We present Keck Spectroscopy and deep Hubble Space Telescope ACS images of the
interacting galaxy UGC 10214 (also known as VV 29 and Arp 188). UGC 10214 is a
luminous spiral with a long prominent tidal tail, a faint counter tidal plume,
and a polar tidal stream. Briggs et al.\ (2001, A\&A, 380, 418) identified a
small blue gas-rich dwarf galaxy that projects onto UGC 10214 as the galaxy that
is colliding with UGC 10214. The HI gas at the position of the putative blue
dwarf has a radial velocity that is 430 km/s higher than the systemic velocity
of UGC 10214. The Keck spectra show ionized gas at the position of the dwarf
with the same velocity as Briggs et al.'s HI cloud, strengthening their
identification of the dwarf as the intruding galaxy. The observed Balmer
decrement at the position of the dwarf and the colors of the dwarf suggest that
the dwarf is in front of UGC 10214. The tidal tail has a projected length of $\sim
120$ Kpc and an age of at least 100 million years. Consequently, if the dwarf is
in front of UGC 10214, it has survived one or more close encounters with UGC
10214 and is now accelerating toward the large spiral for yet another encounter.
ACS was developed under NASA contract NAS 5-32865, and this research is
supported by NASA grant NAG5-7697. We are grateful for an equipment grant from Sun Microsystems, Inc.
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