Asteroids with Satellites Database--Johnston's Archive

(76818) Brianenke

compiled by Wm. Robert Johnston
last updated 20 October 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: main belt asteroid, Hungaria


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 1.9297747003 AU
orbital period P: 2.6807722091 yr
(= 979.1705422 d)
eccentricity e: 0.095975689
perihelion distance q: 1.744563245 AU
aphelion distance Q: 2.114896156 AU
inclination i: 18.136534°
argument of perihelion ω: 129.701396°
ascending node Ω: 292.314349°
mean anomaly M: 320.302461°
perihelion passage TP: 2019 Aug 12.974057
Epoch: 2019 Apr 27
data arc: 1980-2018 (1150 obs.)
Earth MOID: 0.794718 AU
Jupiter Tisserand invariant TJ: 3.848


orbital data, secondary:
binary dynamical type:A [P07f]
semimajor axis as: 5.6 km [*E]
separation/primary radius as/rp:3.1 [*E]
separation/Hill radius as/rH:0.011 [*E]
orbital period Ps: 0.5885 ± 0.00004 d [W09a]
eccentricity es: <0.13 [P16d]
normalized ang. mom. αL: 0.96 [P07f]

other data, system (combined):
absolute mag. H: 13.7 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 3.84 km [*D]
geometric albedo: 0.43 [*E]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 500 km [*E]

other data, primary:
diameter dp: 3.6 km [P06b]
rotation period RPp: 3.166 ± 0 h [W05c]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 1.33 km [*D]
diameter ratio ds/dp: 0.37 ± 0.03 [W05c]
component mag. difference ΔM: 2.2 ± 0.2 [*D]
rotation period RPs: ?

-- (76818) Brianenke --discovery and notes:

Primary discovered 2000 Sep 08 from Socorro, New Mexico, USA by LINEAR Program. Alternate designation(s): 2000 RG79, 1999 JL6. Linked to prediscovery observations from 1980 Feb 20. Permanent number assigned 2004 Feb 06.

Named 2019 Aug 27 for Eugene G. Fahnestock (1980-) [MPC115894].

Companion discovered 2005 Aug using lightcurve observations. Announced 2005 Aug 30.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2005-2014, 2019 by Wm. Robert Johnston.
Last modified 20 October 2019.
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