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:

© 2013-2017, 2019 by Wm. Robert Johnston.
Last modified 1 December 2019.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.