Asteroids with Satellites Database--Johnston's Archive

(612176) 2000 QL251

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, 1:2 resonance


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 47.7375 AU
orbital period P: 329.83 yr
(= 120472.6 d)
eccentricity e: 0.217899
perihelion distance q: 37.3356 AU
aphelion distance Q: 58.1395 AU
inclination i: 3.6849°
argument of perihelion ω: 98.4661°
ascending node Ω: 223.2326°
mean anomaly M: 38.2013°
perihelion passage TP: 1984 Apr 26.1
Epoch: 2019 Apr 27
data arc: 2000-2008 (52 obs.)
Earth MOID: 36.3243 AU
Jupiter Tisserand invariant TJ: 6.009
Neptune Tisserand invariant TN:3.084 [*D]


orbital data, secondary:
semimajor axis as: 4992 ± 16 km [G19b]
separation/primary radius as/rp:67 [*D]
separation/Hill radius as/rH:0.011 [*D]
orbital period Ps: 56.4495 ± 0.0039 d [G19b]
eccentricity es: 0.4893 ± 0.004 [G19b]
inclination is:127.69° ± 0.57° [G19b]
ascending node Ωs:109.24° ± 0.81° [G19b]
argument of pericenter ωs:151.66° ± 0.94° [G19b]
mean anomaly M:145.6° ± 1° [G19b]
Epoch:2007 Apr 09.5
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 6.8 [MPC]
7.148 ± 0.016 [G09a]
slope parameter G: (0.15) [*A]
effective diameter dE: 206 km [*D]
geometric albedo: 0.07 ± 0.03/0.03 [G09a]
color index U-B: ?
color index B-V: 0.87 [S12f]
color index V-R:0.49 ± 0.03 [S12f]
color index B-R:1.36 ± 0.04 [S12f]
color index V-I:0.97 [S12f]
taxonomic type: ?
mass m: 3.09x1018 ± 2.9x1016 kg [G19b]
density ρ: (1 ± 1/0.5 g/cm3) [*A]
Hill radius rH: 450000 km [*D]

other data, primary:
diameter dp: 148 ± 34 km [G09a]
color index V-I:0.85 ± 0.09 [B08d]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 143 ± 33 km [*D]
diameter ratio ds/dp: 0.967 ± 0.021 [G09a]
component mag. difference ΔM: 0.073 ± 0.048 [G09a]
color index V-I:0.98± 0.12 [B08d]
rotation period RPs: ?

-- (612176) 2000 QL251 --discovery and notes:

Primary discovered 2000 Aug 25 from Cerro Tololo Observatory, La Serena, Chile by M. W. Buie. Permanent number assigned 28 Mar 2022.

Companion discovered 2006 Jul 25 by K. S. Noll, D. C. Stephens, W. M. Grundy, and H. F. Levison using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2006 Sep 12 [N06e].

--Links, more technical:

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--Links to ADS abstracts:


© 2006-2019, 2022 by Wm. Robert Johnston.
Last modified 10 April 2022.
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