Asteroids with Satellites Database--Johnston's Archive

(6245) Ikufumi

compiled by Wm. Robert Johnston
last updated 2 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: 2.3018535357 AU
orbital period P: yr
(= 1275.6013102 d)
eccentricity e: 0.178136874
perihelion distance q: 1.891808543 AU
aphelion distance Q: 2.7118985286 AU
inclination i: 8.0151998°
argument of perihelion ω: 52.500066°
ascending node Ω: 299.724245°
mean anomaly M: 85.7835°
perihelion passage TP: 2018 Jun 27.040153
Epoch: 2019 Apr 27
data arc: 1954-2018 (1711 obs.)
Earth MOID: 0.896576 AU
Jupiter Tisserand invariant TJ: 3.557


orbital data, secondary:
semimajor axis as: ?
orbital period Ps: ?
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.2 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 8.1 ± 0.15 km [M**]
geometric albedo: 0.129 ± 0.025 [M**]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 1400 km [*E]

other data, primary:
diameter dp: 8.1 ± 0.15 km [M**]
rotation period RPp: ?
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: ?

-- (6245) Ikufumi --discovery and notes:

Primary discovered 1990 Sep 27 from Nihondaira Observatory by T. Urata. Alternate designation(s): 1990 SO4, 1978 EE8. Linked to prediscovery observations from 1954 May 24. Permanent number assigned 1995 Feb 15.

Named 1998 Jun 10 [MPC032094].

Companion discovered 2018 Nov using lightcurve observations. Announced 2018 Nov 27.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2018 by Wm. Robert Johnston.
Last modified 2 December 2018.
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