Tarqeq

Tarqeq, also known as Saturn LII (provisional designation S/2007 S 1) is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on 13 April 2007 from observations taken between 5 January 2006 and 22 March 2007.^[1][2] It is named after Tarqeq, the Inuit moon god,^[6] and is a member of the Inuit group of irregular satellites. It is about six kilometres in diameter. The Cassini spacecraft observed Tarqeq over 1.5 days on 15–16 January 2014.

Tarqeq

Tarqeq imaged by the Cassini spacecraft in June 2016
Discovery[1][2]
Discovered by	Scott S. Sheppard David C. Jewitt Jan Kleyna Brian G. Marsden
Discovery date	13 April 2007
Designations
Designation	Saturn LII
Pronunciation	/ˈtɑːrkɛk/
Named after	Tarqiup Inua
Alternative names	S/2007 S 1
Adjectives	Tarqiupian, Tarqeqian[a]
Orbital characteristics[1]
Epoch 2007 Apr. 10.0
Semi-major axis	17.9106 Gm
Eccentricity	0.1081
Orbital period (sidereal)	894.86 d
Inclination	49.90°
Satellite of	Saturn
Group	Inuit group (Siarnaq)
Physical characteristics[3][4]
Mean diameter	6+50% −30% km
Synodic rotation period	76.13±0.01 h
Albedo	0.06 (assumed)
Spectral type	B–R = 1.37 ± 0.06[5]
Apparent magnitude	23.9
Absolute magnitude (H)	14.8

The Tarqiupian (Tarqeqian)^[a] orbit lies at an inclination of 49.90° (to the ecliptic; 49.77° to Saturn's equator), with an eccentricity of 0.1081^[1] and a semi-major axis of 17.9106 Gm. Tarqeq orbits in a prograde direction with a period of 894.86 days.

Tarqeq is the slowest-rotating irregular moon measured by Cassini–Huygens, with a period of about 76.13±0.01 h and a roughly ellipsoidal shape.^[3] This is very close to a 1:5 resonance with Titan's orbital period, suggesting that gravitational interactions possibly lock Tarqeq in a mean-motion resonance.^[4]

It has very similar inclination and semi-major axis as Siarnaq, suggesting that it is a fragment of the latter.^[4]

Notes

1. The genitive form of Tarqeq is Tarqiup (as in Tarqiup Inua 'Master of the Moon'). Thus the adjectival form could be absolutive Tarqeqian or genitive Tarqiupian, parallel to nominative Venusian and genitive Venerian for Venus. See Inuktitut morphology

References

1. MPEC 2007-G38: S/2007 S 1 13 April 2007 (discovery, prediscovery and ephemeris)
2. IAUC 8836: S/2007 S 1, S/2007 S 2, and S/2007 S 3 11 May 2007 (discovery)
3. Denk, T.; Mottola, S. (2019). Cassini Observations of Saturn's Irregular Moons (PDF). 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute.
4. 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.
5. Graykowski, Ariel; Jewitt, David (2018-04-05). "Colors and Shapes of the Irregular Planetary Satellites". The Astronomical Journal. 155 (4): 184. arXiv:1803.01907. doi:10.3847/1538-3881/aab49b. ISSN 1538-3881.
6. IAUC 8873: Satellites of Saturn 20 September 2007 (naming)

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