NGC 4990

Cocoon Galaxy is a lenticular galaxy in the constellation Virgo about 147 million ly from Earth. It spans roughly 39,000 ly, about 39% of our Milky Way's width. It is receding from us at about 3,180 km/s.

Because its light is 147 million ly from home, you are seeing Cocoon Galaxy as it looked roughly 147 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).