Asteroids with Satellites Database--Johnston's Archive

(469509) 2003 HC57

compiled by Wm. Robert Johnston
last updated 9 August 2020

--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: 44.1928 AU
orbital period P: 293.783 yr
(= 107306.5 d)
eccentricity e: 0.071395
perihelion distance q: 41.0377 AU
aphelion distance Q: 47.348 AU
inclination i: 1.03486°
argument of perihelion ω: 44.505°
ascending node Ω: 234.0406°
mean anomaly M: 307.827°
perihelion passage TP: 2062 Dec 28.5
Epoch: 2020 May 31
data arc: 2003-2015 (76 obs.)
Earth MOID: 40.0213 AU
Jupiter Tisserand invariant TJ: 5.931
Neptune Tisserand invariant TN:3.098 [*D]


orbital data, secondary:
semimajor axis as: 1960 ± 70 km (separation) [G20a]
orbital period Ps: ?
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 5.8 [MPC]
6.1 ± 0.5 [G20a]
slope parameter G: (0.15) [*A]
effective diameter dE: 306 km [*E]
geometric albedo: (0.09) [*A]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1 g/cm3) [*A]
Hill radius rH: 740000 km [*E]

other data, primary:
diameter dp: 222 km [*E]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 211 km [*E]
diameter ratio ds/dp: 0.95 [*D]
component mag. difference ΔM: 0.1 [G20a]
rotation period RPs: ?

-- (469509) 2003 HC57 --discovery and notes:

Primary discovered 2003 Apr 26 from Mauna Kea Observatory, Hawaii, USA by ?. Permanent number assigned 2016 Aug 18.

Companion discovered 2020 Jun 02 by Solar System Origins Legacy Survey (A. H. Parker et al.) using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2020 Jul [G20a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2020 by Wm. Robert Johnston.
Last modified 9 August 2020.
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