Asteroids with Satellites Database--Johnston's Archive

(3951) Zichichi

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: 2.339662074 AU
orbital period P: 3.578803925 yr
(= 1307.1581340 d)
eccentricity e: 0.173971564
perihelion distance q: 1.93262740 AU
aphelion distance Q: 2.746696744 AU
inclination i: 5.4152373°
argument of perihelion ω: 151.973843°
ascending node Ω: 270.077545°
mean anomaly M: 24.148928°
perihelion passage TP: 2014 Feb 24.31536
Epoch: 2014 May 23
data arc: 1938-2014 (1214 obs.)
Earth MOID: 0.946767 AU
Jupiter Tisserand invariant TJ: 3.539

orbital data, secondary:
binary dynamical type:A [M09a]
semimajor axis as: 16 km [*E]
separation/primary radius as/rp:5.0 [*E]
separation/Hill radius as/rH:0.016 [*E]
orbital period Ps: 1.15 ± 0.0004 d [A11a]
eccentricity es: ?
normalized ang. mom. αL: 0.86 [M09a]

other data, system (combined):
absolute mag. H: 12.7 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 6.72 ± 0.21 km [M12b]
geometric albedo: 0.325 ± 0.05 [M12b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 970 km [*E]

other data, primary:
diameter dp: 6.38 ± 0.2 km [*D]
rotation period RPp: 3.39423 ± 0.00007 h [A11a]
amplitude in mag., rotational ΔM: 0.29 ± 0.03 [A11a]
amplitude in mag., mutual events ΔM:0.175 ±0.055 [A11a]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 2.11 km [*D]
diameter ratio ds/dp: >0.33 [A11a]
component mag. difference ΔM: <2.4 [*D]
rotation period RPs: ?

-- (3951) Zichichi --discovery and notes:

Primary discovered 1986 Feb 13 from Osservatorio San Vittore, Bologna, Italy by ?. Alternate designation(s): 1986 CK1, 1938 UG, 1976 JG9, 1979 DR, 1981 UJ12, 1986 AU2. Linked to prediscovery observations from 1938 Oct 16. Permanent number assigned 1988 Dec 23.

Named 1989 May 20 for Antonio Zichichi (1929-) [MPC14634].

Companion discovered 2006 Nov 29 by P. Antonini, R. Behrend, F. Colas and J. Lecacheux, R. Goncalves, D. Starkey, F. Manzini, V. Reddy, H. Hamanowa, H. Hamanowa, and R. Naves using lightcurve observations from Bedoin, France; Geneva Observatory; Paris Observatory; Linhaceira, Portugal; Auburn, Indiana, USA; Sozzago, Italy; University of North Dakota; Motomiya, Fukushima, Japan; Barcelona, Spain. Announced 2011 Apr 14 [A11a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2011, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
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