IC 4571

IC 4571

IC 4571 is a barred spiral galaxy in the constellation Triangulum Australe about 229 million ly from Earth. It spans roughly 110,000 ly, about the width of our Milky Way. The light reaching us tonight left it about 229 million years ago.

Illustration from its catalogued shape, not a photograph

Barred spiral
type · SBb
229 million ly
from Earth · from redshift
105k ly
across
13.9
apparent magnitude

Because its light is 229 million ly from home, you are seeing IC 4571 as it looked roughly 229 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 4541Barred spiral18 million ly
apart
NGC 6183Spiral21 million ly
apart
IC 4578Barred spiral31 million ly
apart
IC 4484Spiral36 million ly
apart
IC 4644Barred spiral41 million ly
apart
NGC 6328Spiral45 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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