  In this study, we use Keck/KCWI spectroscopy to measure the age, metallicity
and recessional velocity of NGC~1052-DF9 (DF9), a dwarf galaxy in the NGC~1052
group. We compare these properties to those of two other galaxies in the group,
NGC~1052-DF2 and NGC~1052-DF4, which have low dark matter content. The three
galaxies are proposed constituents of a trail of galaxies recently hypothesised
to have formed as part of a ``bullet dwarf'' collision. We show that the ages
and total metallicities of the three galaxies are within uncertainties of one
another which may be expected if they share a related formation pathway.
However, the recessional velocity we recover for DF9 (1680 $\pm$ 10 km
s$^{-1}$) is higher than predicted for a linearly projected interpretation of
the ``bullet dwarf'' trail. DF9 is then either not part of the trail or the
correlation of galaxy velocities along the trail is not linear in 2D projection
due to their 3D geometry. After examining other proposed formation pathways for
the galaxies, none provide a wholly satisfactory explanation for all of their
known properties. We conclude further work is required to understand the
formation of this interesting group of galaxies.
