Asteroids with Satellites Database--Johnston's Archive
(4788)
Simpson
compiled by Wm. Robert Johnston
last updated
30 April 2022
--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: |
2.2626167213 AU
| |
orbital period P: |
3.4034273812 yr
(= 1243.1253289 d)
| |
eccentricity e: |
0.129443116
| |
perihelion distance q: |
1.969736563 AU
| |
aphelion distance Q: |
2.5554968799 AU
| |
inclination i: |
4.3187853°
| |
argument of perihelion ω: |
110.318461°
| |
ascending node Ω: |
277.176547°
| |
mean anomaly M: |
316.513479°
| |
perihelion passage TP: |
2020 Oct 28.164432
| |
Epoch: |
2020 May 31
| |
data arc: |
1976-2020
(2088 obs.)
| |
Earth MOID: |
0.979429 AU
| |
Jupiter Tisserand invariant TJ: |
3.604
|
orbital data, secondary:
|
semimajor axis as: |
5.7
km
[*E]
| |
separation/primary radius as/rp: | 3.2 [*E] | |
separation/Hill radius as/rH: | 0.011 [*E] | |
orbital period Ps: |
0.6242
± 0.0004
d [S21a]
| |
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: |
3.58
± 0.70
km [M12b]
| |
geometric albedo: |
0.500
± 0.174
[M12b]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
540 km [*E]
|
other data, primary:
|
diameter dp: |
3.53
km [*D]
| |
rotation period RPp: |
2.81752
± 0.00008
h [S21a]
| |
amplitude in mag., rotational ΔM: |
0.18
[S21a]
| |
amplitude in mag., mutual events ΔM: | 0.05 ±0.02 [S21a] | |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
>0.6
km [*D]
| |
diameter ratio ds/dp: |
>0.17
[S21a]
| |
component mag. difference ΔM: |
<3.8
[S21a]
| |
rotation period RPs: |
?
| |
|
|
--
(4788) Simpson
--discovery and notes:
Primary discovered
1986 Oct 04
from
Flagstaff, Arizona
by
E. Bowell.
Alternate designation(s):
1986 TL1,
1976 YJ1, 1979 RN1, 1984 AS.
Linked to prediscovery observations from 1976 Dec 16.
Permanent number assigned 1991 Apr 28.
Named 1991 Jun 27 for Robert W. L. Simpson (1921-1997) [MPC018465].
Companion discovered
2020 Dec
by P. Sogorb, et al.
using
lightcurve
observations.
Announced
2021 Jan 07 [S21a].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2021, 2022
by Wm. Robert Johnston.
Last modified
30 April 2022.
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