IC 93

IC 93

IC 93 is a barred spiral galaxy in the constellation Cetus about 280 million ly from Earth. It spans roughly 98,000 ly, about the width of our Milky Way. The light reaching us tonight left it about 280 million years ago.

Illustration from its catalogued shape, not a photograph

Barred spiral
type · Sb
280 million ly
from Earth · from redshift
98k ly
across
13.6
apparent magnitude

Because its light is 280 million ly from home, you are seeing IC 93 as it looked roughly 280 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 1670ABarred spiral3.0 million ly
apart
NGC 487Barred spiral5.9 million ly
apart
IC 1670BLenticular6.6 million ly
apart
IC 1623BIrregular14 million ly
apart
NGC 369Barred spiral22 million ly
apart
IC 1622Spiral24 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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