  The high-frequency peaked BL Lac object PKS 2005-489 was the target of a
multi-wavelength campaign with simultaneous observations in the TeV gamma-ray
(H.E.S.S.), GeV gamma-ray (Fermi/LAT), X-ray (RXTE, Swift), UV (Swift) and
optical (ATOM, Swift) bands. This campaign was carried out during a high flux
state in the synchrotron regime. The flux in the optical and X-ray bands
reached the level of the historical maxima. The hard GeV spectrum observed with
Fermi/LAT connects well to the very high energy (VHE, E>100GeV) spectrum
measured with H.E.S.S. with a peak energy between ~5 and 500 GeV. Compared to
observations with contemporaneous coverage in the VHE and X-ray bands in 2004,
the X-ray flux was ~50 times higher during the 2009 campaign while the TeV
gamma-ray flux shows marginal variation over the years. The spectral energy
distribution during this multi-wavelength campaign was fit by a one zone
synchrotron self-Compton model with a well determined cutoff in X-rays. The
parameters of a one zone SSC model are inconsistent with variability time
scales. The variability behaviour over years with the large changes in
synchrotron emission and small changes in the inverse Compton emission does not
warrant an interpretation within a one-zone SSC model despite an apparently
satisfying fit to the broadband data in 2009.
