  We present an improved catalog of halo wide binaries, compiled from an
extensive literature search. Most of our binaries stem from the common proper
motion binary catalogs by Allen et al. (2004), and Chanam\'e \& Gould. (2004)
but we have also included binaries from the lists of Ryan (1992) and
Zapatero-Osorio \& Martin (2004). All binaries were carefully checked and their
distances and systemic radial velocities are included, when available. Probable
membership to the halo population was tested by means of reduced proper motion
diagrams for 251 candidate halo binaries. After eliminating obvious disk
binaries we ended up with 211 probable halo binaries, for 150 of which radial
velocities are available. We compute galactic orbits for these 150 binaries and
calculate the time they spend within the galactic disk. Considering the full
sample of 251 candidate halo binaries as well as several subsamples, we find
that the distribution of angular separations (or expected major semiaxes)
follows a power law $f(a) \sim a^{-1}$ (Oepik's relation) up to different
limits. For the 50 most disk-like binaries, those that spend their entire lives
within $z = \pm 500$~pc, this limit is found to be 19,000 AU (0.09 pc), while
for the 50 most halo-like binaries, those that spend on average only 18\% of
their lives within $z = \pm 500$~pc, the limit is 63,000 AU (0.31 pc). In a
companion paper we employ this catalog to establish limits on the masses of the
halo massive perturbers (MACHOs).
