Asteroids with Satellites Database--Johnston's Archive

(2044) Wirt

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: Mars crossing asteroid

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 2.380343808 AU
orbital period P: 3.672550162 yr
(= 1341.3989470 d)
eccentricity e: 0.343768410
perihelion distance q: 1.56205680 AU
aphelion distance Q: 3.198630814 AU
inclination i: 23.974369°
argument of perihelion ω: 50.386700°
ascending node Ω: 53.673166°
mean anomaly M: 91.418104°
perihelion passage TP: 2013 Jun 16.36625
Epoch: 2014 May 23
data arc: 1950-2014 (625 obs.)
Earth MOID: 0.653038 AU
Jupiter Tisserand invariant TJ: 3.347

orbital data, secondary:
binary dynamical type:A [P07f]
semimajor axis as: 12 km [*E]
separation/primary radius as/rp:3.7 [*E]
separation/Hill radius as/rH:0.015 [*E]
orbital period Ps: 0.7904 ± 0.0004 d [P06f]
eccentricity es: ?
normalized ang. mom. αL: 0.79 [P07f]

other data, system (combined):
absolute mag. H: 13 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 6.66 ± 0.6 km [T04c]
geometric albedo: 0.191 ± 0.038 [T04c]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 790 km [*E]

other data, primary:
diameter dp: 6.46 ± 0.58 km [*D]
rotation period RPp: 3.6898 ± 0.0001 h [P06f]
amplitude in mag., rotational ΔM: 0.26 [P06f]
amplitude in mag., mutual events ΔM:0.11 ±0.04 [P06f]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 1.62 ± 0.19 km [*D]
diameter ratio ds/dp: 0.25 ± 0.02 [P06f]
component mag. difference ΔM: 3.0 ± 0.2 [*D]
rotation period RPs: ?

-- (2044) Wirt --discovery and notes:

Primary discovered 1950 Nov 08 from Lick Observatory, Mount Hamilton, California, USA by C. A. Wirtanen. Alternate designation(s): 1950 VE . Permanent number assigned -.

Named 1981 Jan 01 for Carl A. Wirtanen (1910-1990) [MPC5688].

Companion discovered 2005 Dec 08 by D. Pray, P. Pravec, P. Kusnirak, W. Cooney, J. Gross, D. Terrell, A. Galad, S. Gajdos, J. Vilagi, and R. Durkee using lightcurve observations from Carbuncle Hill Observatory, Greene, Rhode Island, USA; Ondrejov Observatory, Czech Republic; Sonoita Research Observatory, Sonoita, Arizona, USA; Modra Observatory, Slovakia; Minneapolis, MN, USA. Announced 2006 Jan 06 [P06f].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2006-2008, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
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