Asteroids with Satellites Database--Johnston's Archive

(4666) Dietz

compiled by Wm. Robert Johnston
last updated 27 November 2015

--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: 2.340531439 AU
orbital period P: 3.580731186 yr
(= 1307.886767 d)
eccentricity e: 0.233340874
perihelion distance q: 1.79438979 AU
aphelion distance Q: 2.886673091 AU
inclination i: 24.4928921°
argument of perihelion ω: 42.08632°
ascending node Ω: 230.228991°
mean anomaly M: 36.745483°
perihelion passage TP: 2015 Feb 13.502970
Epoch: 2015 Jun 27
data arc: 1986-2015 (803 obs.)
Earth MOID: 0.828518 AU
Jupiter Tisserand invariant TJ: 3.41


orbital data, secondary:
semimajor axis as: 12 km [*E]
separation/primary radius as/rp:3.5 [*D]
separation/Hill radius as/rH:0.013 [*D]
orbital period Ps: 0.693 d [P15h]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 12.8 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 6.83 ± 0.29 km [M11b]
geometric albedo: 0.239 ± 0.066 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 950 km [*E]

other data, primary:
diameter dp: 6.83 ± 0.29 km [M11b]
rotation period RPp: 2.95242 ± 0.00002 h [P15h]
amplitude in mag., rotational ΔM: 0.21 [P15h]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: ?
diameter ratio ds/dp: ?
component mag. difference ΔM: ?
rotation period RPs: ?

-- (4666) Dietz --discovery and notes:

Primary discovered 1986 May 04 from Palomar Observatory, California, USA by C. S. Shoemaker. Alternate designation(s): 1986 JA1 . Permanent number assigned 1990.

Named 1991 Jun 27 for Robert S. Dietz [MPC18461].

Companion discovered 2015 Sep 02 using lightcurve observations from Ondrejov Observatory. Announced 2015 Oct.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2015 by Wm. Robert Johnston.
Last modified 27 November 2015.
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