Asteroids with Satellites Database--Johnston's Archive

(612095) 1999 OJ4

compiled by Wm. Robert Johnston
last updated 10 April 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: TNO


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 38.1066 AU
orbital period P: 235.234 yr
(= 85920.7 d)
eccentricity e: 0.02379
perihelion distance q: 37.2002 AU
aphelion distance Q: 39.0129 AU
inclination i: 3.99543°
argument of perihelion ω: 285.6834°
ascending node Ω: 127.4445°
mean anomaly M: 294.6214°
perihelion passage TP: 2062 Jan 14.8
Epoch: 2019 Apr 27
data arc: 1999-2008 (63 obs.)
Earth MOID: 36.2133 AU
Jupiter Tisserand invariant TJ: 5.534
Neptune Tisserand invariant TN:3.034 [*D]


orbital data, secondary:
semimajor axis as: 3306 ± 17 km [G19b]
separation/primary radius as/rp:88.16 [*D]
separation/Hill radius as/rH:0.015 [*D]
orbital period Ps: 84.1147 ± 0.005 d [G19b]
eccentricity es: 0.3683 ± 0.0038 [G19b]
inclination is:53.61° ± 0.72° [G19b]
ascending node Ωs:276° ± 1.3° [G19b]
argument of pericenter ωs:330.2° ± 0.61° [G19b]
mean anomaly M:37.45° ± 0.9° [G19b]
Epoch:2006 Sep 21.5
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 7.1 [MPC]
7.344 ± 0.012 [G09a]
slope parameter G: (0.15) [*A]
effective diameter dE: 104 km [*D]
geometric albedo: 0.215 ± 0.095/0.095 [G09a]
color index U-B: ?
color index B-V: 0.988 [P04a]
color index V-R:0.682 ± 0.05 [P04a]
color index B-R:1.675 ± 0.077 [P04a]
color index V-I:1.2 [P04a]
taxonomic type: RR? (G-mode) [B05b]
mass m: 4.05x1017 ± 6.3x1015 kg [G19b]
density ρ: (1 ± 1/0.5 g/cm3) [*A]
Hill radius rH: 230000 km [*D]

other data, primary:
diameter dp: 75 ± 17 km [G09a]
color index V-I:1.25 ± 0.11 [B08d]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 72 ± 16 km [*D]
diameter ratio ds/dp: 0.96 ± 0.009 [G09a]
component mag. difference ΔM: 0.088 ± 0.02 [G09a]
color index V-I:1.37± 0.24 [B08d]
rotation period RPs: ?

-- (612095) 1999 OJ4 --discovery and notes:

Primary discovered 1999 Jul 18 from Mauna Kea Observatory, Hawaii, USA by ?. Permanent number assigned 28 Mar 2022.

Companion discovered 2002 Oct 04 using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2005 Oct 06.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2005-2019, 2022 by Wm. Robert Johnston.
Last modified 10 April 2022.
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