IC 4039

IC 4039 is a barred spiral galaxy in the constellation Coma Berenices about 312 million ly from Earth. It spans roughly 45,000 ly, about 45% of our Milky Way's width. The light reaching us tonight left it about 312 million years ago.

Because its light is 312 million ly from home, you are seeing IC 4039 as it looked roughly 312 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).