Asteroids with Satellites Database--Johnston's Archive

(2047) Smetana

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: main belt asteroid, Hungaria


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 1.872013158 AU
orbital period P: 2.561365453 yr
(= 935.5387318 d)
eccentricity e: 0.003427671
perihelion distance q: 1.86559651 AU
aphelion distance Q: 1.878429803 AU
inclination i: 25.276498°
argument of perihelion ω: 304.5334°
ascending node Ω: 36.628790°
mean anomaly M: 277.8747°
perihelion passage TP: 2014 Dec 22.420
Epoch: 2014 May 23
data arc: 1971-2013 (748 obs.)
Earth MOID: 0.868774 AU
Jupiter Tisserand invariant TJ: 3.864


orbital data, secondary:
semimajor axis as: 6.3 km [*E]
separation/primary radius as/rp:4.2 [*E]
separation/Hill radius as/rH:0.014 [*E]
orbital period Ps: 0.9346 ± 0.0008 d [W13c]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.9 [MPC]
14.25 ± 0.05 [W13c]
slope parameter G: 0.30 [W13c]
effective diameter dE: 3.07 ± 0.15 km [W13c]
geometric albedo: 0.37 ± 0.04 [W13c]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 440 km [*E]

other data, primary:
diameter dp: 3 ± 0.15 km [*D]
rotation period RPp: 2.4970 ± 0.0003 h [W13c]
amplitude in mag., rotational ΔM: 0.12 ± 0.01 [W13c]
amplitude in mag., mutual events ΔM:0.05 [W13c]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 0.63 ± 0.07 km [*D]
diameter ratio ds/dp: >0.21 ± 0.02 [W13c]
component mag. difference ΔM: <3.4 ± 0.2 [*D]
rotation period RPs: ?

-- (2047) Smetana --discovery and notes:

Primary discovered 1971 Oct 26 from Bergedorf, Germany by L. Kohoutek. Alternate designation(s): 1971 UA1 . Permanent number assigned -.

Named - for Bedrich Smetana (1824-1884) [MPC4786].

Companion discovered 2012 Oct 31 using lightcurve observations. Announced 2012 Mar .

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2013, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
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