The First VERA Astrometry Catalog
  We present the first astrometry catalog from the Japanese VLBI (very long
baseline interferometer) project VERA (VLBI Exploration of Radio Astrometry).
We have compiled all the astrometry results from VERA, providing accurate
trigonometric annual parallax and proper motion measurements. In total, 99
maser sources are listed in the VERA catalog. Among them, 21 maser sources are
newly reported while the rest of 78 sources are referred to previously
published results or those in preparation for forthcoming papers. The accuracy
in the VERA astrometry are revisited and compared with those from the other
VLBI astrometry projects such as BeSSeL (The Bar and Spiral Structure Legacy)
Survey and GOBELINS (the Gould's Belt Distances Survey) with the VLBA (Very
Long Baseline Array). We have confirmed that most of the astrometry results are
consistent with each other, and the largest error sources are due to source
structure of the maser features and their rapid variation, along with the
systematic calibration errors and different analysis methods. Combined with the
BeSSeL results, we estimate the up-to-date fundamental Galactic parameter of
$R_{0}=7.92\pm0.16_{\rm{stat.}}\pm0.3_{\rm{sys.}}$~kpc and
$\Omega_{\odot}=30.17\pm0.27_{\rm{stat.}}\pm0.3_{\rm{sys.}}$~km~s$^{-1}$~kpc$^{-1}$,
where $R_{0}$ and $\Omega_{\odot}$ are the distance from the Sun to the
Galactic center and the Sun's angular velocity of the Galactic circular
rotation, respectively.
