Object name: NGC5759
Designation(s): NGC5759, UGC09525,
NGC 5759 is a pair of interacting galaxies about 400 million light-years distant in southeastern Bootes. It consists of two galaxies, one stripped of its stars but for the core, the other reduced to a highly distorted spiral. A bridge of stars connects the two. The pair was discovered by Édouard Stephan on June 7, 1880. NED classifies the southern galaxy as S pec. While the NGC Project and Seligman say it is a type I irregular. These are irregular galaxies with some structure but not enough to call a spiral or elliptical. To me, the spiral nature is rather evident. Only Seligman classifies the northern galaxy saying S0/a. A note at NED puzzles me as it reads: "According to [UGC] a pair of galaxies joined by a bridge. The southern one is very compact." To me, it is the northern one I'd call a compact galaxy being mostly a core with a spray of stars. I measure the pair as being about 200,000 light-years across though that assumes both are at the same distance. They likely are at somewhat different distances with it possible there's no actual bridge between them, just two overlapping star streams as seen from our perspective. The lower galaxy has several plumes indicating the interaction may be ongoing with some of the plumes due to other passes of the companion. I wish transparency had been better to see what faint detail I lost to my very hazy skies. I used 70 minutes of luminance, all I could fit in before dawn but still, the image doesn't go very deep.