Asteroids with Satellites Database--Johnston's Archive
(43008)
1999 UD31
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: |
2.348350145 AU
| |
orbital period P: |
3.59868868 yr
(= 1314.445865 d)
| |
eccentricity e: |
0.18885934
| |
perihelion distance q: |
1.90484229 AU
| |
aphelion distance Q: |
2.791858003 AU
| |
inclination i: |
1.9673061°
| |
argument of perihelion ω: |
203.64521°
| |
ascending node Ω: |
126.24226°
| |
mean anomaly M: |
110.827253°
| |
perihelion passage TP: |
2013 Oct 30.343265
| |
Epoch: |
2014 Dec 09
| |
data arc: |
1996-2015
(704 obs.)
| |
Earth MOID: |
0.894669 AU
| |
Jupiter Tisserand invariant TJ: |
3.534
|
orbital data, secondary:
|
semimajor axis as: |
3.9
km
[*E]
| |
separation/primary radius as/rp: | 3.5 [*E] | |
separation/Hill radius as/rH: | 0.012 [*E] | |
orbital period Ps: |
0.6977
± 0.0002
d [W17a]
| |
eccentricity es: |
0
[P15f]
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
15.6
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
2.39
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: |
340 km [*E]
|
other data, primary:
|
diameter dp: |
2.22
km [*E]
| |
rotation period RPp: |
2.9
± 0.5
h [P15f]
| |
amplitude in mag., rotational ΔM: |
?
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
0.89
km [*E]
| |
diameter ratio ds/dp: |
0.4
± 0.05
[W17a]
| |
component mag. difference ΔM: |
1.99
± 0.27
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(43008) 1999 UD31
--discovery and notes:
Primary discovered
1999 Oct 31
from
Kitt Peak Observatory, Arizona, USA
by
Spacewatch Program.
Alternate designation(s):
1996 XT18, 1999 RM105.
Linked to prediscovery observations from 1996 Dec 12.
Permanent number assigned 2002 Jun 24.
Companion discovered
2014
by Pravec, P., P. Scheirich, P. Kusnirak, K. Hornoch, and A. Galad
using
lightcurve
observations.
Announced
2015 Aug 05 [P15f].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2015, 2019
by Wm. Robert Johnston.
Last modified
29 May 2019.
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