  In order to investigate the properties of the prominent tidal debris feature
extending to the northeast of the compact group of galaxies Seyfert's Sextet,
we analyzed multi-band (U, B, V, VR, R, I, J, H and K') photometric imaging
data and obtained the following results: 1) The radial surface brightness
distribution of this tidal debris in Seyfert's Sextet (TDSS) in each band
appears to be well approximated by an exponential profile. 2) The observed B-V
color of TDSS is similar to those of dwarf elliptical galaxies in nearby
clusters. 3) Comparing the spectral energy distribution (SED) of TDSS with
theoretical photometric evolution models and with the SED of the stars in the
outer part of HCG 79b, we find that its SED is comparable to that of a $\sim$
10 Gyr-old stellar population with solar metallicity, similar to the stellar
population in the outer part of HCG 79b. This suggests that TDSS consists of
stars that may have been liberated from HCG 79b by strong galaxy interactions,
not a pre-existing dwarf galaxy previously thought.
