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 diameter	47 km <50 km[6]
Synodic rotation period	4.255 ± 0.017 h[6]
Albedo	0.04 (Assumed) >0,03 [6]
Apparent magnitude	23,3
Absolute magnitude (H)	10,6

Setebos /ˈsɛtɛbʌs/ also known as Uranus XIX is a one of the largest retrograde irregular satellite of Uranus

Animation of discovery images taken in July 1999

Discovery and Naming

It was discovered on 18 July 1999 by John J. Kavelaars et al. and provisionally designated S/1999 U 1.^[7]

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

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

Orbit

Setebos orbits Uranus at an average distance of 16,256,000 km, in 1978 days, at an inclination of about 152° to the ecliptic, in a retrograde direction and with an high eccentricity of 0.445. The orbital elements are continuously changing due to solar and planetary perturbations.

Physical characteristics

Setebos estimated diameter is 47 kilometers, assuming an albedo of 4%.

The satellite appears neutral (grey) in visible light (colour indices B−V=0.77, R−V=0.35),^[8] similar to Prospero.

Measurements of Setebos's light curve by the Kepler space telescope indicate that its rotation period is about 4 hours and 15,3min.^[6] which makes it one of the fastest-rotating moons in our solar system.

Origin

Setebos probably did not form near Uranus but was captured by Uranus later. The orbital parameters suggest that it may belong to the same dynamic cluster as Sycorax and Prospero, suggesting a common origin.^[9] However, Sycorax has a much redder color than the other moons, which tend to be gray in color.

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. 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.
7. 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), pages 320–324
8. Grav, Holman & Fraser 2004.
9. Grav, Tommy; Holman, Matthew J.; Gladman, Brett J.; Aksnes, Kaare Photometric survey of the irregular satellites, Icarus, 166, (2003), pp. 33–45. arXiv:astro-ph/0301016

• 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 Hawaiʻi. 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).