  This paper reports a new optical observation of 17P/Holmes one orbital period
after the historical outburst event in 2007. We detected not only a common dust
tail near the nucleus, but also a long narrow structure that extended along the
position angle 274.6+/- 0.1 degree beyond the field of view of the Kiso Wide
Field Camera, i.e., >0.2 degree eastward and >2.0 degree westward from the
nuclear position. The width of the structure decreased westward with increasing
distance from the nucleus. We obtained the total cross section of the long
extended structure in the field of view, C= (2.3 +/- 0.5)x10^10 m^2. From the
position angle, morphology and the mass, we concluded that the long narrow
structure consists of materials ejected during the 2007 outburst. On the basis
of the dynamical behavior of dust grains in the solar radiation field, we
estimated that the long narrow structure would be composed of 1 mm-1 cm grains
having an ejection velocity of >50 m/s. The velocity was more than one order of
magnitude faster than that of millimeter - centimeter grains from typical
comets around a heliocentric distance rh of 2.5 AU. We considered that sudden
sublimation of a large amount of water ice (about 10^30 mol/s) would be
responsible for the high ejection velocity. We finally estimated a total mass
of M=(4-8)x10^11 kg and a total kinetic energy of E=(1-6)x10^15 J for the 2007
outburst ejecta, which are consistent with those of previous studies that
conducted soon after the outburst.
