NGC 5147

NGC 5147 is a spiral galaxy in the constellation Virgo about 51 million ly from Earth. It spans roughly 22,000 ly, about 22% of our Milky Way's width. The light reaching us tonight left it about 51 million years ago.

Because its light is 51 million ly from home, you are seeing NGC 5147 as it looked roughly 51 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).