Asteroids with Satellites Database--Johnston's Archive

(229762) G!kunll'homdima and G!o'e!Hu

compiled by Wm. Robert Johnston
last updated 7 April 2019

--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: 72.7225 AU
orbital period P: 620.159 yr
(= 2468536.71 d)
eccentricity e: 0.484309
perihelion distance q: 37.50233 AU
aphelion distance Q: 107.9426 AU
inclination i: 23.377938°
argument of perihelion ω: 346.8759°
ascending node Ω: 131.09416°
mean anomaly M: 344.2086°
perihelion passage TP: 2046 Jul 10.21
Epoch: 2019 Apr 27
data arc: 1982-2013 (178 obs.)
Earth MOID: 36.5228 AU
Jupiter Tisserand invariant TJ: 6.076
Neptune Tisserand invariant TN:2.911293644324 [*D]


orbital data, secondary:
semimajor axis as: 6035 ± 48 km [G19a]
separation/primary radius as/rp:19.7 [*D]
separation/Hill radius as/rH:0.0039 [*D]
orbital period Ps: 11.31473 ± 0.00016 d [G19a]
eccentricity es: 0.0236 ± 0.0066 [G19a]
inclination is:43.75° ± 0.38° [G19a]
ascending node Ωs:110.6° ± 1.5° [G19a]
argument of pericenter ωs:91° ± 18° [G19a]
mean anomaly M:344° ± 1.4° [G19a]
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 3.3 [MPC]
3.68 ± 0.03 [G12b]
slope parameter G: (0.15) [*A]
effective diameter dE: 629 km [*D]
geometric albedo: 0.15 ± 0.016 [S17a]
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: 1.36x1020 ± 3.3x1018 kg [G19a]
density ρ: 1.04 ± 0.17 g/cm3[G19a]
Hill radius rH: 1600000 km [*E]

other data, primary:
diameter dp: 614 ± 15 km [S17a]
color index V-I:1.03 ± 0.03 [G19a]
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: 138 km [*D]
diameter ratio ds/dp: 0.225 ± 0.004 [*D]
component mag. difference ΔM: 3.242 ± 0.039 [G19a]
color index V-I:1.8± 0.08 [G19a]
rotation period RPs: ?

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

Primary discovered 2007 Oct 19 from Palomar Observatory, California, USA by M. E. Schwamb, M. E. Brown, and D. Rabinowitz. Linked to prediscovery observations from 1982 Aug 16. Alternate designation: 2007 UK126. Permanent number assigned 2009 Dec 31. Named 7 April 2019 for the Jul'hoan mythological character.

Companion discovered 2008 Nov 13 using observations from Hubble Space Telescope. Announced 2011. Named 7 April 2019 for the Jul'hoan mythological horn.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2011-2014, 2019 by Wm. Robert Johnston.
Last modified 7 April 2019.
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