Asteroids with Satellites Database--Johnston's Archive

(5112) Kusaji

compiled by Wm. Robert Johnston
last updated 27 November 2016

--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: 2.174806534 AU
orbital period P: 3.207236189 yr
(= 1171.4651429 d)
eccentricity e: 0.130096161
perihelion distance q: 1.89187255 AU
aphelion distance Q: 2.457740516 AU
inclination i: 5.76423°
argument of perihelion ω: 341.558941°
ascending node Ω: 62.696346°
mean anomaly M: 329.562288°
perihelion passage TP: 2016 Nov 07.046439
Epoch: 2016 Jul 31
data arc: 1971-2016 (1060 obs.)
Earth MOID: 0.900662 AU
Jupiter Tisserand invariant TJ: 3.668


orbital data, secondary:
semimajor axis as: 7 km [*E]
separation/primary radius as/rp:4.23 [*E]
separation/Hill radius as/rH:0.014 [*E]
orbital period Ps: 0.8642 ± 0.0004 d [C16a]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.8 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 3.42 ± 0.13 km [JPL]
geometric albedo: 0.5 ± 0.081 [JPL]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 490 km [*E]

other data, primary:
diameter dp: 3.27 ± 0.13 km [*D]
rotation period RPp: 2.7995 ± 0.0001 h [C16a]
amplitude in mag., rotational ΔM: 0.12 [C16a]
amplitude in mag., mutual events ΔM:0.135 ±0.035 [C16a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 1.01 ± 0.08 km [*D]
axial ratios a/b, b/c:1.3;? []
diameter ratio ds/dp: 0.31 ± 0.02 [C16a]
component mag. difference ΔM: 2.5 ± 0.2 [*D]
rotation period RPs: 20.74 ± 0.01 h [C16a]

-- (5112) Kusaji --discovery and notes:

Primary discovered 1987 Sep 23 from Kushiro, Hokkaido, Japan by S. Ueda and H. Kaneda. Alternate designation(s): 1987 SM13, 1971 TK1, 1987 SL29, 1990 OV1. Linked to prediscovery observations from 1971 Oct 11. Permanent number assigned 1992 Mar 18.

Named 1993 Sep 01 for Shigeji Kusaji (1879-1956) [MPC22506].

Companion discovered 2016 Oct 25 by V. Chiorny, P. Pravec, D. Romeuf, R. Montaigut, A. Leroy, C. Gillier, V. Benishek, A. Marchini, R. Papini, F. Salvaggio, and J. Oey using lightcurve observations from Kharkiv Observatory, Ukraine; Pommier Observatory, France; OPERA Observatory; Sopot Observatory, Serbia; Astronomical Observatory of the University of Siena; Blue Mountains Observatory. Announced 2016 Nov 10 [C16a].

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--Links to ADS abstracts:


© 2016 by Wm. Robert Johnston.
Last modified 27 November 2016.
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