Asteroids with Satellites Database--Johnston's Archive
(5121)
Numazawa
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: |
2.230617386 AU
| |
orbital period P: |
3.331546096 yr
(= 1216.8472114 d)
| |
eccentricity e: |
0.170445538
| |
perihelion distance q: |
1.850418607 AU
| |
aphelion distance Q: |
2.6108161655 AU
| |
inclination i: |
6.4549291°
| |
argument of perihelion ω: |
20.8590152°
| |
ascending node Ω: |
358.2533503°
| |
mean anomaly M: |
49.7788199°
| |
perihelion passage TP: |
2021 Aug 05.741061
| |
Epoch: |
2022 Jan 21
| |
data arc: |
1941-2022
(2828 obs.)
| |
Earth MOID: |
0.85404 AU
| |
Jupiter Tisserand invariant TJ: |
3.615
|
orbital data, secondary:
|
semimajor axis as: |
12
km
[*E]
| |
separation/primary radius as/rp: | 3.4 [*E] | |
separation/Hill radius as/rH: | 0.010 [*E] | |
orbital period Ps: |
0.7158
± 0.0004
d [B22a]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
13.11
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
7.24
± 0.13
km [M12b]
| |
geometric albedo: |
0.256
± 0.029
[M12b]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
1200 km [*E]
|
other data, primary:
|
diameter dp: |
7.01
± 0.13
km [*D]
| |
rotation period RPp: |
2.6646
± 0.0002
h [B22a]
| |
amplitude in mag., rotational ΔM: |
0.13
[B22a]
| |
amplitude in mag., mutual events ΔM: | 0.105 ±0.035 [B22a] | |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
>1.82
km [*D]
| |
diameter ratio ds/dp: |
>0.26
[B22a]
| |
component mag. difference ΔM: |
<2.9
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(5121) Numazawa
--discovery and notes:
Primary discovered
1989 Jan 15
from
Kitami, Hokkaido, Japan
by
Yanai, Watanabe.
Alternate designation(s):
1989 AX1,
1941 WO, 1954 PA, 1984 QF1.
Linked to prediscovery observations from 1941 Nov 16.
Companion discovered
2021 Oct 20
by V. Benishek, P. Pravec, R. Durkee
using
lightcurve
observations from Sopot Observatory, Serbia; Chuguev station, Kharkiv Observatory, Ukraine; Shed of Science South Observatory, Pontotoc, Texas, USA.
Announced
2022 Feb 14 [B22a].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2022
by Wm. Robert Johnston.
Last modified
30 April 2022.
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