Asteroids with Satellites Database--Johnston's Archive

(4411) Kochibunkyo

compiled by Wm. Robert Johnston
last updated 30 April 2022

--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: 2.1672159197 AU
orbital period P: 3.1905200311 yr
(= 1165.3374414 d)
eccentricity e: 0.092309867
perihelion distance q: 1.967160506 AU
aphelion distance Q: 2.367271333 AU
inclination i: 2.25493975°
argument of perihelion ω: 11.008715°
ascending node Ω: 88.438932°
mean anomaly M: 29.174216°
perihelion passage TP: 2021 Oct 18.561650
Epoch: 2022 Jan 21
data arc: 1973-2022 (3417 obs.)
Earth MOID: 0.984017 AU
Jupiter Tisserand invariant TJ: 3.685


orbital data, secondary:
semimajor axis as: 6 km [*E]
separation/primary radius as/rp:2.8 [*E]
separation/Hill radius as/rH:0.0090 [*E]
orbital period Ps: 0.4994 ± 0.0004 d [B22b]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 14.08 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 4.43 ± 0.41 km [M11b]
geometric albedo: 0.271 ± 0.060 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 670 km [*E]

other data, primary:
diameter dp: 4.34 ± 0.40 km [*D]
rotation period RPp: 2.69614 ± 0.00006 h [B22b]
amplitude in mag., rotational ΔM: 0.16 [B22b]
amplitude in mag., mutual events ΔM:0.07 ±0.02 [B22b]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 0.91 ± 0.12 km [*D]
diameter ratio ds/dp: 0.21 ± 0.02 [B22b]
component mag. difference ΔM: 3.39 ± 0.21 [*D]
rotation period RPs: ?

-- (4411) Kochibunkyo --discovery and notes:

Primary discovered 1990 Jan 03 from Geisei, Japan by T. Seki. Alternate designation(s): 1990 AF, 1973 YL3, 1976 YP, 1979 TU2, 1979 WZ7, 1982 SF3. Linked to prediscovery observations from 1973 Dec 25. Permanent number assigned 1990 Mar 11.

Named 1995 Jul 12 for the Kochi association of education volunteers [MPC025443].

Companion discovered 2022 Feb 02 by V. Benishek, P. Pravec, and R. Durkee using lightcurve observations from Sopot Observatory, Serbia; Shed of Science South Observatory, Pontotoc, Texas, USA. Announced 2022 Apr 15 [B22b].

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--Links to ADS abstracts:


© 2022 by Wm. Robert Johnston.
Last modified 30 April 2022.
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