Asteroids with Satellites Database--Johnston's Archive

(1803) Zwicky

compiled by Wm. Robert Johnston
last updated 14 March 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: 2.3498296882 AU
orbital period P: 3.602090166 yr
(= 1315.6882815 d)
eccentricity e: 0.24740712
perihelion distance q: 1.768465094 AU
aphelion distance Q: 2.9311942828 AU
inclination i: 21.5530535°
argument of perihelion ω: 253.959849°
ascending node Ω: 337.241963°
mean anomaly M: 284.9657494°
perihelion passage TP: 2021 Sep 17.226900
Epoch: 2020 Dec 17
data arc: 1931-2021 (2786 obs.)
Earth MOID: 0.881755 AU
Jupiter Tisserand invariant TJ: 3.426


orbital data, secondary:
semimajor axis as: 24 km [*E]
separation/primary radius as/rp:5.0 [*E]
separation/Hill radius as/rH:0.018 [*E]
orbital period Ps: 1.1858 ± 0.0008 d [P21b]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 12.23 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 9.93 ± 0.08 km [M**]
geometric albedo: 0.259 ± 0.038 [M**]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 1300 km [*E]

other data, primary:
diameter dp: 9.61 ± 0.08 km [*D]
rotation period RPp: 2.7329 ± 0.0002 h [P21b]
amplitude in mag., rotational ΔM: 0.14 [P21b]
amplitude in mag., mutual events ΔM:0.105 ±0.035 [P21b]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 2.50 ± 0.19 km [*D]
diameter ratio ds/dp: 0.26 ± 0.02 [P21b]
component mag. difference ΔM: 2.93 ± 0.17 [*D]
rotation period RPs: ?

-- (1803) Zwicky --discovery and notes:

Primary discovered 1967 Feb 06 from Zimmerwald, Switzerland by P. Wild. Alternate designation(s): 1967 CA, 1931 DL. Linked to prediscovery observations from 1931 Feb 17. Permanent number assigned -.

Named 1977 Apr 18 for Fritz Zwicky (1898-1974) [MPC004156].

Companion discovered 2021 Feb 21 using lightcurve observations from Command Module Observatory, Tempe, Arizona, USA; Center for Solar System Studies, California, USA. Announced 2021 Mar 08 [P21b].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2021 by Wm. Robert Johnston.
Last modified 14 March 2021.
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