Irregular moons of Saturn -- Surtur

For notes, see https://tilmanndenk.de/outersaturnianmoons/surtur/#1

22 Oct 2018 / TD


	Overview Table
Moon name	Surtur
Saturn range	23e6	km
Orbit period	3.5	years
Orbit direction	retrograde
Size ~	4	km
Rotation period	unknown
Discovery year	2006

(A)	Designations and discovery circumstances
(A1)	Moon name	Surtur
(A2)	Moon abbrev. (TD)	Sur
(A3)	IAU number	Saturn XLVIII
(A4)	Provisional designation	S/2006 S 7
(A5)	SPICE ID	648
(A6)	Also-used label	S48
(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	Ymir
(B4)	Periapsis range	12.71e6	km
(B5)	Semi-major axis	22.94e6	km
(B6)	Apoapsis range	33.17e6	km
(B7)	Semi-major axis	380	R_Saturn
(B8)	Semi-major axis	0.153	au
(B9)	Semi-major axis	0.35	R_Hill
(B10)	Orbit eccentricity	0.45	
(B11)	Orbit inclination	169.7	°
(B12)	Inclination supplemental angle	10.3	°
(B13)	Orbital period	1296	d
(B14)	Orbital period	3	6	2.5	y:m:w
(B15)	Mean orbit velocity	1.29	km/s

(C)	Physical parameters
(C1)	Mean size ~	4	-0.75	+1	km
(C2)	Mean radius ~	1.9	km
(C3)	Equatorial circumference ~	12	km
(C4)	Minimum equatorial axes ratio	unknown
(C5)	Axes radii (a x b x c) ~	unknown
(C5)	
(C6)	Mass ~	1.5e13	kg
(C7)	Mean density (?)	0.5	g/cm^3
(C8)	Surface escape velocity ~	3	km/h
(C9)	Rotation period	unknown
(C9)	Rotation period error	-
(C9)	Spin rate	unknown
(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
(C13)	Pole direction (geocentric Dec)	unknown
(C14)	Absolute visual magnitude ~	15.8	mag
(C15)	Apparent visual magnitude from Earth	24.8	mag
(C16)	Best apparent magnitude for Cassini	16.0	mag
(C17)	Spectral slope	unknown
(C17)	B-R color index	unknown
(C18)	Albedo (?)	0.06	
(C19)	Hill sphere radius ~	260	km
(C20)	Hill sphere radius ~	135	r_Sur