Asteroids with Satellites Database--Johnston's Archive

(5143) Heracles

compiled by Wm. Robert Johnston
last updated 21 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: NEA, Apollo


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 1.833500481 AU
orbital period P: 2.482731444 yr
(= 906.8176598 d)
eccentricity e: 0.772242011
perihelion distance q: 0.417594382 AU
aphelion distance Q: 3.249406580 AU
inclination i: 9.0355614°
argument of perihelion ω: 227.705989°
ascending node Ω: 309.566920°
mean anomaly M: 337.4331464°
perihelion passage TP: 2014 Jul 18.84450
Epoch: 2014 May 23
data arc: 1953-2014 (1746 obs.)
Earth MOID: 0.0585906 AU
Jupiter Tisserand invariant TJ: 3.583


orbital data, secondary:
binary dynamical type:L [M09a]
semimajor axis as: 4 km (separation) [T12b]
separation/primary radius as/rp:2.2 [*E]
separation/Hill radius as/rH:0.034 [*E]
orbital period Ps: 0.6458 ± 0.0625 d [T12b]
eccentricity es: ?
normalized ang. mom. αL: 0.02 [M09a]

other data, system (combined):
absolute mag. H: 13.8 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 3.65 km [*D]
geometric albedo: 0.4 [*E]
color index U-B: ?
color index B-V: ?
taxonomic type: O (SMASSII) [JPL]
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 120 km [*E]

other data, primary:
diameter dp: 3.6 ± 1.2 km [T12b]
rotation period RPp: 2.706 ± 0.001 h [P12a]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 0.6 ± 0.3 km [T12b]
diameter ratio ds/dp: 0.167 ± 0.1 [*D]
component mag. difference ΔM: 3.9 [*D]
rotation period RPs: ?

-- (5143) Heracles --discovery and notes:

Primary discovered 1991 Nov 07 from Palomar Observatory, California, USA by C. S. Shoemaker. Alternate designation(s): 1991 VL, 1962 PG. Linked to prediscovery observations from 1953 Nov 30. Permanent number assigned 1992 Mar 18.

Named 1992 Jul 14 for the Greek mythological character [MPC20523].

Companion discovered 2011 Dec 10 by P. A. Taylor, M. C. Nolan, and E. S. Howell using radar observations from Arecibo Observatory, Puerto Rico. Announced 2012 Jul 13 [T12b].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2012, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
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