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Rhea

Cassini view of Rhea's anti-Saturnian hemisphere, showing the moon's two largest impact basins (Mamaldi above and left of center, and adjacent Tirawa to its upper right). At highest resolution, several long linear features are visible: halfway down from center is Harahvaiti Fossa, while near the limb left of the bottom is Koykamou Catena.

Discovery

Discoveredby

G. D. Cassini

Discoverydate

December 23, 1672

Designations

Alternative names

Saturn V

Adjectives

Rhean

Orbital characteristics ^[1]

527108 km

0.0012583

4.518212 d

0.345° (to Saturn's equator)

Satelliteof

Saturn

Physical characteristics

Dimensions

1532.4×1525.6×1524.4 km

Mean radius

763.8 ± 1.0km

Surface area

7337000 km²

Mass

(2.306518±0.000353)×10²¹ kg (~3.9×10⁻⁴ Earths)

Mean density

1.236 ± 0.005g/cm³

Surface gravity

0.265 m/s²

Escape velocity

0.635 km/s

Rotation period

4.518212 d
(synchronous)

Axial tilt

zero

Albedo

0.949 ± 0.003 (geometric)

Surface temp.	min	mean	max
Kelvin	53 K	99 K

Apparent magnitude

10 ^[2]

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Photo of Rhea taken by the Cassini-Huygens probe

Rhea (/ˈriːə/;^[a] Ancient Greek: Ῥέᾱ) is Saturn's second largest moon. It is made of ice and rock.

Ring system

[change | change source]

Rhea may have a thin ring system with three narrow bands in a disk of solid particles. These would be the first rings seen around a moon. The discovery was announced in the journal Science on March 6, 2008.

Notes

[change | change source]

↑ In US dictionary transcription, USdict:rē′·ə.

References

[change | change source]

👁 Image

Wikimedia Commons has media related to Rhea.

↑ Natural Satellites Ephemeris Service Minor Planet Center
↑ Observatorio ARVAL (April 15, 2007). "Classic Satellites of the Solar System". Observatorio ARVAL. Archived from the original on 2013-10-22. Retrieved 2011-12-17.

v t e Moons of Saturn
Listed in approximately increasing distance from Saturn. Temporary names in italics.
Ring shepherds	S/2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus Pandora
Co-orbitals	Epimetheus Janus
G Ring	Aegaeon
Mimas and Alkyonides	Mimas Methone Anthe Pallene
Inner large (with trojans)	Enceladus Tethys Telesto Calypso Dione Helene Polydeuces
Outer large	Rhea Titan Hyperion Iapetus
Inuit group	Kiviuq Ijiraq Paaliaq Siarnaq Tarqeq
Norse group	Phoebe Skathi S/2007 S 2(?) Skoll S/2004 S 13(?) Greip Hyrrokkin Jarnsaxa Mundilfari S/2006 S 1(?) S/2004 S 17(?) Bergelmir Narvi Suttungr Hati S/2004 S 12(?) Farbauti Thrymr Aegir S/2007 S 3(?) Bestla S/2004 S 7(?) S/2006 S 3 Fenrir Surtur Kari Ymir Loge Fornjot
Gallic group	Albiorix Bebhionn Erriapus Tarvos
Rings of Saturn Cassini–Huygens Themis Chiron S/2004 S 6 S/2004 S 4 S/2004 S 3 In fiction

Solar System

👁 Image

Planets, dwarfs, minors	Terrestrials Mercury Venus Earth Mars Giants Gas Jupiter Saturn Ice Uranus Neptune Dwarfs Ceres Orcus Pluto Haumea Quaoar Makemake Gonggong Eris Sedna Large Minor Planets Salacia Varuna Ixion List
Moons	Earth Moon Claimed Mars Phobos Deimos Jupiter Ganymede Callisto Io Europa Saturn Titan Rhea Iapetus Dione Tethys Enceladus Mimas Hyperion Phoebe Uranus Titania Oberon Umbriel Ariel Miranda Neptune Triton Proteus Nereid Pluto Charon Nix Hydra Kerberos Styx Orcus Vanth Haumea Hiʻiaka Namaka Quaoar Weywot Makemake S/2015 (136472) 1 Gonggong Xiangliu Eris Dysnomia
Exploration (outline)	Colonization Discovery astronomy historical models timeline Space probes timeline list Human spaceflight space stations list programs Mercury Venus Moon mining Mars Ceres Asteroids mining Comets Jupiter Saturn Uranus Neptune Pluto Deep space
Hypothetical objects	Bagby's moon Chiron Coatlicue Counter-Earth Chrysalis Fifth Giant Hyperion Lilith Mercury's moon Neith Nemesis Nibiru Petit's moon Phaeton Planet Nine Planet Ten Planet V Planet X Subsatellites Synestia Theia Themis Tyche Vulcan Vulcanoids Waltemath's moons
Lists	Comets Possible dwarf planets Gravitationally rounded objects Minor planets Natural satellites Solar System models Solar System objects by size by discovery date Interstellar and circumstellar molecules

Rings	Planetary Jovian Saturnian(Rhean?) Uranian Neptunian Minor objects' Charikloan Chironean Haumean Quaoarian
Formation, evolution, contents, and History	Star formation Accretion Accretion disk Excretion Capture theory Capture of Triton Circumplanetary disk Circumstellar disc Circumstellar envelope Coatlicue Co-orbital configuration Trojan_moons Co-orbital moons Cosmic dust Debris disk Detached object Disk instability EXCEDE Exozodiacal dust Extraterrestrial materials Curation Sample-return mission Frost/Ice/Snow line Giant-impact hypothesis Grand tack hypothesis Gravitational collapse Hills cloud Hill sphere Interplanetary dust cloud Interplanetary medium/space Interstellar cloud Interstellar medium Interstellar space Kordylewski cloud Kuiper belt Kuiper cliff Late Heavy Bombardment Molecular cloud Nebular hypothesis Nice model Nice 2 model Five-planet Nice model Oort cloud Outer space Planet Disrupted Migration System Planetesimal Formation Merging stars Protoplanetary disk Ring system Roche limit vs. Hill sphere Rubble pile Scattered disc
Small Solar System bodies	Asteroid belt Asteroids Ceres Vesta Pallas Hygiea active List families PHA exceptional Kirkwood gap Centaurs Comets Damocloids Meteoroids Minor planets names and meanings moons Planetesimal Planetary orbit-crossers Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Trojans Venus Earth Mars Jupiter Trojan camp Greek camp Saturn Uranus Neptune Near-Earth objects NEAs Trans-Neptunian objects Kuiper belt Cubewanos Plutinos Detached objects Sednoids Scattered disc Hills cloud Oort cloud
Related	Double planet Lagrange point Moonlet Syzygy Tidal locking

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Category:

Saturn's moons

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Ring system

Notes

References