NGC 4821

NGC 4821 is an elliptical galaxy in the constellation Coma Berenices about 328 million ly from Earth. It spans roughly 56,000 ly, about 56% of our Milky Way's width. It is receding from us at about 6,941 km/s.

Because its light is 328 million ly from home, you are seeing NGC 4821 as it looked roughly 328 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).