Asteroids with Satellites Database--Johnston's Archive
(8306)
Shoko
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: |
2.242117427 AU
| |
orbital period P: |
3.357343162 yr
(= 1226.2695900 d)
| |
eccentricity e: |
0.219825063
| |
perihelion distance q: |
1.74924382 AU
| |
aphelion distance Q: |
2.734991031 AU
| |
inclination i: |
4.7766350°
| |
argument of perihelion ω: |
143.265200°
| |
ascending node Ω: |
208.771711°
| |
mean anomaly M: |
75.895032°
| |
perihelion passage TP: |
2013 Sep 06.47841
| |
Epoch: |
2014 May 23
| |
data arc: |
1986-2014
(871 obs.)
| |
Earth MOID: |
0.745609 AU
| |
Jupiter Tisserand invariant TJ: |
3.597
|
orbital data, secondary:
|
semimajor axis as: |
9.4
km
[*E]
| |
separation/primary radius as/rp: | 5.9 [*E] | |
separation/Hill radius as/rH: | 0.021 [*E] | |
orbital period Ps: |
1.508
± 0.0017
d [P13a]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
14.9
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
3.46
km [*E]
| |
geometric albedo: |
(0.16
) [*A]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
450 km [*E]
|
other data, primary:
|
diameter dp: |
3.21
km [*E]
| |
rotation period RPp: |
3.350
± 0.000
h [P13a]
| |
amplitude in mag., rotational ΔM: |
0.10
± 0.01
[P14a]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
1.28
km [*E]
| |
diameter ratio ds/dp: |
>0.40
[P13a]
| |
component mag. difference ΔM: |
<2.0
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(8306) Shoko
--discovery and notes:
Primary discovered
1995 Feb 24
from
Kuma Kogen, Japan
by
A. Nakamura.
Alternate designation(s):
1995 DY1,
1986 QA6.
Linked to prediscovery observations from 1986 Aug 26.
Permanent number assigned 1998 Feb 11.
Named 1998 Jun 10 for Shoko Sawada (1962-) [MPC32095].
Companion discovered
2013 Sep
using
lightcurve
observations.
Announced
2013 Dec 28.
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Polishook, David 2014, Minor Planet Bulletin Spins, Lightcurves, and Binarity of Eight Asteroid Pairs: 4905, 7745, 8306 16815, 17288, 26416, 42946, and 74096
- Pravec, P., Kusnirak, P., Hornoch, K., Galad, A., Krugly, Yu. N., Chiorny, V., Inasaridze, R., Kvaratskhelia, O., Ayvazian, V., Parmonov, O., Pollock, J., Mottola, S., Oey, J., Pray, D., Zizka, J., Vrastil, J., Molotov, I., Reichart, D. E., Ivarsen, K. M., Haislip, J. B., & LaCluyze, A. 2013, International Astronomical Union Circular (8306) Shoko
©
2014
by Wm. Robert Johnston.
Last modified
21 September 2014.
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