Asteroids with Satellites Database--Johnston's Archive

(612239) 2001 QC298

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, Cubewano


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 46.191 AU
orbital period P: 313.935 yr
(= 114664.7 d)
eccentricity e: 0.12164
perihelion distance q: 40.5721 AU
aphelion distance Q: 51.809 AU
inclination i: 30.6240°
argument of perihelion ω: 4.22°
ascending node Ω: 334.78984°
mean anomaly M: 13.46°
perihelion passage TP: 2002 Aug 28
Epoch: 2014 May 23
data arc: 2000-2007 (26 obs.)
Earth MOID: 39.5626 AU
Jupiter Tisserand invariant TJ: 5.202
Neptune Tisserand invariant TN:2.77 [*D]


orbital data, secondary:
semimajor axis as: 3813 ± 15 km [G11a]
separation/primary radius as/rp:32 [*D]
separation/Hill radius as/rH:0.0050 [*D]
orbital period Ps: 19.23 ± 0.001 d [G11a]
eccentricity es: 0.335 ± 0.002 [G11a]
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 6.3 [MPC]
6.26 ± 0.32 [V14a]
slope parameter G: (0.15) [*A]
effective diameter dE: 303 ± 29/32 km [V14a]
geometric albedo: 0.063 ± 0.029/0.018 [V14a]
color index U-B: 0.16 [J07a]
color index B-V: 0.66 [S09b]
color index V-R:0.49 ± 0.03 [J07a]
color index B-R:1.03 ± 0.08 [S09b]
color index V-I:1 [S09b]
taxonomic type: ?
mass m: 1.19x1019 ± 1.4x1017 kg [G11a]
density ρ: 1.14 ± 0.34/0.3 g/cm3[V14a]
Hill radius rH: 760000 km [*D]

other data, primary:
diameter dp: 235 ± 21/23 km [V14a]
color index V-I:0.78 ± 0.05 [B08d]
rotation period RPp: 7.78 ± 0.48 h [T14a]
amplitude in mag., rotational ΔM: 0.3 ± 0.04 [T14a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 192 ± 17/19 km [V14a]
diameter ratio ds/dp: 0.817 [G11a]
component mag. difference ΔM: 0.44 [M05b]
color index V-I:0.85± 0.05 [B08d]
rotation period RPs: ?

-- (612239) 2001 QC298 --discovery and notes:

Primary discovered 2001 Aug 21 from Cerro Tololo Observatory, La Serena, Chile by M. W. Buie. Linked to prediscovery observations from 2000 Jul 29. Permanent number assigned 28 Mar 2022.

Companion discovered 2002 Oct 04 using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2002 Dec 17.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2002-2014, 2022 by Wm. Robert Johnston.
Last modified 10 April 2022.
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