Asteroids with Satellites Database--Johnston's Archive
(7752)
Otauchunokai
compiled by Wm. Robert Johnston
last updated
23 September 2026
--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: |
2.29930308647 AU
| |
orbital period P: |
3.48660329062 yr
(= 1273.4818519 d)
| |
eccentricity e: |
0.15280582177
| |
perihelion distance q: |
1.94795618884 AU
| |
aphelion distance Q: |
2.6506499841 AU
| |
inclination i: |
3.795401945°
| |
argument of perihelion ω: |
77.30014026°
| |
ascending node Ω: |
280.24820661°
| |
mean anomaly M: |
322.25307449°
| |
perihelion passage TP: |
2026 Oct 20.52784611
| |
Epoch: |
2026 Jun 09
| |
data arc: |
1950-2026
(4910 obs.)
| |
Earth MOID: |
0.946827 AU
| |
Jupiter Tisserand invariant TJ: |
3.574
|
orbital data, secondary:
|
semimajor axis as: |
11
km
[*E]
| |
separation/primary radius as/rp: | 4.3 [*E] | |
separation/Hill radius as/rH: | 0.014 [*E] | |
orbital period Ps: |
0.9654
± 0.0004
d [B26n]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
13.6
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
5.44
± 0.13
km [M19a]
| |
geometric albedo: |
0.314
± 0.055
[M19a]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
800 km [*E]
|
other data, primary:
|
diameter dp: |
5.24
± 0.13
km [*D]
| |
axial ratios a/b, b/c: | 1.1, ? [*E] | |
rotation period RPp: |
2.7552
± 0.0002
h [B26n]
| |
amplitude in mag., rotational ΔM: |
0.08
[B26n]
| |
amplitude in mag., mutual events ΔM: | 0.08 [B26n] | |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
1.47
± 0.11
km [*D]
| |
diameter ratio ds/dp: |
0.28
± 0.02
[B26n]
| |
component mag. difference ΔM: |
2.76
± 0.16
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(7752) Otauchunokai
--discovery and notes:
Primary discovered
1988 Oct 31
from
Ojima, Gunma, Japan
by
T. Niijima and K. Kanai.
Alternate designation(s):
1988 US,
1953 TM2, 1981 UK12.
Linked to prediscovery observations from 1950 Dec 09.
Permanent number assigned 1997 Jul 20.
Named 2001 Jan 09 for an amateur astronomers' club in Ota city area, Gunma, Japan [MPC041935].
Companion discovered
2026 Aug 05
by V. Benishek, P. Pravec, P. Kusnirak, P. Fatka, R. Durkee, K. Ergashev, O. Burkhonov, and N. Todorovic
using
lightcurve
observations from Sopot Observatory, Serbia; Vidojevica Observatory, Serbia; Shed of Science South Observatory, Pontotoc, Texas, USA; Maidanak Observatory, Uzbekistan.
Announced
2026 Sep 22 [B26n].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2026
by Wm. Robert Johnston.
Last modified
23 September 2026.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.