IC 399

IC 399 is an irregular galaxy in the constellation Eridanus about 186 million ly from Earth. It spans roughly 29,000 ly, about 29% of our Milky Way's width. It is receding from us at about 3,991 km/s.

Because its light is 186 million ly from home, you are seeing IC 399 as it looked roughly 186 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).