Asteroids with Satellites Database--Johnston's Archive

2004 HD79

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: 46.293 AU
orbital period P: 314.98 yr
(= 115046.5 d)
eccentricity e: 0.02677
perihelion distance q: 45.063 AU
aphelion distance Q: 47.523 AU
inclination i: 1.30474°
argument of perihelion ω: 221.15°
ascending node Ω: 159.016°
mean anomaly M: 227.42°
perihelion passage TP: 2135 Apr 29.6
Epoch: 2019 Apr 27
data arc: 2004-2013 (24 obs.)
Earth MOID: 44.0649 AU
Jupiter Tisserand invariant TJ: 6.074

orbital data, secondary:
semimajor axis as: 2780 ± 80 km (separation) [G19c]
separation/primary radius as/rp:23 [*E]
separation/Hill radius as/rH:0.003 [*E]
orbital period Ps: 12 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 5.7 [MPC]
6.3 ± 0.5 [G19c]
slope parameter G: (0.15) [*A]
effective diameter dE: 319 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: 880000 km [*E]

other data, primary:
diameter dp: 243 km [*E]
rotation period RPp: >8 h [T19b]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 206 km [*E]
diameter ratio ds/dp: 0.85 [*D]
component mag. difference ΔM: 0.36 [G19c]
rotation period RPs: ?

-- 2004 HD79 --discovery and notes:

Primary discovered 2004 Apr 22 from Mauna Kea Observatory, Hawaii, USA by B. Gladman.

Companion discovered 2019 Jun 19 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.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.