Asteroids with Satellites Database--Johnston's Archive
(7888)
1993 UC
compiled by Wm. Robert Johnston
last updated
1 December 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:
NEA, Apollo
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
2.436119943 AU
| |
orbital period P: |
3.802386005 yr
(= 1388.821488 d)
| |
eccentricity e: |
0.664200014
| |
perihelion distance q: |
0.818049043 AU
| |
aphelion distance Q: |
4.054190842 AU
| |
inclination i: |
26.07361808°
| |
argument of perihelion ω: |
323.0354136°
| |
ascending node Ω: |
165.9377818°
| |
mean anomaly M: |
118.8294006°
| |
perihelion passage TP: |
2013 Feb 18.575486
| |
Epoch: |
2014 May 23
| |
data arc: |
1989-2013
(851 obs.)
| |
Earth MOID: |
0.0888028 AU
| |
Jupiter Tisserand invariant TJ: |
3.055
|
orbital data, secondary:
|
semimajor axis as: |
7.7
km
[*E]
| |
separation/primary radius as/rp: | 5.7 [*E] | |
separation/Hill radius as/rH: | 0.044 [*E] | |
orbital period Ps: |
1.46
d [W17a]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
15.1
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
2.72
km [H11b]
| |
geometric albedo: |
0.16
[H11b]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
U (SMASSII) [JPL]
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
170 km [*E]
|
other data, primary:
|
diameter dp: |
2.72
km [H11b]
| |
rotation period RPp: |
2.34
± 0
h [P96a]
| |
amplitude in mag., rotational ΔM: |
?
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
?
| |
diameter ratio ds/dp: |
?
| |
component mag. difference ΔM: |
?
| |
rotation period RPs: |
?
| |
|
|
--
(7888) 1993 UC
--discovery and notes:
Primary discovered
1993 Oct 20
from
Siding Spring Observatory, New South Wales, Australia
by
R. H. McNaught.
Linked to prediscovery observations from 1989 Oct 28.
Permanent number assigned 1997 Sep 16.
Companion discovered
2013 Mar
by B. D. Warner and D. P. Pray
using
radar
observations from Arecibo Observatory, Puerto Rico; Goldstone, California, USA.
Announced
2013 Mar [B13f].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Pravec, Petr, Šarounová, Lenka, & Wolf, Marek 1996, Icarus Lightcurves of 7 Near-Earth Asteroids
- Skiff, B. A., Buie, M. W., & Bowell, E. 1996, Bulletin of the American Astronomical Society Near-Earth Asteroid Physical Observations: 1993-1995
©
2013-2017, 2019
by Wm. Robert Johnston.
Last modified
1 December 2019.
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