Asteroids with Satellites Database--Johnston's Archive
(12326)
Shirasaki
compiled by Wm. Robert Johnston
last updated
19 February 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: |
2.2630859193 AU
| |
orbital period P: |
3.404486087 yr
(= 1243.5120287 d)
| |
eccentricity e: |
0.187820509
| |
perihelion distance q: |
1.83803197 AU
| |
aphelion distance Q: |
2.6881398678 AU
| |
inclination i: |
5.8417779°
| |
argument of perihelion ω: |
17.149225°
| |
ascending node Ω: |
3.010704°
| |
mean anomaly M: |
48.279715°
| |
perihelion passage TP: |
2016 Sep 02.232204
| |
Epoch: |
2017 Feb 16
| |
data arc: |
1975-2017
(1072 obs.)
| |
Earth MOID: |
0.841442 AU
| |
Jupiter Tisserand invariant TJ: |
3.588
|
orbital data, secondary:
|
semimajor axis as: |
8.4
km
[*E]
| |
separation/primary radius as/rp: | 4.5 [*E] | |
separation/Hill radius as/rH: | 0.016 [*E] | |
orbital period Ps: |
1.044
d [W17a]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
14.7
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
3.8
km [*E]
| |
geometric albedo: |
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
530 km [*E]
|
other data, primary:
|
diameter dp: |
3.7
km [*E]
| |
rotation period RPp: |
2.7286
h [W17a]
| |
amplitude in mag., rotational ΔM: |
0.12
[W17a]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
0.9
km [*E]
| |
diameter ratio ds/dp: |
0.24
[W17a]
| |
component mag. difference ΔM: |
?
| |
rotation period RPs: |
12.7
h [W17a]
| |
|
|
--
(12326) Shirasaki
--discovery and notes:
Primary discovered
1992 Sep 21
from
Kitami, Hokkaido, Japan
by
K. Endate and K. Watanabe.
Alternate designation(s):
1992 SF,
1975 TH2, 1994 EE9, 1997 AX24.
Linked to prediscovery observations from 1975 Oct 03.
Permanent number assigned 1999 Nov 23.
Named 2008 Jun 18 for Shuichi Shirasaki (1958-) [MPC63172].
Companion discovered
2016 Dec 06
by D. Pray, P. Pravec, V. Benishek, J. Oey, and V. Chiorny
using
lightcurve
observations from Sugarloaf Mountain Observatory, South Deerfield, MA; Sopot; Leura; Kharkiv Observatory.
Announced
2017 Jan 12 [P17a].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2017
by Wm. Robert Johnston.
Last modified
19 February 2017.
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