Bebhionn (moon)

Bebhionn
	Bebhionn imaged by the Cassini spacecraft in May 2017
Discovery
Discovery date	2004
Designations
Designation	Saturn XXXVII
Pronunciation	/ˈbeɪvɪn/, as in the Irish, or /ˈbɛvi.ɒn/ as a spelling pronunciation
Named after	Béibhinn
Alternative names	S/2004 S 11
Orbital characteristics [1]
Semi-major axis	17119000 km
Eccentricity	0.469
Orbital period	−834.8 days
Inclination	35.01°
Satellite of	Saturn
Group	Gallic group
Physical characteristics
Mean diameter	6+50%; −30% km[2]
Rotation period	16.33±0.03 h[2]
Apparent magnitude	24.1

Bebhionn (pronounced /ˈbeɪvɪn/ or /ˈbɛvi.ɒn/), 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][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 [ˈbʲeːvʲiːn̪ʲ] (southern accents, English approximation /ˈbeɪviːn/) or [ˈbʲeːvʲɪn̪ʲ] (northern accents, English approximation /ˈbeɪvɪn/). 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.

References

S.S. Sheppard (2019), Moons of Saturn, Carnegie Science, on line
Denk, T.; Mottola, S. (2019). Cassini Observations of Saturn's Irregular Moons (PDF). 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute.
T. Denk, S. Mottola, et al. (2011): Rotation Periods of Irregular Satellites of Saturn. EPSC/DPS conference 2011, Nantes (France), abstract 1452.

Institute for Astronomy Saturn Satellite Data
Jewitt's New Satellites of Saturn page May 3, 2005 (includes discovery images)
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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[1] S.S. Sheppard (2019), Moons of Saturn, Carnegie Science, on line

[LPSC2654-2] Denk, T.; Mottola, S. (2019). Cassini Observations of Saturn's Irregular Moons (PDF). 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute.

[DenkMottola2011-3] T. Denk, S. Mottola, et al. (2011): Rotation Periods of Irregular Satellites of Saturn. EPSC/DPS conference 2011, Nantes (France), abstract 1452.

Moons of Saturn
Listed in approximately increasing distance from Saturn as of epoch JD 2459200.5.
Ring shepherds	S/2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus Pandora
Co-orbitals	Epimetheus Janus
G Ring	Aegaeon
Alkyonides	Methone Anthe Pallene
Inner large (with trojans)	Mimas Enceladus Tethys Telesto Calypso Dione Helene Polydeuces
Outer large	Rhea Titan Hyperion Iapetus
Inuit group (7)	Kiviuq Ijiraq Paaliaq S/2004 S 29 S/2004 S 31 Tarqeq Siarnaq
Norse group (46)	Phoebe Skathi S/2004 S 37 S/2007 S 2 Skoll Hyrrokkin Greip Mundilfari S/2004 S 13 (?) S/2006 S 1 S/2007 S 3 (?) Suttungr S/2004 S 20 Jarnsaxa Narvi Bergelmir Hati S/2004 S 17 (?) S/2004 S 12 (?) S/2004 S 27 Farbauti Thrymr Bestla S/2004 S 7 (?) Aegir S/2004 S 30 S/2004 S 22 S/2004 S 25 S/2004 S 32 S/2004 S 23 S/2006 S 3 S/2004 S 35 Kari S/2004 S 28 Loge S/2004 S 38 Fenrir Ymir Surtur S/2004 S 33 S/2004 S 21 S/2004 S 39 S/2004 S 36 Fornjot S/2004 S 34 S/2004 S 26
Gallic group (4)	Albiorix Bebhionn Erriapus Tarvos
Prograde outer satellites	S/2004 S 24
Rings of Saturn Cassini–Huygens Themis Chiron S/2004 S 6 S/2004 S 4 S/2004 S 3 In fiction

Saturn
Outline of Saturn
Geography	Dragon Storm Great White Spot Hexagon Magnetosphere Rings
Moons	S/2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus S/2004 S 6 S/2004 S 4 S/2004 S 3 Pandora Epimetheus Janus Aegaeon Mimas Methone Anthe Pallene Enceladus Tethys Telesto Calypso Dione Helene Polydeuces Rhea Titan Hyperion Iapetus Kiviuq Ijiraq Phoebe Paaliaq Skathi S/2004 S 37 Albiorix S/2007 S 2 S/2004 S 29 Bebhionn Erriapus Skoll S/2004 S 31 Siarnaq Tarqeq S/2004 S 13 Greip Hyrrokkin Jarnsaxa Tarvos Mundilfari S/2006 S 1 S/2004 S 17 Bergelmir Narvi S/2004 S 20 Suttungr Hati S/2004 S 12 S/2004 S 27 Farbauti Thrymr S/2004 S 30 Aegir S/2007 S 3 Bestla S/2004 S 7 S/2004 S 22 S/2004 S 23 S/2004 S 25 S/2004 S 32 S/2006 S 3 S/2004 S 38 Fenrir S/2004 S 28 Surtur Kari S/2004 S 35 Ymir S/2004 S 21 S/2004 S 24 Loge S/2004 S 36 S/2004 S 39 S/2004 S 33 S/2004 S 34 Fornjot S/2004 S 26
Astronomy	Delta Octantis Saturn-crossing minor planets
Exploration	Cassini–Huygens (Huygens) timeline retirement Pioneer 11 Voyager program Voyager 1 Voyager 2
Related	Fiction Moons The Day the Earth Smiled In Saturn's Rings (2018 documentary)