Asteroids with Satellites Database--Johnston's Archive

(225088) Gonggong and Xiangliu

compiled by Wm. Robert Johnston
last updated 22 March 2020

--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, 3:10 resonance

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 66.9901 AU
orbital period P: 548.2971 yr
(= 2399586.8 d)
eccentricity e: 0.506639
perihelion distance q: 33.0503 AU
aphelion distance Q: 100.9299 AU
inclination i: 30.92669°
argument of perihelion ω: 206.925°
ascending node Ω: 336.81679°
mean anomaly M: 104.284°
perihelion passage TP: 1857 Sep 29.3
Epoch: 2016 Jul 31
data arc: 1985-2015 (230 obs.)
Earth MOID: 32.0809 AU
Jupiter Tisserand invariant TJ: 5.385
Neptune Tisserand invariant TN:2.65666802126704 [*D]

orbital data, secondary:
semimajor axis as: 15000 km (separation) [M16a]
separation/primary radius as/rp:20 [*D]
separation/Hill radius as/rH:0.0038 [*E]
orbital period Ps: 6 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 2.5 [MPC]
2.34 ± 0.005 [P16a]
slope parameter G: (0.15) [*A]
effective diameter dE: 1535 ± 75/225 km [P16a]
geometric albedo: 0.089 ± 0.031/0.009 [P16a]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 4000000 km [*E]

other data, primary:
diameter dp: 1535 ± 75/225 km [P16a]
rotation period RPp: 44.81 h [JPL]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 300 km [M16a]
diameter ratio ds/dp: 0.2 [*D]
component mag. difference ΔM: ?
rotation period RPs: ?

-- (225088) Gonggong and Xiangliu --discovery and notes:

Primary discovered 2007 Jul 17 from Palomar Observatory, California, USA by M. E. Schwamb, M. E. Brown, and D. Rabinowitz. Linked to prediscovery observations from 1985 Aug 19. Permanent number assigned 2009 Nov 02. Named Gonggong on 5 Feb 2020 [MPC121135].

Companion discovered 2010 Sep 18 by G. Marton, C. Kiss, and T. Mueller using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2016 Oct 17 [M16a]. Named Xiangliu on 5 Feb 2020 [MPC121135].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2016, 2020 by Wm. Robert Johnston.
Last modified 22 March 2020.
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