Irregular moons of Saturn -- Suttungr For notes, see https://tilmanndenk.de/outersaturnianmoons/suttungr/#1 22 Oct 2018 / TD Overview Table Moon name Suttungr Saturn range 19e6 km Orbit period 2.8 years Orbit direction retrograde Size ~ 7 km Rotation period 7 40 hh:mm Discovery year 2000 (A) Designations and discovery circumstances (A1) Moon name Suttungr (A2) Moon abbrev. (TD) Sut (A3) IAU number Saturn XXIII (A4) Provisional designation S/2000 S 12 (A5) SPICE ID 623 (A6) Also-used label S23 (A7) First observation date 23 Sep 2000 (A7) Announcement date 23 Dec 2000 (A7) IAU circular announcement no. 7548 (A8) Discoverers Gladman, Kavelaars, et al. (B) Orbit parameters (B1) Orbit direction retrograde (B2) Group member Norse (B3) Dynamical family Suttungr (B4) Periapsis range 17.25e6 km (B5) Semi-major axis 19.47e6 km (B6) Apoapsis range 21.69e6 km (B7) Semi-major axis 323 R_Saturn (B8) Semi-major axis 0.130 au (B9) Semi-major axis 0.30 R_Hill (B10) Orbit eccentricity 0.11 (B11) Orbit inclination 175.8 ° (B12) Inclination supplemental angle 4.2 ° (B13) Orbital period 1017 d (B14) Orbital period 2 9 1.75 y:m:w (B15) Mean orbit velocity 1.40 km/s (C) Physical parameters (C1) Mean size ~ 7 -1.2 +2 km (C2) Mean radius ~ 3.5 km (C3) Equatorial circumference ~ 22 km (C4) Minimum equatorial axes ratio 1.18 (C5) Axes radii (a x b x c) ~ unknown (C5) (C6) Mass ~ 9e13 kg (C7) Mean density (?) 0.5 g/cm^3 (C8) Surface escape velocity ~ 5 km/h (C9) Rotation period 7.67 h (C9) Rotation period error 0.02 h (C9) Spin rate 3.13 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 ~ 14.5 mag (C15) Apparent visual magnitude from Earth 23.9 mag (C16) Best apparent magnitude for Cassini 15.4 mag (C17) Spectral slope ~ -3.2 %/100nm (C17) B-R color index ~ 1.12 (C18) Albedo (?) 0.06 (C19) Hill sphere radius ~ 640 km (C20) Hill sphere radius ~ 180 r_Sut