Asteroids with Satellites Database--Johnston's Archive

(4029) Bridges

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: 2.525421064 AU
orbital period P: 4.013367228 yr
(= 1465.882380 d)
eccentricity e: 0.130959059
perihelion distance q: 2.19469430 AU
aphelion distance Q: 2.856147829 AU
inclination i: 5.4370864°
argument of perihelion ω: 16.672823°
ascending node Ω: 214.796995°
mean anomaly M: 353.163485°
perihelion passage TP: 2014 Jun 19.8375
Epoch: 2014 May 23
data arc: 1974-2014 (1385 obs.)
Earth MOID: 1.18506 AU
Jupiter Tisserand invariant TJ: 3.436


orbital data, secondary:
binary dynamical type:A [P07f]
semimajor axis as: 13 km [*E]
separation/primary radius as/rp:3.3 [*E]
separation/Hill radius as/rH:0.0097 [*E]
orbital period Ps: 0.6796 ± 0.0004 d [H06d]
eccentricity es: ?
normalized ang. mom. αL: 0.81 [P07f]

other data, system (combined):
absolute mag. H: 12.8 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 8.02 ± 0.07 km [M11b]
geometric albedo: 0.201 ± 0.015 [M11b]
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: 7.8 ± 0.07 km [*D]
rotation period RPp: 3.5746 ± 0.0001 h [H06d]
amplitude in mag., rotational ΔM: 0.20 [H06d]
amplitude in mag., mutual events ΔM:0.09 ±0.03 [H06d]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 1.87 ± 0.16 km [*D]
diameter ratio ds/dp: 0.24 ± 0.02 [H06d]
component mag. difference ΔM: 3.1 ± 0.2 [*D]
rotation period RPs: ?

-- (4029) Bridges --discovery and notes:

Primary discovered 1982 May 24 from Palomar Observatory, California, USA by C. S. Shoemaker. Alternate designation(s): 1982 KC1, 1974 HS2, 1975 TQ, 1978 AF, 1978 JJ2, 1982 OX, 1986 JF. Linked to prediscovery observations from 1974 Apr 24. Permanent number assigned 1989 Mar 22.

Named 1989 Dec 12 for Patricia M. Bridges [MPC15575].

Companion discovered 2006 Apr 11 by D. Higgins, P. Pravec, P. Kusnirak, W. Cooney, J. Gross, D. Terrell, and R. Stephens using lightcurve observations from Canberra, Australia; Ondrejov Observatory, Czech Republic; Sonoita Research Observatory, Sonoita, Arizona, USA; Yucca Valley, California, USA. Announced 2006 May 08 [H06d].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2006-2008, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
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