Asteroids with Satellites Database--Johnston's Archive

(6100) Kunitomoikkansai

compiled by Wm. Robert Johnston
last updated 30 December 2018

--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: 2.3298171814 AU
orbital period P: 3.55617206 yr
(= 1298.9163766 d)
eccentricity e: 0.133955877
perihelion distance q: 2.01772448 AU
aphelion distance Q: 2.641909886 AU
inclination i: 3.399468°
argument of perihelion ω: 69.227626°
ascending node Ω: 303.859376°
mean anomaly M: 296.556643°
perihelion passage TP: 2019 Dec 11.910043
Epoch: 2019 Apr 27
data arc: 1950-2018 (1510 obs.)
Earth MOID: 1.02006 AU
Jupiter Tisserand invariant TJ: 3.557


orbital data, secondary:
semimajor axis as: 7 km [*E]
separation/primary radius as/rp:3.7 [*E]
separation/Hill radius as/rH:0.010 [*E]
orbital period Ps: 0.7692 ± 0.0008 d [C18a]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.5 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 4.06 ± 0.19 km [M**]
geometric albedo: 0.468 ± 0.156 [M**]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 700 km [*E]

other data, primary:
diameter dp: 3.8 km [*D]
rotation period RPp: 4.3018 ± 0.0011 h [C18a]
amplitude in mag., rotational ΔM: 0.11 [C18a]
amplitude in mag., mutual events ΔM:0.21 ±0.06 [C18a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: >1.44 km [*D]
diameter ratio ds/dp: >0.38 [C18a]
component mag. difference ΔM: <2.1 [*D]
rotation period RPs: ?

-- (6100) Kunitomoikkansai --discovery and notes:

Primary discovered 1991 Nov 09 from Dynic Astronomical Observatory, Kyoto, Japan by A. Sugie. Alternate designation(s): 1991 VK4, 1987 RB2, 1987 SB16. Linked to prediscovery observations from 1950 Apr 17. Permanent number assigned 1994 Sep 19.

Named 1998 Dec 08 for Ikkansai Kunitomo (1778-1840) [MPC033385].

Companion discovered 2016 Dec by M. Conjat, F. Colas, R. Montaigut, R. Behrend, M. Devogele, B. Carry, D. Vernet, and J.-P. Rivet using lightcurve observations from Nice Observatory, Pic du Midi Observatory, and Calern Observatory. Announced 2018 Oct 23 [C18a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2018 by Wm. Robert Johnston.
Last modified 30 December 2018.
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