IC 721

IC 721

IC 721 is a barred spiral galaxy in the constellation Crater about 314 million ly from Earth. It spans roughly 150,000 ly, about the width of our Milky Way. The light reaching us tonight left it about 314 million years ago.

Illustration from its catalogued shape, not a photograph

Barred spiral
type · SBc
314 million ly
from Earth · from redshift
149k ly
across
15.2
apparent magnitude

Because its light is 314 million ly from home, you are seeing IC 721 as it looked roughly 314 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.

Nearest galaxies
IC 733Galaxy5.4 million ly
apart
NGC 3775Lenticular14 million ly
apart
NGC 3702Spiral17 million ly
apart
NGC 3722Elliptical17 million ly
apart
IC 2910Lenticular20 million ly
apart
NGC 3688Barred spiral20 million ly
apart
Worlds in the same direction on the sky

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).

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