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Hyrrokkin (moon)

Moon of Saturn

Field	Value
name	Hyrrokkin
image	Hyrrokkin-cassini.png
caption	Hyrrokkin imaged by the Cassini spacecraft in March 2013
mpc_name	Saturn XLIV
alt_names	S/2004 S 19
discovered	December 2004
discoverer	Scott S. Sheppard
David C. Jewitt
Jan T. Kleyna
Brian G. Marsden
named_after	Hyrrokkin
orbit_ref
semimajor
inclination	151°
eccentricity	0.3
period	−931.8 days
satellite_of	Saturn
group	Norse group
physical_ref
mean_diameter
rotation	h
albedo	0.06 (assumed)
spectral_type	g – r = 0.50 ± 0.08, r – i = 0.34 ± 0.09
magnitude	23.5
abs_magnitude	14.3

David C. Jewitt Jan T. Kleyna Brian G. Marsden

Hyrrokkin or Saturn XLIV 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, 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 0.3582. During four observations in March 2013, the synodic rotational period was measured by the Cassini spacecraft to approximately 12 hours and 45 minutes. The rotation period was later refined to hours. Its light curve shows three minima as seen in Ymir and Siarnaq, but has one minimum much shallower than the others. The rotation period and orbit are similar to Greip's, with only the inclination being appreciably different, but it is not known whether the moons are closely related to each other.

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

[https://sites.google.com/carnegiescience.edu/sheppard/moons/saturnmoons S.S. Sheppard (2019), Moons of Saturn, ''Carnegie Science'', on line]
(2022-05-17). "Colors of Irregular Satellites of Saturn with the Dark Energy Camera". The Astronomical Journal.
Rehnberg, Morgan. (14 August 2015). "Cassini studies backwards-orbiting moon Hyrrokkin". SEN.
(2019). "Cassini Observations of Saturn's Irregular Moons". [[Lunar and Planetary Institute]].
(2018). "Enceladus and the Icy Moons of Saturn". [[The University of Arizona Press]].

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moons-of-saturn norse-group irregular-satellites discoveries-by-scott-s.-sheppard astronomical-objects-discovered-in-2006 moons-with-a-retrograde-orbit

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