Asteroids with Satellites Database--Johnston's Archive

1994 XD

compiled by Wm. Robert Johnston
last updated 20 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 (PHA)


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 2.347124733 AU
orbital period P: 3.595940168 yr
(= 1313.4171460 d)
eccentricity e: 0.733373708
perihelion distance q: 0.625805165 AU
aphelion distance Q: 4.068444300 AU
inclination i: 4.312022°
argument of perihelion ω: 249.295287°
ascending node Ω: 96.257008°
mean anomaly M: 160.4340578°
perihelion passage TP: 2012 Oct 14.675438
Epoch: 2014 May 23
data arc: 1994-2013 (294 obs.)
Earth MOID: 0.0200722 AU
Jupiter Tisserand invariant TJ: 3.127


orbital data, secondary:
semimajor axis as: 0.6 ± 0.3 km (separation) [B05a]
separation/primary radius as/rp:2.0 [*E]
separation/Hill radius as/rH:0.020 [*E]
orbital period Ps: 0.749 ± 0.00025 d [W13c]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 19.1 [MPC]
19.11 [JPL]
slope parameter G: (0.15) [*A]
effective diameter dE: 0.62 km [*D]
geometric albedo: 0.1 [*E]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 29 km [*E]

other data, primary:
diameter dp: 0.6 ± 0.15 km [B05a]
rotation period RPp: 2.736 ± 0.001 h [W13c]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: >0.15 km [B05a]
diameter ratio ds/dp: 0.25 [*D]
component mag. difference ΔM: 3.0 [* D]
rotation period RPs: ?

-- 1994 XD --discovery and notes:

Primary discovered 1994 Dec 01 from Steward Observatory, Kitt Peak, Arizona, USA by Spacewatch.

Companion discovered 2005 Jun 24 by L. A. M. Benner, M. C. Nolan, S. J. Ostro, J. D. Giorgini, J. L. Margot, and C. Magri using radar observations from Arecibo Observatory, Puerto Rico. Announced 2005 Jul 11 [B05a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2005-2007, 2014 by Wm. Robert Johnston.
Last modified 20 September 2014.
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