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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