Asteroids with Satellites Database--Johnston's Archive

(120347) Salacia and Actaea

compiled by Wm. Robert Johnston
last updated 10 May 2014
under construction--testing upgrades!

--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: ?
color index B-R:1.03 [?]
taxonomic type: ?
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 ± 45/45 km [F13a]
color index V-I:0.87± 0.01 [B08d]
rotation period RPp: ?
amplitude in mag., rotational ΔM: 0.03 ± 0.01 [*T09a]
pole direction : ? ; ?


other data, secondary:
diameter ds: 286 ± 24/24 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 HST observations from Hubble Space Telescope. Announced 2006 Sep 19 [I8751]. 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 10 May 2014.
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