Irregular moons of Saturn -- Albiorix For notes, see https://tilmanndenk.de/outersaturnianmoons/albiorix/#1 22 Oct 2018 / TD Overview Table Moon name Albiorix Saturn range 16e6 km Orbit period 2.1 years Orbit direction prograde Size ~ 29 km Rotation period 13 20 hh:mm Discovery year 2000 (A) Designations and discovery circumstances (A1) Moon name Albiorix (A2) Moon abbrev. (TD) Alb (A3) IAU number Saturn XXVI (A4) Provisional designation S/2000 S 11 (A5) SPICE ID 626 (A6) Also-used label S26 (A7) First observation date 09 Nov 2000 (A7) Announcement date 19 Dec 2000 (A7) IAU circular announcement no. 7545 (A8) Discoverers Holman M. et al. (B) Orbit parameters (B1) Orbit direction prograde (B2) Group member Gallic (B3) Dynamical family Gallic (B4) Periapsis range 8.52e6 km (B5) Semi-major axis 16.39e6 km (B6) Apoapsis range 24.26e6 km (B7) Semi-major axis 272 R_Saturn (B8) Semi-major axis 0.110 au (B9) Semi-major axis 0.25 R_Hill (B10) Orbit eccentricity 0.48 (B11) Orbit inclination 34.1 ° (B12) Inclination supplemental angle 34.1 ° (B13) Orbital period 784 d (B14) Orbital period 2 1 3.25 y:m:w (B15) Mean orbit velocity 1.52 km/s (C) Physical parameters (C1) Mean size ~ 29 -5.5 +5.5 km (C2) Mean radius ~ 14.3 km (C3) Equatorial circumference ~ 90 km (C4) Minimum equatorial axes ratio 1.34 (C5) Axes radii (a x b x c) ~ unknown (C5) (C6) Mass ~ 7e15 kg (C7) Mean density (?) 0.5 g/cm^3 (C8) Surface escape velocity ~ 20 km/h (C9) Rotation period 13.33 h (C9) Rotation period error 0.03 h (C9) Spin rate 1.80 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 ~ 11.1 mag (C15) Apparent visual magnitude from Earth 20.5 mag (C16) Best apparent magnitude for Cassini 9.5 mag (C17) Spectral slope ~ +12.5 %/100nm (C17) B-R color index ~ 1.35 1.29 (C18) Albedo (?) 0.06 (C19) Hill sphere radius ~ 1500 km (C20) Hill sphere radius ~ 90 r_Alb