Solar System Exploration: Planets: Jupiter: Moons: Themisto: Facts & Figures

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Themisto

Facts & Figures

Themisto: Facts & Figures

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Overview

Facts & Figures

Discovered By

First time: Charles Thomas Kowal and Elizabeth Roemer
Second time: Scott Sander Sheppard, David C. Jewitt, Yanga Roland Fernández and Eugene A. Magnier

Date of Discovery

First time: 30 September 1975
Second time: 6 August 2000

Orbit Size Around Jupiter (semi-major axis)

Metric: 7,507,000 km

English: 4,664,634 miles

Periapsis (closest)

Metric: 5,687,303 km

Apoapsis (farthest)

Metric: 9,326,697 km

Sidereal Orbit Period (Length of Year)

0.355975359 Earth years

130.02 Earth days

Orbit Circumference

Metric: 46,467,175.95 km

Average Orbit Velocity

Metric: 14,891.0 km/h

Orbit Eccentricity

0.2424

Orbit Inclination

43.068

Mean Radius

Metric: 4.0 (assuming an albedo of 0.04) km

English: 2.5 miles

Equatorial Circumference

Metric: 25.1 km

Volume

Metric: 268 km³

Mass

Metric: 689,387,479,224,709 kg

Scientific Notation: 6.8939 x 10¹⁴ kg

Density

Metric: 2.6 g/cm³

Surface Area

Metric: 201.06 km²

Surface Gravity

Metric: 0.003 m/s²

Escape Velocity

Metric: 17 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

Dr. Ellis Miner, retired planetary scientist, Jet Propulsion Laboratory

NASA Official: Kristen Erickson

Advisory: Dr. James Green, Director of Planetary Science

Outreach Manager: Alice Wessen