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Solar System Exploration
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Helike: Facts & Figures
   Back to Jupiter   Overview   Facts & Figures 
Discovered By
Scott Sander Sheppard
Date of Discovery
6 February 2003
Orbit Size Around Jupiter (semi-major axis)
Metric: 21,064,000 km
English: 13,088,563 miles
Periapsis (closest)
Metric: 17,973,911 km
Apoapsis (farthest)
Metric: 24,154,089 km
Sidereal Orbit Period (Length of Year)
1.714770705 Earth years
626.32 Earth days
By Comparison: Retrograde orbit
Orbit Circumference
Metric: 131,634,048.78 km
Average Orbit Velocity
Metric: 8,757.1 km/h
Orbit Eccentricity
0.1467
Orbit Inclination
154.621
By Comparison: Retrograde orbit
Mean Radius
Metric: 2.0 (assuming an albedo of 0.04) km
English: 1.2 miles
Equatorial Circumference
Metric: 12.6 km
Volume
Metric: 34 km3
Mass
Metric: 89,920,105,985,832 kg
Scientific Notation: 8.9920 x 1013 kg
Density
Metric: 2.6 g/cm3
Surface Area
Metric: 50.27 km2
Surface Gravity
Metric: 0.002 m/s2
Escape Velocity
Metric: 9 km/h

Additional Information:

-USGS Astrogeology: Gazetteer of Planetary Nomenclature: http://planetarynames.wr.usgs.gov/append7.html

-JPL Solar System Dynamics: http://ssd.jpl.nasa.gov/

-Solar System Moons: Discovery and Mythology by Jürgen Blunck; Springer-Verlag Berlin Heidelberg 2010

-Encyclopedia of the Solar System, second edition; edited by Lucy-Ann McFadden, Paul R. Weissman, and Torrence V. Johnson; Academic Press 2007

-Ellis Miner

-Encyclopædia Britannica Online. 2010: http://www.britannica.com
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Last Updated: 25 Mar 2011