Asteroids with Satellites Database--Johnston's Archive

(469509) 2003 HC57

compiled by Wm. Robert Johnston
last updated 9 October 2021

--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: 44.0336 AU
orbital period P: 292.203 yr
(= 106727.1 d)
eccentricity e: 0.069749
perihelion distance q: 40.96229 AU
aphelion distance Q: 47.1049 AU
inclination i: 1.037789°
argument of perihelion ω: 47.042°
ascending node Ω: 233.9975°
mean anomaly M: 306.698°
perihelion passage TP: 2064 Oct 05.1
Epoch: 2021 Jul 01
data arc: 2003-2021 (284 obs.)
Earth MOID: 39.9457 AU
Jupiter Tisserand invariant TJ: 5.921
Neptune Tisserand invariant TN:3.09683770469186 [*D]

orbital data, secondary:
semimajor axis as: 1960 ± 70 km (separation) [G20a]
separation/primary radius as/rp:19 [*E]
separation/Hill radius as/rH:0.0029 [*E]
orbital period Ps: 8.4 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 5.96 [MPC]
6.1 ± 0.5 [G20a]
slope parameter G: (0.15) [*A]
effective diameter dE: 283 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: 690000 km [*E]

other data, primary:
diameter dp: 205 km [*E]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 195 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 A. H. Parker, et al., and the Solar System Origins Legacy Survey using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2020 Jul [G20a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2020, 2021 by Wm. Robert Johnston.
Last modified 9 October 2021.
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