Asteroids with Satellites Database--Johnston's Archive

(4666) Dietz and two satellites

compiled by Wm. Robert Johnston
last updated 23 September 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: 2.340452831 AU
orbital period P: 3.580550796 yr
(= 1307.8208782 d)
eccentricity e: 0.233706436
perihelion distance q: 1.79347394 AU
aphelion distance Q: 2.887431721 AU
inclination i: 24.498693°
argument of perihelion ω: 41.963332°
ascending node Ω: 230.225283°
mean anomaly M: 312.20495°
perihelion passage TP: 2018 Sep 12.631569
Epoch: 2018 Mar 23
data arc: 1986-2018 (1181 obs.)
Earth MOID: 0.827624 AU
Jupiter Tisserand invariant TJ: 3.41

orbital data, secondary:
semimajor axis as: 18 km [*E]
separation/primary radius as/rp:5.5 [*D]
separation/Hill radius as/rH:0.020 [*D]
orbital period Ps: 1.383 ± 0.004 d [O18a]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 12.8 [MPC]
slope parameter G: (0.24) [*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: 920 km [*E]

other data, primary:
diameter dp: 6.52 km [*D]
rotation period RPp: 2.95242 ± 0.00002 h [P15h]
amplitude in mag., rotational ΔM: 0.28 [O18a]
amplitude in mag., mutual events ΔM:0.12 [O18a]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: >2.22 km [*D]
diameter ratio ds/dp: >0.34 [O18a]
component mag. difference ΔM: <2.3 [*D]
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 Dec 02.

Named 1991 Jun 27 for Robert S. Dietz [MPC018461].

Second component discovered 2015 Sep 02 by J. Oey, P. Pravec, K. Hornoch, D. Pray, V. Benishek, R. Montaigut, A. Leroy, and J. Vilagi using lightcurve observations from Ondrejov Observatory, Czech Republic; Blue Mountains Observatory, Leura, New South Wales, Australia; Sugarloaf Mountain Observatory, South Deerfield, Massachusetts, USA; Belgrade Astronomical Observatory, Serbia; OPERA Observatory, France; Perth Observatory; Modra Observatory; JBL Observatory, Bathurst, New South Wales, Australia. Announced 2015 Oct.

Third component discovered 2015 Sep 02 by J. Oey, P. Pravec, K. Hornoch, D. Pray, V. Benishek, R. Montaigut, A. Leroy, and J. Vilagi using lightcurve observations from Ondrejov Observatory, Czech Republic; Blue Mountains Observatory, Leura, New South Wales, Australia; Sugarloaf Mountain Observatory, South Deerfield, Massachusetts, USA; Belgrade Astronomical Observatory, Serbia; OPERA Observatory, France; Perth Observatory; Modra Observatory; JBL Observatory, Bathurst, New South Wales, Australia. Announced 2018 Jul 20 [O18a].

--Links, more technical:

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--Links to ADS abstracts:

© 2015, 2018 by Wm. Robert Johnston.
Last modified 23 September 2018.
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