Asteroids with Satellites Database--Johnston's Archive

(612687) 2003 UN284

compiled by Wm. Robert Johnston
last updated 10 April 2022

--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: 42.79318508 AU
orbital period P: 279.9433274 yr
(= 102249.3004 d)
eccentricity e: 0.006737713
perihelion distance q: 42.50485688 AU
aphelion distance Q: 43.08151329 AU
inclination i: 3.071819987°
argument of perihelion ω: 27.39667061°
ascending node Ω: 36.03442653°
mean anomaly M: 4.36711406°
perihelion passage TP: 2010 Dec 29
Epoch: 2014 May 23
data arc: 2003-2008 (31 obs.)
Earth MOID: 41.5173 AU
Jupiter Tisserand invariant TJ: 5.849
Neptune Tisserand invariant TN:3.085 [*D]


orbital data, secondary:
semimajor axis as: 54000 ± 2000 km [G14a]
separation/primary radius as/rp:870 [*D]
separation/Hill radius as/rH:0.14 [*D]
orbital period Ps: 3180 ± 90 d [G14a]
eccentricity es: 0.38 ± 0.02 [G14a]
inclination is:32.6° ± 0.7° [G14a]
ascending node Ωs:50° ± 1° [G14a]
argument of pericenter ωs:270° ± 4° [G14a]
mean anomaly M:202° ± 3° [G14a]
Epoch:2003 Nov 20.3
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 7.5 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 149 km [*D]
geometric albedo: 0.09 ± 0.03/0.01 [P11a]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: 1.3x1018 ± 1x1017 kg [G14a]
density ρ: (1 g/cm3) [*A]
Hill radius rH: 380000 km [*D]

other data, primary:
diameter dp: 124 ± 6/10 km [P11a]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 83 ± 5/7 km [*D]
diameter ratio ds/dp: 0.667 ± 0.018 [P11a]
component mag. difference ΔM: 0.88 ± 0.06 [P11a]
rotation period RPs: ?

-- (612687) 2003 UN284 --discovery and notes:

Primary discovered 2003 Oct 24 from Kitt Peak Observatory, Arizona, USA by M. W. Buie. Permanent number assigned 28 Mar 2022.

Companion discovered 2003 Oct 24 by R. L. Millis, K. B. Clancy, Deep Ecliptic Survey team using imaging observations from Mayall Telescope, Kitt Peak, Arizona, USA. Announced 2003 Dec 05 [M03k].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2003-2015, 2022 by Wm. Robert Johnston.
Last modified 10 April 2022.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.