Asteroids with Satellites Database--Johnston's Archive

2003 YU179

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: 47.111 AU
orbital period P: 323.361 yr
(= 118107.7 d)
eccentricity e: 0.16533
perihelion distance q: 39.3217 AU
aphelion distance Q: 54.900 AU
inclination i: 4.84709°
argument of perihelion ω: 327.28°
ascending node Ω: 126.4588°
mean anomaly M: 24.145°
perihelion passage TP: 1992 Sep 13
Epoch: 2014 May 23
data arc: 2003-2013 (23 obs.)
Earth MOID: 38.339 AU
Jupiter Tisserand invariant TJ: 6.024
Neptune Tisserand invariant TN:3.10 [*D]


orbital data, secondary:
semimajor axis as: 2000 ± 200 km (separation) [G12b]
separation/primary radius as/rp:27 [*E]
separation/Hill radius as/rH:0.0050 [*E]
orbital period Ps: 18 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 6.8 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 167 km [*E]
geometric albedo: (0.09 ) [*A]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1 g/cm3) [*A]
Hill radius rH: 400000 km [*E]

other data, primary:
diameter dp: 146 km [*E]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 80 km [*E]
diameter ratio ds/dp: 0.55 [N09c]
component mag. difference ΔM: 1.3 [N09c]
rotation period RPs: ?

-- 2003 YU179 --discovery and notes:

Primary discovered 2003 Dec 24 from Mauna Kea Observatory, Hawaii, USA by ?.

Companion discovered 2008 Sep 27 by K. S. Noll, W. M. Grundy, S. D. Benecchi, and H. A. Levison using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2009 Sep 27 [N09c].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2009, 2014 by Wm. Robert Johnston.
Last modified 20 September 2014.
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