Asteroids with Satellites Database--Johnston's Archive

(471165) 2010 HE79

compiled by Wm. Robert Johnston
last updated 1 February 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

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 39.2301 AU
orbital period P: 245.714 yr
(= 89748.6 d)
eccentricity e: 0.180727
perihelion distance q: 32.14018 AU
aphelion distance Q: 46.32 AU
inclination i: 15.674366°
argument of perihelion ω: 284.2439°
ascending node Ω: 238.680612°
mean anomaly M: 63.6393°
perihelion passage TP: 1975 Nov 18.6
Epoch: 2019 Apr 27
data arc: 1992-2019 (181 obs.)
Earth MOID: 31.1844 AU
Jupiter Tisserand invariant TJ: 5.333
Neptune Tisserand invariant TN:2.92974961953606 [*D]

orbital data, secondary:
semimajor axis as: 9300 km (separation) [P20a]
separation/primary radius as/rp:48 [*E]
separation/Hill radius as/rH:0.011 [*E]
orbital period Ps: 44 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 5.1 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 423 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: 850000 km [*E]

other data, primary:
diameter dp: 391 km [*E]
rotation period RPp: 19.49 h [JPL]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 160 km [*E]
diameter ratio ds/dp: 0.41 [P20a]
component mag. difference ΔM: 2 [P20a]
rotation period RPs: ?

-- (471165) 2010 HE79 --discovery and notes:

Primary discovered 2010 Apr 21 from Las Campanas Observatory, Chile by S. S. Sheppard, R. Poleski, A. Edalski, C. A. Trujillo. Permanent number assigned 2016 Aug 18.

Companion discovered 2016 Jun 09 by R. E. Pike, J. Kanwar, M. Alexandersen, Y.-T. Chen, and M. E. Schwamb using adaptive optics telescope observations from Subaru Telescope, Mauna Kea, Hawaii, USA. Announced 2020 Jan 28 [P20a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2020 by Wm. Robert Johnston.
Last modified 1 February 2020.
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