NGC 7542

NGC 7542 is a lenticular galaxy in the constellation Pegasus about 563 million ly from Earth. It spans roughly 160,000 ly, about 1.6 times the width of our Milky Way. The light reaching us tonight left it about 563 million years ago.

Because its light is 563 million ly from home, you are seeing NGC 7542 as it looked roughly 563 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).