Asteroids with Satellites Database--Johnston's Archive

(7307) Takei

compiled by Wm. Robert Johnston
last updated 11 June 2021

--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: 2.740462141 AU
orbital period P: 4.53665455 yr
(= 1657.044368 d)
eccentricity e: 0.087150769
perihelion distance q: 2.501628759 AU
aphelion distance Q: 2.979295523 AU
inclination i: 6.99059915°
argument of perihelion ω: 119.941497°
ascending node Ω: 42.9867734°
mean anomaly M: 356.7805283°
perihelion passage TP: 2020 Dec 31.818910
Epoch: 2020 Dec 17
data arc: 1978-2021 (3614 obs.)
Earth MOID: 1.51701 AU
Jupiter Tisserand invariant TJ: 3.334


orbital data, secondary:
semimajor axis as: 19 km [*E]
separation/primary radius as/rp:3.9 [*E]
separation/Hill radius as/rH:0.0099 [*E]
orbital period Ps: 0.8336 ± 0.0001
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 12.57 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 10.1 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: 1920 km [*E]

other data, primary:
diameter dp: 9.8 km [*E]
rotation period RPp: 2.74685 ± 0.00006
amplitude in mag., rotational ΔM: 0.19
amplitude in mag., mutual events ΔM:0.09 ±0.03
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 2.6 km [*E]
diameter ratio ds/dp: >0.24
component mag. difference ΔM: <3.1 [*D]
rotation period RPs: 20.007 ± 0.003

-- (7307) Takei --discovery and notes:

Primary discovered 1994 Apr 13 from Nachi-Katsurra by Y. Shimizu and T. Urata. Alternate designation(s): 1994 GT9, 1978 VJ16, 1985 GJ1, 1985 JW, 1991 RQ20. Linked to prediscovery observations from 1978 Nov 01. Permanent number assigned 1996 Nov 25.

Named 2007 Sep 26 for George Takei (1937-) [MPC060728].

Companion discovered using lightcurve observations. Announced 2021 May 30.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2021 by Wm. Robert Johnston.
Last modified 11 June 2021.
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