Asteroids with Satellites Database--Johnston's Archive

(229762) 2007 UK126

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, scattered disk


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 74.158 AU
orbital period P: 638.627 yr
(= 233258.7 d)
eccentricity e: 0.49374
perihelion distance q: 37.5437 AU
aphelion distance Q: 110.773 AU
inclination i: 23.340295°
argument of perihelion ω: 346.144°
ascending node Ω: 131.28692°
mean anomaly M: 342.106°
perihelion passage TP: 2046 Feb 18
Epoch: 2014 May 23
data arc: 1982-2013 (73 obs.)
Earth MOID: 36.5641 AU
Jupiter Tisserand invariant TJ: 6.099
Neptune Tisserand invariant TN:2.91 [*D]


orbital data, secondary:
semimajor axis as: 3600 ± 1300 km (separation) [G12b]
separation/primary radius as/rp:12 [*E]
separation/Hill radius as/rH:0.0036 [*E]
orbital period Ps: 5.9 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 3.4 [MPC]
3.68 ± 0.03 [G12b]
slope parameter G: (0.15) [*A]
effective diameter dE: 599 ± 77/77 km [S12a]
geometric albedo: 0.167 ± 0.058/0.038 [S12a]
color index U-B: ?
color index B-V: ?
color index V-R:0.62 ± 0.05 [P10a]
color index V-I:1.09 ± 0.05 [P10a]
color index R-J:0.91 ± 0.08 [P10a]
color index V-J:1.53 ± 0.08 [P10a]
color index J-H:0.36 ± 0.11 [P10a]
color index V-H:1.89 ± 0.08 [P10a]
taxonomic type: ?
mass m: ?
density ρ: >0.32 g/cm3[T14a]
Hill radius rH: 1000000 km [*E]

other data, primary:
diameter dp: 590 ± 76 km [*D]
rotation period RPp: 11.05 h [T14a]
amplitude in mag., rotational ΔM: 0.03 ± 0.01 [T14a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 103 km [*D]
diameter ratio ds/dp: 0.175 [G12b]
component mag. difference ΔM: 3.79 [G12b]
rotation period RPs: ?

-- (229762) 2007 UK126 --discovery and notes:

Primary discovered 2007 Oct 19 from Palomar Observatory, California, USA by ?. Linked to prediscovery observations from 1982 Aug 16. Permanent number assigned 2009 Dec 31.

Companion discovered 2008 Nov 13 using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2011.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2011, 2014 by Wm. Robert Johnston.
Last modified 20 September 2014.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.