NGC3628 and the Leo Triplet

NGC 3628, shown on the right, is an unbarred spiral galaxy about 35 million light-years away in the constellation Leo. It was discovered by William Herschel in 1784. It has a tidal tail approximately 300,000 light-years long. Along with M65 (lower left) and M66 (upper left), NGC 3628 forms the Leo Triplet, a small group of galaxies. Its most conspicuous feature is the broad, obscuring band of dust along the outer edge of its spiral arms, effectively transecting the galaxy as seen from Earth.
This phenomenon causes the view which gave this galaxy a Hamburger Galaxy nickname.
The mentioned companions are M65, which shines at a magnitude of +10.3 and has a diameter of about 95000 light-years. M65 was also the site of a recent supernova. Supernova 2013am was observed on 21 March 2013 by M Sugano from Kakogawa, Japan, who reported a bright ‘new star’ with a magnitude of +15.6.
The third member of the triplet is M66. It is a barred spiral galaxy and the brightest of the Leo Triplet, lying 35 million light-years away.
M66 is slightly asymmetrical, and this is a result of the gravitational tug-of-war playing out between the 3 galaxies.