NGC 5145

NGC 5145 is a lenticular galaxy in the constellation Canes Venatici about 57 million ly from Earth. It spans roughly 33,000 ly, about 33% of our Milky Way's width. The light reaching us tonight left it about 57 million years ago.

Because its light is 57 million ly from home, you are seeing NGC 5145 as it looked roughly 57 million years ago. The photons left before that much of history had passed, and are only now reaching us. This distance is estimated from the galaxy's redshift, so the lookback time is approximate.

Source: structural data (position, morphology, brightness, redshift) from OpenNGC (CC BY-SA). Recession velocity from RC3 (de Vaucouleurs et al. 1991, via NASA/HEASARC, public domain). Distance computed by gravityfinder from redshift via Hubble's law (H0 = 70 km/s/Mpc).