Asteroids with Satellites Database--Johnston's Archive
(6181)
Bobweber
compiled by Wm. Robert Johnston
last updated
16 July 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: |
2.430241592 AU
| |
orbital period P: |
yr
(= 1383.797688 d)
| |
eccentricity e: |
0.23877596
| |
perihelion distance q: |
1.84995832 AU
| |
aphelion distance Q: |
3.01052486 AU
| |
inclination i: |
7.569039°
| |
argument of perihelion ω: |
93.589287°
| |
ascending node Ω: |
303.653205°
| |
mean anomaly M: |
30.628487°
| |
perihelion passage TP: |
2017 May 09.267696
| |
Epoch: |
2017 Sep 04
| |
data arc: |
1954-2016
(1077 obs.)
| |
Earth MOID: |
0.87563 AU
| |
Jupiter Tisserand invariant TJ: |
3.457
|
orbital data, secondary:
|
semimajor axis as: |
?
| |
orbital period Ps: |
?
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
13.6
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
4.49
± 0.05
km [M11b]
| |
geometric albedo: |
0.421
± 0.045
[M11b]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
650 km [*E]
|
other data, primary:
|
diameter dp: |
4.49
± 0.05
km [M11b]
| |
rotation period RPp: |
2.75796
h [JPL]
| |
amplitude in mag., rotational ΔM: |
?
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
?
| |
diameter ratio ds/dp: |
?
| |
component mag. difference ΔM: |
?
| |
rotation period RPs: |
?
| |
|
|
--
(6181) Bobweber
--discovery and notes:
Primary discovered
1986 Sep 06
from
Palomar Observatory, California, USA
by
E. F. Helin.
Alternate designation(s):
1986 RW,
1979 YU8, 1990 WL2.
Linked to prediscovery observations from 1954 Mar 28.
Permanent number assigned 1994 Dec 18.
Named 2008 Mar 21 for Robert Weber (1926-2008) [MPC62353].
Companion discovered
using
lightcurve
observations.
Announced
2015 Dec.
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2017
by Wm. Robert Johnston.
Last modified
16 July 2017.
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