National Aeronautics and Space Administration Logo
Follow this link to skip to the main content NASA Banner
Solar System Exploration
Planets
Ymir: Facts & Figures
   Back to Saturn   Overview   Facts & Figures   News 
Discovered By
Brett J. Gladman, John J. Kavelaars, Jean-Marc Petit, Hans Scholl, Matthew J. Holman, Brian G. Marsden, Phillip D. Nicholson, and Joseph A. Burns
Date of Discovery
2000
Orbit Size Around Saturn (semi-major axis)
Metric: 23,140,400 km
English: 14,378,778 miles
Periapsis (closest)
Metric: 15,418,449 km
Apoapsis (farthest)
Metric: 30,862,351 km
Orbit Circumference
Metric: 141,259,079.59 km
Average Orbit Velocity
Metric: 4,473.9 km/h
Orbit Eccentricity
0.3337
Orbit Inclination
171.661
By Comparison: Retrograde orbit
Mean Radius
Metric: 9.0 (assuming an albedo of 0.06) km
Equatorial Circumference
Metric: 56.5 km
Volume
Metric: 3,054 km3
Mass
Metric: 4,945,605,829,220,740 kg
Scientific Notation: 4.9456 x 1015 kg
Density
Metric: 2.3 g/cm3
Surface Area
Metric: 1,017.88 km2
Surface Gravity
Metric: 0.004 m/s2
Escape Velocity
Metric: 31 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

-"A deeper look at the colors of the Saturnian irregular satellites" by Tommy Grav and James Bauer http://arxiv.org/abs/astro-ph/0611590

-Edda by Snorri Sturluson, translated by Anthony Faulkes. Everyman Paperbacks, 1995
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: 4 Apr 2011