Irregular moons of Saturn -- Erriapus

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

22 Oct 2018 / TD


	Overview Table
Moon name	Erriapus
Saturn range	18e6	km
Orbit period	2.4	years
Orbit direction	prograde
Size ~	29	km
Rotation period	28	09	hh:mm
Discovery year	2000

(A)	Designations and discovery circumstances
(A1)	Moon name	Erriapus
(A2)	Moon abbrev. (TD)	Err
(A3)	IAU number	Saturn XXVIII
(A4)	Provisional designation	S/2000 S 10
(A5)	SPICE ID	628
(A6)	Also-used label	S28
(A7)	First observation date	23 Sep 2000
(A7)	Announcement date	07 Dec 2000
(A7)	IAU circular announcement no.	7539
(A8)	Discoverers	Kavelaars, Gladman, et al.

(B)	Orbit parameters
(B1)	Orbit direction	prograde
(B2)	Group member	Gallic
(B3)	Dynamical family	Gallic
(B4)	Periapsis range	9.29e6	km
(B5)	Semi-major axis	17.60e6	km
(B6)	Apoapsis range	25.91e6	km
(B7)	Semi-major axis	292	R_Saturn
(B8)	Semi-major axis	0.118	au
(B9)	Semi-major axis	0.27	R_Hill
(B10)	Orbit eccentricity	0.47	
(B11)	Orbit inclination	34.5	°
(B12)	Inclination supplemental angle	34.5	°
(B13)	Orbital period	871	d
(B14)	Orbital period	2	4	2.75	y:m:w
(B15)	Mean orbit velocity	1.47	km/s

(C)	Physical parameters
(C1)	Mean size ~	10	-2	+3	km
(C2)	Mean radius ~	5.1	km
(C3)	Equatorial circumference ~	32	km
(C4)	Minimum equatorial axes ratio	1.51
(C5)	Axes radii (a x b x c) ~	unknown
(C5)	
(C6)	Mass ~	3e14	kg
(C7)	Mean density (?)	0.5	g/cm^3
(C8)	Surface escape velocity ~	7	km/h
(C9)	Rotation period	28.15	h
(C9)	Rotation period error	0.25	h
(C9)	Spin rate	0.85	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 ~	13.7	mag
(C15)	Apparent visual magnitude from Earth	23.0	mag
(C16)	Best apparent magnitude for Cassini	13.6	mag
(C17)	Spectral slope ~	+5.1	%/100nm
(C17)	B-R color index ~	1.11	1.19	
(C18)	Albedo (?)	0.06	
(C19)	Hill sphere radius ~	500	km
(C20)	Hill sphere radius ~	95	r_Err