  We derive distance priors from Planck first data release, and examine their
impact on dark energy constraints from current observational data. We give the
mean values and covariance matrix of {R, l_a, \Omega_b h^2, n_s}, which give an
efficient summary of Planck data. The CMB shift parameters are R=\sqrt{\Omega_m
H_0^2}\,r(z_*), and l_a=\pi r(z_*)/r_s(z_*), where z_* is the redshift at the
last scattering surface, and r(z_*) and r_s(z_*) denote our comoving distance
to z_* and sound horizon at z_* respectively.
  We find that Planck distance priors are significantly tighter than those from
WMAP9. However, adding Planck distance priors does not lead to significantly
improved dark energy constraints using current data, compared to adding WMAP9
distance priors. This is because Planck data appear to favor a higher matter
density and lower Hubble constant, in tension with most of the other current
cosmological data sets. Adding Planck distance priors to current data leads to
a marginal inconsistency with a cosmological constant in a flat universe.
