Irregular moons of Saturn -- Thrymr

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

22 Oct 2018 / TD


	Overview Table
Moon name	Thrymr
Saturn range	20e6	km
Orbit period	3.0	years
Orbit direction	retrograde
Size ~	8	km
Rotation period	38	47	hh:mm
Discovery year	2000

(A)	Designations and discovery circumstances
(A1)	Moon name	Thrymr
(A2)	Moon abbrev. (TD)	Thr
(A3)	IAU number	Saturn XXX
(A4)	Provisional designation	S/2000 S 7
(A5)	SPICE ID	630
(A6)	Also-used label	S30
(A7)	First observation date	23 Sep 2000
(A7)	Announcement date	07 Dec 2000
(A7)	IAU circular announcement no.	7538
(A8)	Discoverers	Gladman, Kavelaars, et al.

(B)	Orbit parameters
(B1)	Orbit direction	retrograde
(B2)	Group member	Norse
(B3)	Dynamical family	Suttungr? 2004_S7?
(B4)	Periapsis range	10.90e6	km
(B5)	Semi-major axis	20.42e6	km
(B6)	Apoapsis range	29.94e6	km
(B7)	Semi-major axis	338	R_Saturn
(B8)	Semi-major axis	0.136	au
(B9)	Semi-major axis	0.31	R_Hill
(B10)	Orbit eccentricity	0.47	
(B11)	Orbit inclination	177.7	°
(B12)	Inclination supplemental angle	2.3	°
(B13)	Orbital period	1094	d
(B14)	Orbital period	2	11	4	y:m:w
(B15)	Mean orbit velocity	1.36	km/s

(C)	Physical parameters
(C1)	Mean size ~	8	-1.3	+2.2	km
(C2)	Mean radius ~	3.8	km
(C3)	Equatorial circumference ~	25	km
(C4)	Minimum equatorial axes ratio	1.21
(C5)	Axes radii (a x b x c) ~	unknown
(C5)	
(C6)	Mass ~	1e14	kg
(C7)	Mean density (?)	0.5	g/cm^3
(C8)	Surface escape velocity ~	5	km/h
(C9)	Rotation period	38.79	h	(?)
(C9)	Rotation period error	0.25	h
(C9)	Spin rate	0.62	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 ~	14.3	mag
(C15)	Apparent visual magnitude from Earth	23.9	mag
(C16)	Best apparent magnitude for Cassini	14.9	mag
(C17)	Spectral slope ~	-3.0	%/100nm
(C17)	B-R color index ~	1.00	
(C18)	Albedo (?)	0.06	
(C19)	Hill sphere radius ~	440	km
(C20)	Hill sphere radius ~	115	r_Thr