Asteroids with Satellites Database--Johnston's Archive

(469610) 2004 HF79

compiled by Wm. Robert Johnston
last updated 17 August 2019

--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: 43.6229 AU
orbital period P: 288.12 yr
(= 105237.6 d)
eccentricity e: 0.035037
perihelion distance q: 42.09451 AU
aphelion distance Q: 45.1514 AU
inclination i: 1.4849°
argument of perihelion ω: 192.085°
ascending node Ω: 76.6478°
mean anomaly M: 339.632°
perihelion passage TP: 2035 Aug 15.0
Epoch: 2019 Apr 27
data arc: 2004-2015 (48 obs.)
Earth MOID: 41.078 AU
Jupiter Tisserand invariant TJ: 5.905

orbital data, secondary:
semimajor axis as: 3820 ± 50 km (separation) [G19c]
separation/primary radius as/rp:41 [*E]
separation/Hill radius as/rH:0.006 [*E]
orbital period Ps: 29 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 6.3 [MPC]
6.6 ± 0.5 [G19c]
slope parameter G: (0.15) [*A]
effective diameter dE: 242 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: 630000 km [*E]

other data, primary:
diameter dp: 188 km [*E]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 153 km [*E]
diameter ratio ds/dp: 0.81 [*D]
component mag. difference ΔM: 0.45 [G19c]
rotation period RPs: ?

-- (469610) 2004 HF79 --discovery and notes:

Primary discovered 2004 Apr 24 from Mauna Kea Observatory, Hawaii, USA by B. Gladman. Permanent number assigned 2016 Aug 18.

Companion discovered 2019 Jun 07 using Hubble Space Telescope observations. Announced 2019 Aug [G19c].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2019 by Wm. Robert Johnston.
Last modified 17 August 2019.
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