Asteroids with Satellites Database--Johnston's Archive

(2623) Zech

compiled by Wm. Robert Johnston
last updated 19 February 2017

--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: 2.254786313 AU
orbital period P: 3.385774929 yr
(= 1236.6776491 d)
eccentricity e: 0.234039084
perihelion distance q: 1.72707819 AU
aphelion distance Q: 2.7824944368 AU
inclination i: 4.0567603°
argument of perihelion ω: 22.566453°
ascending node Ω: 349.134859°
mean anomaly M: 33.516632°
perihelion passage TP: 2014 Aug 15.863141
Epoch: 2014 Dec 09
data arc: 1919-2014 (1155 obs.)
Earth MOID: 0.727777 AU
Jupiter Tisserand invariant TJ: 3.584

orbital data, secondary:
semimajor axis as: 48 km [*E]
separation/primary radius as/rp:12.6 [*E]
separation/Hill radius as/rH:0.047 [*E]
orbital period Ps: 4.883 ± 0.012 d [P14c]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.1 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 7.92 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: 1000 km [*E]

other data, primary:
diameter dp: 7.61 km [*E]
rotation period RPp: 2.7401 ± 0.0002 h [P14c]
amplitude in mag., rotational ΔM: 0.22 [P14c]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: >2.21 km [*E]
diameter ratio ds/dp: >0.29 [P14c]
component mag. difference ΔM: ?
rotation period RPs: 18.718 ± 0.008 h [P14c]

-- (2623) Zech --discovery and notes:

Primary discovered 1919 Sep 22 from Heidelberg, Germany by K. Reinmuth. Alternate designation(s): A919 SA, 1963 RE. Permanent number assigned 1982.

Named 1992 Feb 18 for Gert Zech (1941-) [MPC19692].

Companion discovered 2014 Oct 7 by D. Pray, P. Pravec, V. Chiorny, Yu. N. Krugly, V. Benishek, J. Pollock, D. B. Caton, A. B. Smith, R. L. Hawkins, R. Inasaridze, R. Montaigut, A. Leroy, D. E. Reichart, J. B. Haislip, A. LaCluyze using lightcurve observations from Sugarloaf Mountain Observatory, South Deerfield, MA; Ondrejov Observatory; Kharkiv Observatory; Belgrade Observatory; Appalachian State Univ.; Abastumani Observatory; OPERA Observatory, France; Univ. of North Carolina, Chapel Hill, NC. Announced 2014 Nov 05 [P14c].

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© 2014, 2017 by Wm. Robert Johnston.
Last modified 19 February 2017.
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