Asteroids with Satellites Database--Johnston's Archive
(4901)
O Briain
compiled by Wm. Robert Johnston
last updated
12 November 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: |
2.2743318325 AU
| |
orbital period P: |
3.429959146 yr
(= 1252.7925781 d)
| |
eccentricity e: |
0.1905918
| |
perihelion distance q: |
1.840862834 AU
| |
aphelion distance Q: |
2.707800831 AU
| |
inclination i: |
4.64188827°
| |
argument of perihelion ω: |
94.470454°
| |
ascending node Ω: |
227.1199045°
| |
mean anomaly M: |
3.6582203°
| |
perihelion passage TP: |
2022 Jul 27.269469
| |
Epoch: |
2022 Aug 09
| |
data arc: |
1950-2022
(2955 obs.)
| |
Earth MOID: |
0.835072 AU
| |
Jupiter Tisserand invariant TJ: |
3.582
|
orbital data, secondary:
|
semimajor axis as: |
18
km
[*E]
| |
separation/primary radius as/rp: | 7.2 [*E] | |
separation/Hill radius as/rH: | 0.020 [*E] | |
orbital period Ps: |
1.983
± 0.004
d [B22l]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
13.8
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
5.22
± 0.29
km [M**]
| |
geometric albedo: |
0.282
± 0.025
[M**]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
color index J-H: | 0.435 ± 0.041 [LMP] | |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
900 km [*E]
|
other data, primary:
|
diameter dp: |
5.03
km [*D]
| |
rotation period RPp: |
2.6498
± 0.0001
h [B22l]
| |
amplitude in mag., rotational ΔM: |
0.11
[B22l]
| |
amplitude in mag., mutual events ΔM: | 0.08 [B22l] | |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
>1.41
km [*D]
| |
diameter ratio ds/dp: |
>0.28
[B22l]
| |
component mag. difference ΔM: |
<2.8
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(4901) O Briain
--discovery and notes:
Primary discovered
1988 Nov 03
from
Yorii, Saitama, Japan
by
M. Arai and H. Mori.
Alternate designation(s):
1988 VJ,
1950 QS, 1974 SF2, 1977 KV1, 1981 UW13.
Linked to prediscovery observations from 1950 Aug 21.
Permanent number assigned 1991 Aug 25.
Named 2015 Jun 02 for Dara O Briain (1972-) [MPC094384].
Companion discovered
2022 Jul 14
by V. Benishek, P. Pravec, B. Warner, and J. Oey
using
lightcurve
observations from Sopot Observatory, Serbia; Center for Solar System Studies, Landers, California, USA; Blue Mountains Observatory, Leura, New South Wales, Australia.
Announced
2022 Nov 07 [B22l].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2022
by Wm. Robert Johnston.
Last modified
12 November 2022.
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