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Bebhionn
	Bebhionn imaged by the Cassini spacecraft in May 2017
Discovery
Discovered by	Scott S. Sheppard; David C. Jewitt; Jan T. Kleyna; Brian G. Marsden
Discovery date	2004
Designations
Designation	Saturn XXXVII
Pronunciation	/ˈbeɪvɪn, ˈbɛviɒn/ BAY-vin, BEV-ee-on
Named after	Béibhinn
Alternative names	S/2004 S 11
Orbital characteristics
Semi-major axis	17119000 km
Eccentricity	0.469
Orbital period (sidereal)	−834.8 days
Inclination	35.01°
Satellite of	Saturn
Group	Gallic group
Physical characteristics
Mean diameter	6+50%; −30% km
Synodic rotation period	16.33±0.03 h
Albedo	0.06 (assumed)
Spectral type	B–V = 0.61 ± 0.10, V–R = 0.51 ± 0.13
Apparent magnitude	24.1
Absolute magnitude (H)	15.0

Bebhionn (/ˈbeɪvɪn, ˈbɛviɒn/), also known as Saturn XXXVII, is a small, irregular natural satellite 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 9 March 2005.

Bebhionn is about 6 kilometres in diameter and orbits Saturn at an average distance of 16,898 Mm in 820.130 days at an inclination of 41° to the ecliptic (18° to Saturn's equator) and with an eccentricity of 0.333. The rotation period of Bebhionn was measured at 16.33±0.03 hours by the ISS camera of the Cassini spacecraft.^[2]^[5] Bebhionn's light curve reflects an elongated shape with large variations in brightness, making it a leading candidate for a contact binary or binary moon.^[3]

Name

The moon was named in April 2007 after Béibhinn (Béḃinn), an early Irish goddess of birth, who was renowned for her beauty. In Irish, Béibhinn/Béḃinn is pronounced [ˈbʲeːvʲiːn̠ʲ] (southern accents, English approximation /ˈbeɪviːn/ BAY-veen) or [ˈbʲeːvʲɪn̠ʲ] (northern accents, English approximation /ˈbeɪvɪn/ BAY-vin). The spelling "bh" (older "ḃ") indicates that the second consonant is softened to a "v" sound. The extra "o" in the unusual spelling Bebhionn suggests that the final "nn" should be broad [n̪ˠ], but is not itself pronounced. The name is still pronounced as a compound (and thus sometimes spelled Bé Binn etc.), so the unstressed vowel is not reduced to a schwa.