Asteroids with Satellites Database--Johnston's Archive
(7335)
1989 JA
compiled by Wm. Robert Johnston
last updated
15 June 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:
NEA, Apollo
(PHA)
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
1.7707400687 AU
| |
orbital period P: |
2.3563533943 yr
(= 860.65807725 d)
| |
eccentricity e: |
0.484138183
| |
perihelion distance q: |
0.913457189 AU
| |
aphelion distance Q: |
2.6280229481 AU
| |
inclination i: |
15.1918578°
| |
argument of perihelion ω: |
232.3058384°
| |
ascending node Ω: |
61.3009013°
| |
mean anomaly M: |
291.127021°
| |
perihelion passage TP: |
2022 Jul 04.6557936
| |
Epoch: |
2022 Jan 21
| |
data arc: |
1989-2022
(1799 obs.)
| |
Earth MOID: |
0.0227965 AU
| |
Jupiter Tisserand invariant TJ: |
3.924
|
orbital data, secondary:
|
semimajor axis as: |
1.2
km
[*E]
| |
separation/primary radius as/rp: | 4.2 [*E] | |
separation/Hill radius as/rH: | 0.029 [*E] | |
orbital period Ps: |
0.9
± 0.1
d [P22c]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
17.59
[MPC]
17.81 ± 0.26 [P22c]
| |
slope parameter G: |
(0.3) [*A]
| |
effective diameter dE: |
0.6
km [*D]
| |
geometric albedo: |
0.448
± 0.043
[N16c]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
color index V-R: | 0.42 ± 0.012 [P22c] | |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
41 km [*E]
|
other data, primary:
|
diameter dp: |
0.57
± 0.11
km [B22h]
| |
rotation period RPp: |
2.5899
± 0.00003
h [P22c]
| |
amplitude in mag., rotational ΔM: |
0.12
[P22c]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
0.2
km [*E]
| |
diameter ratio ds/dp: |
0.35
[*D]
| |
component mag. difference ΔM: |
2.3
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(7335) 1989 JA
--discovery and notes:
Primary discovered
1989 May 01
from
Palomar Observatory, California, USA
by
E. F. Helin.
Linked to prediscovery observations from 1989 Apr 06.
Permanent number assigned 1996 Dec 24.
Companion discovered
2022 May
by Pravec, P. et al.
using
observations from Goldstone Observatory, California, USA.
Announced
2022 May [B22h].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2022
by Wm. Robert Johnston.
Last modified
15 June 2022.
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