Setebos (moon)

Setebos

Discovery image of Setebos (encircled)
Discovery
Discovered by	John J. Kavelaars Brett J. Gladman Matthew J. Holman Jean-Marc Petit Hans Scholl
Discovery date	July 18, 1999
Designations
Designation	Uranus XIX
Pronunciation	/ˈsɛtɛbʌs/,[1] /-bɒs/[2]
Adjectives	Setebosian /ˌsɛtɛˈboʊsiən/[3]
Orbital characteristics
Mean orbit radius	17,418,000 km[4][5]
Eccentricity	0.5914[5]
Orbital period (sidereal)	2225.21 d
Inclination	158° (to the ecliptic)[4]
Satellite of	Uranus
Physical characteristics
Mean radius	24 km (estimate)[6] <50 km[7]
Surface area	~7200 km^2 (estimate)
Volume	~58,000 km^3 (estimate)
Mass	~7.5×10^16 kg (estimate)
Mean density	~1.3 g/cm^3 (assumed)
Surface gravity	~0.0063 m/s^2 (estimate)
Escape velocity	~0.0204 km/s (estimate)
Synodic rotation period	4.255 ± 0.017 h[7]
Axial tilt	?
Albedo	0.04 (assumed)[6]
Temperature	~65 K (estimate)

Setebos /ˈsɛtɛbʌs/ is one of the outermost retrograde irregular satellites of Uranus. It was discovered on 18 July 1999 by John J. Kavelaars et al. and provisionally designated S/1999 U 1.^[8]

Animation of discovery images taken in July 1999

Confirmed as Uranus XIX, it is named after the god worshipped by Caliban and Sycorax in William Shakespeare's play The Tempest.

The orbital parameters suggest that it may belong to the same dynamic cluster as Sycorax and Prospero, suggesting common origin.^[9] However, this suggestion does not appear to be supported by the observed colours. The satellite appears neutral (grey) in visible light (colour indices B−V = 0.77 , R−V = 0.35 ),^[10] similar to Prospero but different from Sycorax (which is light red).

A crater on Umbriel is also named after Setebos, but with the spelling Setibos.

See also

• Moons of Uranus
• Irregular satellites

References

1. Shakespeare Recording Society (1995) The Tempest (audio CD)
2. Benjamin Smith (1903) The Century Dictionary and Cyclopedia
3. Campbell, Pyre, Weaver (1932) Poetry and criticism of the romantic movement
4. Sheppard, Jewitt & Kleyna 2005, p. 523, Table 3.
5. Yeomans, Donald K. (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 2008-01-19.
6. Sheppard, Jewitt & Kleyna 2005, p. 523, Table 3 ... rⁱ (km) ... 24 ... ⁱ Radius of satellite assuming a geometric albedo of 0.04.
7. Farkas-Takács, A.; Kiss, Cs.; Pál, A.; Molnár, L.; Szabó, Gy. M.; Hanyecz, O.; et al. (September 2017). "Properties of the Irregular Satellite System around Uranus Inferred from K2, Herschel, and Spitzer Observations". The Astronomical Journal. 154 (3): 13. arXiv:1706.06837. Bibcode:2017AJ....154..119F. doi:10.3847/1538-3881/aa8365. S2CID 118869078. 119.
8. Gladman, B. J.; Kavelaars, J. J.; Holman, M. J., Petit, J.-M.; Scholl, H.; Nicholson, P. D.; and Burns, J. A.; The Discovery of Uranus XIX, XX, and XXI, Icarus, 147 (2000), pp. 320–324
9. Grav, Tommy; Holman, Matthew J.; Gladman, Brett J.; and Aksnes, Kaare; Photometric survey of the irregular satellites, Icarus, 166, (2003), pp. 33–45. arXiv:astro-ph/0301016
10. Grav, Holman & Fraser 2004.

• Grav, Tommy; Holman, Matthew J.; Fraser, Wesley C. (2004-09-20). "Photometry of Irregular Satellites of Uranus and Neptune". The Astrophysical Journal. 613 (1): L77 – L80. arXiv:astro-ph/0405605. Bibcode:2004ApJ...613L..77G. doi:10.1086/424997. S2CID 15706906.
• Sheppard, S.S.; Jewitt, D.; Kleyna, J. (2005). "An ultradeep survey for irregular satellites of Uranus: Limits to completeness". The Astronomical Journal. 129 (1): 518–525. arXiv:astro-ph/0410059. Bibcode:2005AJ....129..518S. doi:10.1086/426329. S2CID 18688556.

External links

• "Setebos" (profile). Archived from the original on 2007-06-09. via "Solar System Exploration". NASA.
• Jewitt, D.C. (c. 2008). "Hawaii Irregular Satellites Survey". Uranus' moons. David Jewitt pages. University of Hawaii. Archived from the original on 2008-12-26. Retrieved 2023-08-03.
• Sheppard, S.S. "Uranus' known satellites".
• "Natural satellites". Ephemeris service. Minor Planet Center (MPC). Harvard–Smithsonian Center for Astrophysics (CfA).