NGC 4583

NGC 4583 is a lenticular galaxy in the constellation Canes Venatici about 322 million ly from Earth. It spans roughly 140,000 ly, about the width of our Milky Way. The light reaching us tonight left it about 322 million years ago.

Because its light is 322 million ly from home, you are seeing NGC 4583 as it looked roughly 322 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).