Asteroids with Satellites Database--Johnston's Archive
(11217)
1999 JC4
compiled by Wm. Robert Johnston
last updated
9 October 2021
--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:
main belt asteroid, inner
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
1.9439977226 AU
| |
orbital period P: |
2.710515093 yr
(= 990.0156379 d)
| |
eccentricity e: |
0.069697416
| |
perihelion distance q: |
1.808506105 AU
| |
aphelion distance Q: |
2.0794893398 AU
| |
inclination i: |
19.2909357°
| |
argument of perihelion ω: |
69.948427°
| |
ascending node Ω: |
224.6352392°
| |
mean anomaly M: |
352.028081°
| |
perihelion passage TP: |
2021 Jul 22.923125
| |
Epoch: |
2021 Jul 01
| |
data arc: |
1978-2021
(1395 obs.)
| |
Earth MOID: |
0.851879 AU
| |
Jupiter Tisserand invariant TJ: |
3.828
|
orbital data, secondary:
|
semimajor axis as: |
5.9
km
[*E]
| |
separation/primary radius as/rp: | 3.8 [*E] | |
separation/Hill radius as/rH: | 0.014 [*E] | |
orbital period Ps: |
0.7988
± 0.0004
d [W14a]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
15.15
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
3.1
km [*E]
| |
geometric albedo: |
(0.16
) [*A]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
430 km [*E]
|
other data, primary:
|
diameter dp: |
3.08
km [*E]
| |
rotation period RPp: |
4.8219
± 0.0004
h [W14a]
| |
amplitude in mag., rotational ΔM: |
0.11
± 0.01
[W14a]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
?
| |
diameter ratio ds/dp: |
?
| |
component mag. difference ΔM: |
?
| |
rotation period RPs: |
9.584
h [P16d]
| |
|
|
--
(11217) 1999 JC4
--discovery and notes:
Primary discovered
1999 May 10
from
Socorro, New Mexico, USA
by
LINEAR Program.
Alternate designation(s):
1978 WZ20, 1989 UM2.
Linked to prediscovery observations from 1978 Nov 28.
Permanent number assigned 1999 Jul 28.
Companion discovered
2013 Jul 07
by B. D. Warner
using
lightcurve
observations from Palmer Divide Observatory, Colorado Springs, Colorado, USA.
Announced
2013 Dec [W14a].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2014, 2021
by Wm. Robert Johnston.
Last modified
9 October 2021.
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