  We use high S/N, high-resolution Keck/HIRES spectroscopy of 4 solar twin
candidates (HIP 71813, 76114, 77718, 78399) from our Hipparcos-based CaII H & K
survey to carry out parameter and abundance analyses of these objects. Our
spectroscopic Teff estimates are some 100 K hotter than the photometric scale
of the recent Geneva-Copenhagen survey; several lines of evidence suggest the
photometric temperatures are too cool at solar $T_{\rm eff}$. At the same time,
our abundances for the 3 solar twin candidates included in the
Geneva-Copenhagen survey are in outstanding agreement with the photometric
metallicities; there is no sign of the anomalously low photometric
metallicities derived for some late-G UMa group and Hyades dwarfs. A first
radial velocity determination is made for HIP 78399, and UVW kinematics derived
for all stars. HIP 71813 appears to be a kinematic member of the Wolf 630
moving group (a structure apparently reidentified in a recent analysis of
late-type Hipparcos stars), but its metallicity is 0.1 dex higher than the most
recent estimate of this group's metallicity. While certainly ``solar-type''
stars, HIP 76114 and 77718 are a few percent less massive, significantly older,
and metal-poor compared to the Sun; they are neither good solar twin candidates
nor solar analogs providing a look at the Sun at some other point in its
evolution. HIP 71813 appears to be an excellent solar analog of age 8 Gyr. Our
results for HIP 78399 suggest the promise of this star as a solar twin may be
equivalent to the ``closest ever solar twin'' HR 6060; follow up study of this
star is encouraged.
