NGC 5151

NGC 5151 is an elliptical galaxy in the constellation Coma Berenices about 384 million ly from Earth. It spans roughly 100,000 ly, about the width of our Milky Way. The light reaching us tonight left it about 384 million years ago.

Because its light is 384 million ly from home, you are seeing NGC 5151 as it looked roughly 384 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).