Asteroids with Satellites Database--Johnston's Archive

(6244) Okamoto

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: 2.159377811 AU
orbital period P: 3.173227095 yr
(= 1159.0211970 d)
eccentricity e: 0.152704068
perihelion distance q: 1.82963204 AU
aphelion distance Q: 2.489123587 AU
inclination i: 5.3994636°
argument of perihelion ω: 51.515720°
ascending node Ω: 331.378291°
mean anomaly M: 133.678476°
perihelion passage TP: 2013 Mar 18.62170
Epoch: 2014 May 23
data arc: 1933-2014 (1202 obs.)
Earth MOID: 0.836487 AU
Jupiter Tisserand invariant TJ: 3.677


orbital data, secondary:
binary dynamical type:A [L14c]
semimajor axis as: 13 km [*E]
separation/primary radius as/rp:3.9 [*E]
separation/Hill radius as/rH:0.014 [*E]
orbital period Ps: 0.8467 ± 0.0004 d [H06a]
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: 6.89 km [*E]
geometric albedo: (0.16 ) [*A]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 960 km [*E]

other data, primary:
diameter dp: 6.69 km [*E]
rotation period RPp: 2.8958 ± 0.0001 h [H06a]
amplitude in mag., rotational ΔM: 0.11 [H06a]
amplitude in mag., mutual events ΔM:0.11 ±0.04 [H06a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 1.67 km [*E]
diameter ratio ds/dp: 0.25 ± 0.02 [H06a]
component mag. difference ΔM: 3.0 ± 0.2 [*D]
rotation period RPs: ?

-- (6244) Okamoto --discovery and notes:

Primary discovered 1990 Aug 20 from Geisei, Japan by T. Seki. Alternate designation(s): 1990 QF, 1952 SG1, 1987 SL25. Linked to prediscovery observations from 1933 Sep 27. Permanent number assigned 1995 Feb 15.

Named 1998 Jun 10 for Hiroshi Okamoto (1915-) [MPC32093].

Companion discovered 2006 Sep 26 by D. Higgins, D. Pray, P. Kusnirak, and P. Pravec using lightcurve observations from Canberra, Australia; Carbuncle Hill Observatory, Greene, Rhode Island, USA; Ondrejov Observatory, Czech Republic. Announced 2006 Oct 19 [H06a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2006-2008, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.