Irregular moons of Saturn -- Bebhionn For notes, see https://tilmanndenk.de/outersaturnianmoons/bebhionn/#1 23 Oct 2018 / TD Overview Table Moon name Bebhionn Saturn range 17e6 km Orbit period 2.3 years Orbit direction prograde Size ~ 6 km Rotation period 16 20 hh:mm Discovery year 2004 (A) Designations and discovery circumstances (A1) Moon name Bebhionn (A2) Moon abbrev. (TD) Beb (A3) IAU number Saturn XXXVII (A4) Provisional designation S/2004 S 11 (A5) SPICE ID 637 (A6) Also-used label S37 (A7) First observation date 12 Dec 2004 (A7) Announcement date 04 May 2005 (A7) IAU circular announcement no. 8523 (A8) Discoverers Jewitt, et al. (B) Orbit parameters (B1) Orbit direction prograde (B2) Group member Gallic (B3) Dynamical family Gallic (B4) Periapsis range 9.11e6 km (B5) Semi-major axis 17.12e6 km (B6) Apoapsis range 25.13e6 km (B7) Semi-major axis 284 R_Saturn (B8) Semi-major axis 0.114 au (B9) Semi-major axis 0.26 R_Hill (B10) Orbit eccentricity 0.47 (B11) Orbit inclination 35.1 ° (B12) Inclination supplemental angle 35.1 ° (B13) Orbital period 835 d (B14) Orbital period 2 3 2 y:m:w (B15) Mean orbit velocity 1.49 km/s (C) Physical parameters (C1) Mean size ~ 6 -1 +1.5 km (C2) Mean radius ~ 2.8 km (C3) Equatorial circumference ~ 15 km (C4) Minimum equatorial axes ratio 1.41 (C5) Axes radii (a x b x c) ~ unknown (C5) (C6) Mass ~ 5e13 kg (C7) Mean density (?) 0.5 g/cm^3 (C8) Surface escape velocity ~ 4 km/h (C9) Rotation period 16.33 h (C9) Rotation period error 0.03 h (C9) Spin rate 1.47 d^(-1) (C10) Spin direction unknown (C11) Seasons unknown (C12) Pole direction (ecliptic longitude λ) unknown (C12) Pole direction (ecliptic latitude β) unknown (C13) Pole direction (geocentric RA) unknown (C13) Pole direction (geocentric Dec) unknown (C14) Absolute visual magnitude ~ 15.0 mag (C15) Apparent visual magnitude from Earth 24.1 mag (C16) Best apparent magnitude for Cassini 14.6 mag (C17) Spectral slope (C17) B-R color index ~ 1.12 (C18) Albedo (?) 0.06 (C19) Hill sphere radius ~ 270 km (C20) Hill sphere radius ~ 95 r_Beb