what is that. was looking around on sky-map and i noticed it. it doesent seem to be an image artifact, as it passes over image seems.

http://www.sky-map.org/?ra=1.5264433422541681&de=12.694739745359161&zoom=12&show_grid=1&;
amp;show_constellation_lines=0&show_constellation_boundaries=0&show_const_names=0&show_g
alaxies=1&img_source=DSS2

http://server5.sky-map.org/snapshot?ra=1.5264433422541681&de=12.694739745359161&zoom=12&;
show_grid=1&show_constellation_lines=1&show_constellation_boundaries=1&show_const_names=
0&show_galaxies=1&img_source=DSS2