IC 1542

IC 1542 is a galaxy in the constellation Andromeda about 346 million ly from Earth. It spans roughly 53,000 ly, about 53% of our Milky Way's width. The light reaching us tonight left it about 346 million years ago.

Because its light is 346 million ly from home, you are seeing IC 1542 as it looked roughly 346 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). Recession velocity from RC3 (de Vaucouleurs et al. 1991, via NASA/HEASARC, public domain). Distance computed by gravityfinder from redshift via Hubble's law (H0 = 70 km/s/Mpc).