Irregular moons of Saturn -- Skoll For notes, see https://tilmanndenk.de/outersaturnianmoons/skoll/#1 23 Oct 2018 / TD Overview Table Moon name Skoll Saturn range 18e6 km Orbit period 2.4 years Orbit direction retrograde Size ~ 5 km Rotation period 7 16 hh:mm Discovery year 2006 (A) Designations and discovery circumstances (A1) Moon name Skoll (A2) Moon abbrev. (TD) Sko (A3) IAU number Saturn XLVII (A4) Provisional designation S/2006 S 8 (A5) SPICE ID 647 (A6) Also-used label S47 (A7) First observation date 05 Jan 2006 (A7) Announcement date 30 Jun 2006 (A7) IAU circular announcement no. 8727 (A8) Discoverers Sheppard, S. et al. (B) Orbit parameters (B1) Orbit direction retrograde (B2) Group member Norse (B3) Dynamical family -- (B4) Periapsis range 9.47e6 km (B5) Semi-major axis 17.67e6 km (B6) Apoapsis range 25.87e6 km (B7) Semi-major axis 293 R_Saturn (B8) Semi-major axis 0.118 au (B9) Semi-major axis 0.27 R_Hill (B10) Orbit eccentricity 0.46 (B11) Orbit inclination 161.0 ° (B12) Inclination supplemental angle 19.0 ° (B13) Orbital period 878 d (B14) Orbital period 2 4 3.75 y:m:w (B15) Mean orbit velocity 1.47 km/s (C) Physical parameters (C1) Mean size ~ 5 -0.75 +1.25 km (C2) Mean radius ~ 2.3 km (C3) Equatorial circumference ~ 15 km (C4) Minimum equatorial axes ratio 1.142 (C5) Axes radii (a x b x c) ~ unknown (C5) (C6) Mass ~ 3e13 kg (C7) Mean density (?) 0.5 g/cm^3 (C8) Surface escape velocity ~ 3 km/h (C9) Rotation period 7.26 h (?) (C9) Rotation period error 0.09 h (C9) Spin rate 3.31 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 ~ 15.4 mag (C15) Apparent visual magnitude from Earth 24.5 mag (C16) Best apparent magnitude for Cassini 15.5 mag (C17) Spectral slope unknown (C17) B-R color index unknown (C18) Albedo (?) 0.06 (C19) Hill sphere radius ~ 230 km (C20) Hill sphere radius ~ 100 r_Sko