NGC 7331

These faint tidal effects were independently confirmed in images from different team-members. The detailed zoom-in of “M”, from left to right: H. Strauß (500 mm aperture and 7,5 h exposure), P. Remmel (360 mm aperture with 4 h exposure), M. Blauensteiner (110 mm aperture with enormous 26 h exposure). This information was the hint of gravitational interactioncs with NGC 7331.

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