Asteroids with Satellites Database--Johnston's Archive

2003 HG57

compiled by Wm. Robert Johnston
last updated 20 September 2014

--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: 43.677 AU
orbital period P: 288.657 yr
(= 105432.1 d)
eccentricity e: 0.03179
perihelion distance q: 42.288 AU
aphelion distance Q: 45.065 AU
inclination i: 2.09608°
argument of perihelion ω: 223.16°
ascending node Ω: 36.3070°
mean anomaly M: 316.65°
perihelion passage TP: 2049 Feb 24
Epoch: 2014 May 23
data arc: 2003-2013 (19 obs.)
Earth MOID: 41.2731 AU
Jupiter Tisserand invariant TJ: 5.907
Neptune Tisserand invariant TN:3.10 [*D]

orbital data, secondary:
semimajor axis as: 13200 ± 50 km (separation) [G12b]
separation/primary radius as/rp:170 [*E]
separation/Hill radius as/rH:0.024 [*E]
orbital period Ps: 210 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 6.5 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 221 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: 550000 km [*E]

other data, primary:
diameter dp: 156 km [*E]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 156 km [*E]
diameter ratio ds/dp: 1 [G12b]
component mag. difference ΔM: 0.0 [G12b]
rotation period RPs: ?

-- 2003 HG57 --discovery and notes:

Primary discovered 2003 Apr 26 from Mauna Kea Observatory, Hawaii, USA by ?.

Companion discovered 2010 Dec 22 using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2012.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2012, 2014 by Wm. Robert Johnston.
Last modified 20 September 2014.
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