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:
- Higgins, David, Oey, Julian, & Pravec, Petr 2011, Minor Planet Bulletin Period Determination of Binary Asteroid Targets Observed at Hunters Hill Observatory: May-September 2009
- Higgins, D., Pravec, P., Kusnirak, P., Cooney, W., Gross, J., Terrell, D., & Stephens, R. 2006, Central Bureau Electronic Telegrams (4029) Bridges
©
2006-2008, 2014
by Wm. Robert Johnston.
Last modified
21 September 2014.
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