Asteroids with Satellites Database--Johnston's Archive

(174567) Varda and IImare

compiled by Wm. Robert Johnston
last updated 31 January 2015

--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: 45.63423503 AU
orbital period P: 308.2793002 yr
(= 112599.0144 d)
eccentricity e: 0.141676948
perihelion distance q: 39.1689159 AU
aphelion distance Q: 52.09955415 AU
inclination i: 21.50449895°
argument of perihelion ω: 184.3104877°
ascending node Ω: 184.0316775°
mean anomaly M: 263.7013967°
perihelion passage TP: 2096 Nov 07
Epoch: 2014 May 23
data arc: 1980-2010 (72 obs.)
Earth MOID: 38.1672 AU
Jupiter Tisserand invariant TJ: 5.569
Neptune Tisserand invariant TN:2.928 [*D]


orbital data, secondary:
semimajor axis as: 4800 ± 20 km [G14a]
separation/primary radius as/rp:13.6 [*D]
separation/Hill radius as/rH:0.0023 [*D]
orbital period Ps: 5.7508 ± 0.0001 d [G14a]
eccentricity es: 0.017 ± 0.003 [G14a]
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 3.4 [MPC]
3.61 ± 0.05 [V14a]
slope parameter G: (0.15) [*A]
effective diameter dE: 792 ± 91/84 km [V14a]
geometric albedo: 0.102 ± 0.024/0.02 [V14a]
color index U-B: ?
color index B-V: 0.9 [P13c]
color index V-R:0.55 ± 0.04 [P13c]
color index B-R:1.45 ± 0.06 [P13c]
color index V-I:1.07 ± 0.05 [P13c]
taxonomic type: IR (G-mode) [P13c]
mass m: 2.65x1020 ± 3.9x1018 kg [V14a]
density ρ: 1.27 ± 0.41/0.44 g/cm3[V14a]
Hill radius rH: 2100000 km [*D]

other data, primary:
diameter dp: 705 ± 81/75 km [V14a]
rotation period RPp: 5.91 h [T14a]
amplitude in mag., rotational ΔM: 0.04 ± 0.01 [T14a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 361 ± 42/38 km [V14a]
diameter ratio ds/dp: 0.513 [G12b]
component mag. difference ΔM: 1.45 [G12b]
rotation period RPs: ?

-- (174567) Varda and IImare --discovery and notes:

Primary discovered 2003 Jun 21 from Kitt Peak Observatory, Arizona, USA by J. A. Larsen. Alternate designation(s): 2003 MW12 . Linked to prediscovery observations from 1980 Mar 19. Permanent number assigned 2008 Jan 22.

Named 2014 Jan 16 for the mythological goddess in J. R. R. Tolkien's fiction [MPC86715].

Companion discovered 2009 Apr 26 by K. S. Noll et al. using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2011. Permanent designation I IImare, assigned 2014 Jan 16; named for the character in J. R. R. Tolkien's fiction [MPC86715].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2011-2014, 2015 by Wm. Robert Johnston.
Last modified 31 January 2015.
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