NGC 4547

NGC 4547 is an elliptical galaxy in the constellation Ursa Major about 597 million ly from Earth. It spans roughly 210,000 ly, about 2.1 times the width of our Milky Way. The light reaching us tonight left it about 597 million years ago.

Because its light is 597 million ly from home, you are seeing NGC 4547 as it looked roughly 597 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).