Asteroids with Satellites Database--Johnston's Archive

(15430) 1998 UR31

compiled by Wm. Robert Johnston
last updated 21 September 2014

--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: 2.222085701 AU
orbital period P: 3.312450595 yr
(= 1209.872580 d)
eccentricity e: 0.170166932
perihelion distance q: 1.84396019 AU
aphelion distance Q: 2.600211209 AU
inclination i: 8.1796138°
argument of perihelion ω: 177.528729°
ascending node Ω: 62.812845°
mean anomaly M: 66.525170°
perihelion passage TP: 2013 Oct 11.42505
Epoch: 2014 May 23
data arc: 1955-2013 (960 obs.)
Earth MOID: 0.831536 AU
Jupiter Tisserand invariant TJ: 3.616

orbital data, secondary:
semimajor axis as: 8.2 km [*E]
separation/primary radius as/rp:4.4 [*E]
separation/Hill radius as/rH:0.015 [*E]
orbital period Ps: 0.9983 d [O13a]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 14 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 3.74 ± 0.03 km [M11b]
geometric albedo: 0.29 ± 0.037 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 540 km [*E]

other data, primary:
diameter dp: 3.74 ± 0.03 km [M11b]
rotation period RPp: 2.5273 ± 0.0002 h [O13a]
amplitude in mag., rotational ΔM: 0.10 ± 0.04 [O13a]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: ?
diameter ratio ds/dp: ?
component mag. difference ΔM: ?
rotation period RPs: 23.96 h [O13a]

-- (15430) 1998 UR31 --discovery and notes:

Primary discovered 1998 Oct 22 from Xinglong, PR China by Beijing Schmidt CCD Asteroid Program. Alternate designation(s): 1980 EK1, 2000 AB153. Linked to prediscovery observations from 1955 Oct 25. Permanent number assigned 2000 Jun 21.

Companion discovered 2010 Apr 22 by J. Oey, R. Ya. Inasaridze, O. I. Kvaratskhelia, V. Ayvazian, V. G. Chiorny, Yu. N. Krugly, I. E. Molotov, B. D. Warner, P. Pravec, P. Kusnirak, D. Higgins, J. Pollock, J. Haislip, K. Ivarsen, D. Reichart, A. LaCluyze, and A. Galad using lightcurve observations. Announced 2013 Jul [O13a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2013, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
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