Fornjot (moon)

Fornjot
Discovery
Fornjot imaged by the Cassini spacecraft in March 2014
Discovered by	Scott S. Sheppard David C. Jewitt Jan T. Kleyna Brian G. Marsden
Discovery date	December 2004
Designations
Designation	Saturn XLII
Pronunciation	/ˈfɔːrnjoʊt/ Icelandic: [ˈfɔ(r)tnˌjouːt]
Named after	Fornjót
Alternative names	S/2004 S 8
Orbital characteristics^[1]
Semi-major axis	25108000 km
Eccentricity	0.206
Orbital period (sidereal)	−1490.9 days
Inclination	170.4°
Satellite of	Saturn
Group	Norse group
Physical characteristics^[2]^[3]
Mean diameter	6+50% −30% km
Synodic rotation period	(6.9 or 9.5) ± 0.4? h
Albedo	0.06 (assumed)
Apparent magnitude	24.6
Absolute magnitude (H)	14.9

Fornjot /ˈfɔːrnjoʊt/ or Saturn XLII is the outermost named moon of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on 4 May 2005 from observations taken between 12 December 2004, and 11 March 2005. It had the largest semi-major axis among all the known moons of Saturn^[3]

It is about 6 kilometres in diameter, and it orbits Saturn at an average distance of 23,609 Mm in 1491 d at an inclination of 168° to the ecliptic (160° to Saturn's equator) in a retrograde direction and with an eccentricity of 0.186. It is ambiguous whether the rotation period is 6.9 or 9.5±0.4 hours, but it is known to show very little variation in brightness and is probably very round in shape. It was also the faintest moon that was measured by Cassini–Huygens.^[2]^[3]

Fornjot was named after Fornjót, a giant in Norse mythology.

References

^ S.S. Sheppard (2019), Moons of Saturn, Carnegie Science, on line
^ ^a ^b Denk, T.; Mottola, S. (2019). Cassini Observations of Saturn's Irregular Moons (PDF). 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute.
^ ^a ^b ^c Denk, Tilmann; Mottola, Stefano; Tosi, Frederico; Bottke, William F.; Hamilton, Douglas P. (2018). "The Irregular Satellites of Saturn" (PDF). In Schenk, P.M.; Clark, R.N.; Howett, C.J.A.; Verbiscer, A.J.; Waite, J.H. (eds.). Enceladus and the Icy Moons of Saturn. Space Science Series. Vol. 322. Tucson, AZ: The University of Arizona Press. pp. 409–434. Bibcode:2018eims.book..409D. doi:10.2458/azu_uapress_9780816537075-ch020. ISBN 9780816537075.

External links

Institute for Astronomy Saturn Satellite Data
Jewitt's New Satellites of Saturn page
IAUC 8523: New Satellites of Saturn May 4, 2005 (discovery)
MPEC 2005-J13: Twelve New Satellites of Saturn May 3, 2005 (discovery and ephemeris)
IAUC 8826: Satellites of Jupiter and Saturn April 5, 2007 (naming the moon)

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Related	Fiction The Day the Earth Smiled In Saturn's Rings (2018 documentary)
Category

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Moons of Saturn

Listed in approximately increasing distance from Saturn

Ring moonlets

Ring shepherds

Other inner moons

Alkyonides

Large moons
(with trojans)

Inuit group (12)

Kiviuq subgroup	S/2019 S 1 Kiviuq S/2005 S 4 S/2020 S 1 Ijiraq
Paaliaq subgroup	Paaliaq
Siarnaq subgroup	S/2004 S 31 Tarqeq Siarnaq S/2019 S 14 S/2020 S 3 S/2020 S 5

Gallic group (7)

Norse group (100)

Phoebe subgroup	Phoebe S/2006 S 20 S/2006 S 9

Skathi
S/2007 S 5
S/2007 S 7
S/2007 S 2
S/2004 S 37
S/2004 S 47
S/2004 S 40
S/2019 S 2
S/2019 S 3
S/2020 S 7
Skoll
S/2020 S 2
S/2019 S 4
S/2004 S 41
S/2004 S 42
Hyrrokkin
Greip
S/2004 S 13
S/2007 S 6
Mundilfari
S/2006 S 1
S/2004 S 43
S/2006 S 10
S/2019 S 5
Gridr
Bergelmir
Jarnsaxa
Narvi
Suttungr
S/2007 S 3
S/2004 S 44
S/2004 S 45
Hati
S/2004 S 17
S/2006 S 11
S/2004 S 12
Eggther
S/2006 S 13
S/2007 S 9
S/2019 S 7
S/2019 S 8
Farbauti
Thrymr
Bestla
S/2019 S 9
S/2004 S 46
Angrboda
S/2019 S 11
Aegir
Beli
S/2019 S 10
S/2019 S 12
Gerd
S/2019 S 13
S/2006 S 14
Gunnlod
S/2019 S 15
S/2020 S 6
S/2004 S 7
S/2006 S 3
S/2005 S 5
Skrymir
S/2006 S 16
S/2006 S 15
S/2004 S 28
S/2020 S 8
Alvaldi
Kari
S/2004 S 48
Geirrod
Fenrir
S/2004 S 50
S/2006 S 17
S/2004 S 49
S/2019 S 17
Surtur
S/2006 S 18
Loge
Ymir
S/2019 S 19
S/2004 S 21
S/2019 S 18
S/2004 S 39
S/2019 S 16
S/2004 S 53
S/2004 S 36
Thiazzi
S/2019 S 20
S/2006 S 19
Saturn LXIV
Fornjot
S/2004 S 51
S/2020 S 10
S/2020 S 9
Saturn LVIII
S/2019 S 21
S/2004 S 52

Outlier prograde
irregular moons

S/2006 S 12

S/2019 S 6

S/2004 S 24

This page was last edited on 11 April 2024, at 04:26

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References

External links