Asteroids with Satellites Database--Johnston's Archive
2011 JY31
compiled by Wm. Robert Johnston
last updated
23 January 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: |
44.293 AU
| |
orbital period P: |
294.79 yr
(= 107670 d)
| |
eccentricity e: |
0.06351
| |
perihelion distance q: |
41.48 AU
| |
aphelion distance Q: |
47.106 AU
| |
inclination i: |
2.6034°
| |
argument of perihelion ω: |
106.47°
| |
ascending node Ω: |
231.42°
| |
mean anomaly M: |
317.86°
| |
perihelion passage TP: |
2056 Jul 25
| |
Epoch: |
2022 Jan 21
| |
data arc: |
2011-2016
(59 obs.)
| |
Earth MOID: |
40.4726 AU
| |
Jupiter Tisserand invariant TJ: |
5.935
|
| Neptune Tisserand invariant TN: | 3.099 [*D] |
orbital data, secondary:
|
semimajor axis as: |
198.6
± 2.9 km
[W22b]
| |
separation/primary radius as/rp: | 6.5 [*D] | |
separation/Hill radius as/rH: | 0.0010 [*D] | |
orbital period Ps: |
1.94
± 0.002
d [W22b]
| |
eccentricity es: |
0
[W22b]
| |
inclination is: | 61.5° ± 1.3° [W22b] | |
ascending node Ωs: | 78.8° ± 1.9° [W22b] | |
mean anomaly M: | 45.9° ± 2.06° [W22b] | |
Epoch: | 2018 Sep 05 | |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
8.8
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
86
± 10
km [*D]
| |
geometric albedo: |
0.072
[*D]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
1.7x1017
kg [W22b]
| |
density ρ: |
(0.75
± 0.25
g/cm3) [*A]
| |
Hill radius rH: |
210000 km [*E]
|
other data, primary:
|
diameter dp: |
61
± 7
km [W22b]
| |
rotation period RPp: |
46.6
± 0.05
h [W22b]
| |
amplitude in mag., rotational ΔM: |
?
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
61
± 7
km [W22b]
| |
diameter ratio ds/dp: |
1
[*D]
| |
component mag. difference ΔM: |
0
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
2011 JY31
--discovery and notes:
Primary discovered
2011 May 04
from
Magellan/Clay
by
New Horizons KBO Search.
Linked to prediscovery observations from 2011 Apr 28.
Companion discovered
2018 Sep 05
by H. A. Weaver, S. B. Porter, J. R. Spencer, and New Horizons Science Team
using
observations from New Horizons.
Announced
2022 Jan 16 [W22b].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2022
by Wm. Robert Johnston.
Last modified
23 January 2022.
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