspector General
> NASA Communications Policy
> USA.gov
> ExpectMore.gov
> NASA Advisory Council
> Open Government at NASA
Last Updated: 12 Aug 2013