Asteroids with Satellites Database--Johnston's Archive

(8474) Rettig

compiled by Wm. Robert Johnston
last updated 30 July 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: 2.2243996779 AU
orbital period P: 3.317563431 yr
(= 1211.762929 d)
eccentricity e: 0.171476073
perihelion distance q: 1.84296836 AU
aphelion distance Q: 2.6058309986 AU
inclination i: 5.9110458°
argument of perihelion ω: 141.89143°
ascending node Ω: 132.660236°
mean anomaly M: 287.903029°
perihelion passage TP: 2015 Aug 08.678991
Epoch: 2014 Dec 09
data arc: 1955-2015 (1295 obs.)
Earth MOID: 0.832266 AU
Jupiter Tisserand invariant TJ: 3.621


orbital data, secondary:
semimajor axis as: 14 km [*E]
separation/primary radius as/rp:6.2 [*E]
separation/Hill radius as/rH:0.018 [*E]
orbital period Ps: 1.2725 ± 0.0004 d [C15b]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.7 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 6 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: 760 km [*E]

other data, primary:
diameter dp: 4.5 km [*E]
rotation period RPp: 30.54 ± 0.01 h [C15b]
amplitude in mag., rotational ΔM: 0.34 [C15b]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: >3.9 km [*E]
diameter ratio ds/dp: >0.86 [C15b]
component mag. difference ΔM: <0.3 [*D]
rotation period RPs: 30.54 ± 0.01 h [C15b]

-- (8474) Rettig --discovery and notes:

Primary discovered 1985 Apr 15 from Anderson Mesa Station, Arizona, USA by E. Bowell. Alternate designation(s): 1985 GA1, 1992 NQ. Linked to prediscovery observations from 1955 Apr 14. Permanent number assigned 1998 Apr 11.

Named 2000 Jan 24 for Terrence W. Rettig (1946-) [MPC38198].

Companion discovered 2015 May 19 by V. Chiorny, V. Benishek, P. Pravec, P. Kusnirak, Yu. N. Krugly, J. Oey, R. Groom, V. Reddy, D. Pray, W. Cooney, J. Gross, D. Terrell, V. Azyazian, V. Zhuzhanidze, R. Montaigut, A. Leroy, and I. Molotov using lightcurve observations from Kharkiv National University, Ukraine; Belgrade Astronomical Observatory, Serbia; Ondrejov Observatory, Czech Republic; Blue Mountains Observatory, Leura, New South Wales, Australia; Planetary Science Institute; Sugarloaf Mountain Observatory, South Deerfield, Massachusetts, United States; Sonoita Research Observatory, Sonoita, Arizona, United States; Southwest Research Institute; Abastumani Observatory; OPERA Observatory, France; Keldysh Institute of Applied Mathematics, Moscow, Russia. Announced 2015 Jul 26 [C15b].

--Links, more technical:

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© 2015 by Wm. Robert Johnston.
Last modified 30 July 2015.
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