Asteroids with Satellites Database--Johnston's Archive

(120347) Salacia and Actaea

compiled by Wm. Robert Johnston
last updated 20 September 2014

--Orbital and physical data--

(See this page for definitions of quantities; source codes in brackets, see this link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)

dynamical type, primary: TNO, Cubewano


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 41.9621 AU
orbital period P: 271.828 yr
(= 99285.1 d)
eccentricity e: 0.106288
perihelion distance q: 37.5020 AU
aphelion distance Q: 46.4221 AU
inclination i: 23.944010°
argument of perihelion ω: 308.461°
ascending node Ω: 280.22934°
mean anomaly M: 119.201°
perihelion passage TP: 1924 May 20
Epoch: 2014 May 23
data arc: 1982-2010 (100 obs.)
Earth MOID: 36.5442 AU
Jupiter Tisserand invariant TJ: 5.285
Neptune Tisserand invariant TN:2.86 [*D]


orbital data, secondary:
semimajor axis as: 5619 ± 87 km [S12c]
separation/primary radius as/rp:13 [*D]
separation/Hill radius as/rH:0.0024 [*D]
orbital period Ps: 5.49380 ± 0.00016 d [S12c]
eccentricity es: 0.0084 ± 0.0076 [S12c]
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 4.2 [MPC]
4.25 ± 0.05 [F13a]
slope parameter G: (0.15) [*A]
effective diameter dE: 901 ± 45/45 km [F13a]
geometric albedo: 0.044 ± 0.004/0.004 [F13a]
color index U-B: ?
color index B-V: 0.61 [P13c]
color index V-R:0.42 ± 0.04 [P13c]
color index B-R:1.03 ± 0.06 [P13c]
color index V-I:0.91 ± 0.07 [P13c]
taxonomic type: BR (G-mode) [P13c]
mass m: 4.38x1020 ± 1.6x1019 kg [S12c]
density ρ: 1.29 ± 0.29/0.23 g/cm3[F13a]
Hill radius rH: 2300000 km [*D]

other data, primary:
diameter dp: 854 ± 45 km [F13a]
color index V-I:0.87 ± 0.01 [B08d]
rotation period RPp: 6.5 h [T14a]
amplitude in mag., rotational ΔM: 0.06 ± 0.02 [T14a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 286 ± 24 km [F13a]
diameter ratio ds/dp: 0.344 [G11a]
component mag. difference ΔM: 2.37 ± 0.06 [S12c]
color index V-I:0.89± 0.04 [B08d]
rotation period RPs: ?

-- (120347) Salacia and Actaea --discovery and notes:

Primary discovered 2004 Sep 22 from Palomar Observatory, California, USA by H. G. Roe, M. E. Brown, and K. M. Barkume. Alternate designation(s): 2004 SB60 . Linked to prediscovery observations from 1982 Jul 25. Permanent number assigned 2005 Nov 16.

Named 2011 Feb 18 for the mythological Roman goddess of calm ocean [MPC73984].

Companion discovered 2006 Jul 21 by K. S. Noll, H. F. Levison, D. C. Stephens, and W. M. Grundy using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2006 Sep 19 [N06f]. Provisional designation S/2006 (120347) 1. Permanent designation I Actaea, assigned 2011 Feb 18; named for the Roman mythological Nereid [MPC73984].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2006-2012, 2014 by Wm. Robert Johnston.
Last modified 20 September 2014.
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