Hyrrokkin (moon)

Hyrrokkin (/hɪˈrɒkᵻn/ hirr-ROK-ən) or Saturn XLIV (provisional designation S/2004 S 19) is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on June 26, 2006, from observations taken between December 12, 2004, and April 30, 2006.

Hyrrokkin is about 8 kilometres in diameter,^[1] and orbits Saturn at an average distance of 18,168 Mm in 914 days, at an inclination of 153° to the ecliptic (154° to Saturn's equator), in a retrograde direction and with an eccentricity of 0.36. During four observations in March 2013, the synodic rotational period was measured by the Cassini spacecraft to approximately 12 hours and 45 minutes.

It was named in April 2007 after Hyrrokkin, a giantess from Norse mythology, who launched Hringhorni, Baldr's funeral ship. It was originally listed as being spelled Hyrokkin, but the spelling was later corrected.

References

↑ Rehnberg, Morgan (14 August 2015). "Cassini studies backwards-orbiting moon Hyrrokkin". Space Exploration Network. SEN. Retrieved 2015-08-17.

External links

Scott Sheppard's Saturnian satellites page
IAUC 8727: Satellites of Saturn June 30, 2006 (discovery)
MPEC 2006-M44: S/2004 S 19 June 26, 2006 (discovery and ephemeris)
IAUC 8826: Satellites of Jupiter and Saturn April 5, 2007 (Naming the moon)
IAUC 8860: Saturn XLIV (Hyrrokkin) July 31, 2007 (correcting the name)
Denk, T., Mottola, S. (2013): Irregular Saturnian Moon Lightcurves from Cassini-ISS Observations: Update. Abstract 406.08, DPS conference 2013, Denver (Colorado), October 10, 2013 (synodic rotation period)

Saturn

Geography	Dragon Storm Great White Spot Hexagon Magnetosphere Rings Diamonds

Moons	S/2009 S 1 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 Albiorix S/2007 S 2 Bebhionn Erriapus Skoll Siarnaq Tarqeq S/2004 S 13 Greip Hyrrokkin Jarnsaxa Tarvos 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

Astronomy	Delta Octantis Saturn-crossing minor planets

Exploration	Cassini–Huygens Enceladus Explorer Pioneer 11 Voyager program

Related	Fiction Saturn Moons

Natural satellites of the Solar System

Planetary
satellites

Other
satellites

Largest
satellites
(mean radius
≥ 100 km)

size	Ganymede largest / 2634 km / 0.413 Earths Titan Callisto Io Moon Europa Triton Titania Rhea Oberon Iapetus Charon Umbriel Ariel Dione Tethys [Dysnomia] Enceladus Miranda Proteus Mimas [Hi'iaka] Nereid Hyperion Phoebe smallest / 106 km / 0.017 Earths

abc's	Ariel Callisto Charon Dione [Dysnomia] Enceladus Europa Ganymede [Hi'iaka] Hyperion Iapetus Io Mimas Miranda Moon Nereid Oberon Phoebe Proteus Rhea Tethys Titan Titania Triton Umbriel

Discovery timeline
Inner moons
Irregular moons
List
Naming
Regular moons
Trojan moons
NOTE: Italicized moons are not close to being in hydrostatic equilibrium; [bracketed] moons may or may not be close to being in hydrostatic equilibrium.

Moons of Saturn

Temporary names in italics.

Ring shepherds	S/2009 S 1 Propeller moonlets Pan Daphnis Atlas Prometheus ?(S/2004 S 6 S/2004 S 4 S/2004 S 3) 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

Gallic group	Albiorix Bebhionn Erriapus Tarvos

Norse group	Phoebe Skathi S/2007 S 2 Skoll S/2004 S 13 Greip Hyrrokkin Mundilfari Jarnsaxa S/2006 S 1 S/2004 S 17 Narvi Bergelmir Aegir Suttungr S/2004 S 12 Bestla Farbauti Hati S/2004 S 7 Thrymr S/2007 S 3 S/2006 S 3 Surtur Kari Fenrir Ymir Loge Fornjot

Rings of Saturn Cassini–Huygens Themis Chiron In fiction

This article is issued from Wikipedia - version of the 9/8/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.