Asteroids with Satellites Database--Johnston's Archive
(20325)
Julianoey
compiled by Wm. Robert Johnston
last updated
29 May 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:
main belt asteroid
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
2.378629142 AU
| |
orbital period P: |
3.668513343 yr
(= 1339.949806 d)
| |
eccentricity e: |
0.076478504
| |
perihelion distance q: |
2.19671514 AU
| |
aphelion distance Q: |
2.560543142 AU
| |
inclination i: |
6.1028942°
| |
argument of perihelion ω: |
256.319553°
| |
ascending node Ω: |
98.235495°
| |
mean anomaly M: |
71.285368°
| |
perihelion passage TP: |
2014 Mar 18.6700
| |
Epoch: |
2014 Dec 09
| |
data arc: |
1954-2013
(1065 obs.)
| |
Earth MOID: |
1.20093 AU
| |
Jupiter Tisserand invariant TJ: |
3.528
|
orbital data, secondary:
|
semimajor axis as: |
10
km
[*E]
| |
separation/primary radius as/rp: | 4.2 [*E] | |
separation/Hill radius as/rH: | 0.012 [*E] | |
orbital period Ps: |
0.9808
± 0.0004
d [P14d]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
13.1
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
4.94
± 1.01
km [M11b]
| |
geometric albedo: |
0.416
± 0.172
[M11b]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
820 km [*E]
|
other data, primary:
|
diameter dp: |
4.73
± 1.01
km [*D]
| |
rotation period RPp: |
3.24474
h [W17a]
| |
amplitude in mag., rotational ΔM: |
0.13
[W17a]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
1.42
± 0.31
km [*D]
| |
diameter ratio ds/dp: |
0.3
± 0.02
[W17a]
| |
component mag. difference ΔM: |
2.61
± 0.14
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(20325) Julianoey
--discovery and notes:
Primary discovered
1998 Apr 21
from
Kitt Peak Observatory, Arizona, USA
by
Spacewatch Program.
Alternate designation(s):
1998 HO27,
1977 TT6, 2004 BB159.
Linked to prediscovery observations from 1954 May 28.
Permanent number assigned 2001 Jan 09.
Named 2016 Jun 20 for Julian Oey (1964-) [MPC100606].
Companion discovered
2014
by D. Pray, P. Pravec, V. Benishek, J. Pollock, W. Cooney, J. Gross, D. Terrell, D. E. Reichart, J. B. Haislip, A. P. LaCluyze, A. Verveer and T. Spuck
using
lightcurve
observations.
Announced
2014 Dec 24 [P14d].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2014-2017, 2019
by Wm. Robert Johnston.
Last modified
29 May 2019.
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