NGC 4817

NGC 4817 is an elliptical galaxy in the constellation Coma Berenices about 309 million ly from Earth. It spans roughly 62,000 ly, about 62% of our Milky Way's width. The light reaching us tonight left it about 309 million years ago.

Because its light is 309 million ly from home, you are seeing NGC 4817 as it looked roughly 309 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). Distance computed by gravityfinder from redshift via Hubble's law (H0 = 70 km/s/Mpc).