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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