Thrymr (moon)

Thrymr
	Discovery images of Thrymr (cirlced) taken by the CFHT in September 2000
Discovery
Discovery date	2000
Designations
Designation	Saturn XXX
Pronunciation	/ˈθrɪmər/[1]
Named after	Thrymr
Alternative names	S/2000 S 7
Adjectives	Thrymian /ˈθrɪmiən/
Orbital characteristics [2]
Semi-major axis	20474000 km
Eccentricity	0.470
Orbital period	−1094.3 days
Inclination	176.0°
Satellite of	Saturn
Group	Norse group
Physical characteristics
Mean diameter	8+50%; −30% km[3]
Rotation period	38.79±0.25? h[3]
Apparent magnitude	23.9

Thrymr /ˈθrɪmər/, or Saturn XXX, is a natural satellite of Saturn. It was discovered by Gladman and colleagues in 2000, and given the temporary designation S/2000 S 7. Its name comes from Norse mythology, where Thrymr is a Jotun.

Thrymr is about 7 kilometres in diameter, and orbits Saturn at an average distance of 20,810 Mm in 1120.809 days. It may have formed from debris knocked off Phoebe. The Thrymian orbit is retrograde, at an inclination of 175° to the ecliptic (151° to Saturn's equator) and with an eccentricity of 0.453. Its rotation period is 38.79±0.25 hours.[3]

Its name was announced in its oblique form Thrym in IAU Circular 8177. However, the IAU Working Group on Planetary System Nomenclature later decided to add the nominative suffix -r to the root Thrym.

References

/ˈθrɪm/ for 'Thrym-' in Merriam-Webster's Encyclopedia of Literature (1995)
S.S. Sheppard (2019), Moons of Saturn, Carnegie Science, on line
Denk, T.; Mottola, S. (2019). Cassini Observations of Saturn's Irregular Moons (PDF). 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute.

IAUC 7538: S/2000 S 7, S/2000 S 8, S/2000 S 9 December 7, 2000 (discovery)
MPEC 2000-Y15: S/2000 S 1, S/2000 S 2, S/2000 S 7, S/2000 S 8, S/2000 S 9 December 19, 2000 (discovery and ephemeris)
IAUC 8177: Satellites of Jupiter and Saturn August 8, 2003 (naming the moon Thrym)
IAUC 8471: Satellites of Saturn, January 21, 2005 (correcting the name)

Moons of Saturn
Listed in approximately increasing distance from Saturn as of epoch JD 2459200.5.
Ring shepherds	S/2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus Pandora
Co-orbitals	Epimetheus Janus
G Ring	Aegaeon
Alkyonides	Methone Anthe Pallene
Inner large (with trojans)	Mimas Enceladus Tethys Telesto Calypso Dione Helene Polydeuces
Outer large	Rhea Titan Hyperion Iapetus
Inuit group (7)	Kiviuq Ijiraq Paaliaq S/2004 S 29 S/2004 S 31 Tarqeq Siarnaq
Norse group (46)	Phoebe Skathi S/2004 S 37 S/2007 S 2 Skoll Hyrrokkin Greip Mundilfari S/2004 S 13 (?) S/2006 S 1 S/2007 S 3 (?) Suttungr S/2004 S 20 Jarnsaxa Narvi Bergelmir Hati S/2004 S 17 (?) S/2004 S 12 (?) S/2004 S 27 Farbauti Thrymr Bestla S/2004 S 7 (?) Aegir S/2004 S 30 S/2004 S 22 S/2004 S 25 S/2004 S 32 S/2004 S 23 S/2006 S 3 S/2004 S 35 Kari S/2004 S 28 Loge S/2004 S 38 Fenrir Ymir Surtur S/2004 S 33 S/2004 S 21 S/2004 S 39 S/2004 S 36 Fornjot S/2004 S 34 S/2004 S 26
Gallic group (4)	Albiorix Bebhionn Erriapus Tarvos
Prograde outer satellites	S/2004 S 24
Rings of Saturn Cassini–Huygens Themis Chiron S/2004 S 6 S/2004 S 4 S/2004 S 3 In fiction

Saturn
Outline of Saturn
Geography	Dragon Storm Great White Spot Hexagon Magnetosphere Rings
Moons	S/2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus S/2004 S 6 S/2004 S 4 S/2004 S 3 Pandora Epimetheus Janus Aegaeon Mimas Methone Anthe Pallene Enceladus Tethys Telesto Calypso Dione Helene Polydeuces Rhea Titan Hyperion Iapetus Kiviuq Ijiraq Phoebe Paaliaq Skathi S/2004 S 37 Albiorix S/2007 S 2 S/2004 S 29 Bebhionn Erriapus Skoll S/2004 S 31 Siarnaq Tarqeq S/2004 S 13 Greip Hyrrokkin Jarnsaxa Tarvos Mundilfari S/2006 S 1 S/2004 S 17 Bergelmir Narvi S/2004 S 20 Suttungr Hati S/2004 S 12 S/2004 S 27 Farbauti Thrymr S/2004 S 30 Aegir S/2007 S 3 Bestla S/2004 S 7 S/2004 S 22 S/2004 S 23 S/2004 S 25 S/2004 S 32 S/2006 S 3 S/2004 S 38 Fenrir S/2004 S 28 Surtur Kari S/2004 S 35 Ymir S/2004 S 21 S/2004 S 24 Loge S/2004 S 36 S/2004 S 39 S/2004 S 33 S/2004 S 34 Fornjot S/2004 S 26
Astronomy	Delta Octantis Saturn-crossing minor planets
Exploration	Cassini–Huygens (Huygens) timeline retirement Pioneer 11 Voyager program Voyager 1 Voyager 2
Related	Fiction Moons The Day the Earth Smiled In Saturn's Rings (2018 documentary)

Thrymr (moon)

References

Further reading