Irregular moons of Saturn -- Phoebe

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

31 Jul 2019 / TD


	Overview Table
Moon name	Phoebe
Saturn range	13e6	km
Orbit period	1.5	years
Orbit direction	retrograde
Size ~	213	km
Rotation period	9	16	hh:mm
Discovery year	1899

(A)	Designations and discovery circumstances
(A1)	Moon name	Phoebe
(A2)	Moon abbrev. (TD)	Pho
(A3)	IAU number	Saturn IX
(A4)	Provisional designation	--
(A5)	SPICE ID	609
(A6)	Also-used label	S09
(A7)	First observation date	16 Aug 1898
(A7)	Announcement date	17 Mar 1899
(A7)	Harvard Obs. Bull. announcement no.	49
(A8)	Discoverers	Pickering, W.H., Stewart, D.

(B)	Orbit parameters
(B1)	Orbit direction	retrograde
(B2)	Group member	Norse
(B3)	Dynamical family	?
(B4)	Periapsis range	10.83e6	km
(B5)	Semi-major axis	12.948e6	km
(B6)	Apoapsis range	15.06e6	km
(B7)	Semi-major axis	215	R_Saturn
(B8)	Semi-major axis	0.087	au
(B9)	Semi-major axis	0.20	R_Hill
(B10)	Orbit eccentricity	0.163	
(B11)	Orbit inclination	175.24	°
(B12)	Inclination supplemental angle	4.76	°
(B13)	Orbital period	548	d
(B14)	Orbital period	1	6	0	y:m:w
(B15)	Mean orbit velocity	1.71	km/s

(C)	Physical parameters
(C1)	Mean size ~	213	-1	+1	km
(C2)	Mean radius ~	106.4	km
(C3)	Equatorial circumference ~	685	km
(C4)	Minimum equatorial axes ratio	1.01
(C5)	Axes radii (a x b x c) ~	109	108	102	km
(C5)	
(C6)	Mass ~	8.29e18	kg
(C7)	Mean density (?)	1.64	g/cm^3
(C8)	Surface escape velocity ~	320	km/h
(C9)	Rotation period (sidereal)	9.273651	h
(C9)	Rotation period error	0.000006	h
(C9)	Spin rate	2.588	d^(-1)
(C10)	Spin direction	prograde
(C11)	Seasons	none
(C12)	Pole direction (ecliptic longitude λ)	61.2	±0.3	°
(C12)	Pole direction (ecliptic latitude β)	64.46	±0.1	°
(C13)	Pole direction (geocentric RA)	356.6	±0.3	°
(C13)	Pole direction (geocentric Dec)	+78.0	±0.1	°
(C14)	Absolute visual magnitude ~	6.6	mag
(C15)	Apparent visual magnitude from Earth	16	mag
(C16)	Best apparent magnitude for Cassini	5.1	mag
(C17)	Spectral slope ~	-2.5	%/100nm
(C17)	B-R color index ~	0.98	0.91	
(C18)	Albedo (?)	0.06	
(C19)	Hill sphere radius ~	18000	km
(C20)	Hill sphere radius ~	170	r_Pho