IC 851

IC 851 is a spiral galaxy in the constellation Coma Berenices about 124 million ly from Earth. It spans roughly 41,000 ly, about 41% of our Milky Way's width. The light reaching us tonight left it about 124 million years ago.

Because its light is 124 million ly from home, you are seeing IC 851 as it looked roughly 124 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).