IC 1781

IC 1781

IC 1781 is a barred spiral galaxy in the constellation Cetus about 607 million ly from Earth. It spans roughly 120,000 ly, about the width of our Milky Way. It is receding from us at about 13,035 km/s.

Illustration from its catalogued shape, not a photograph

Barred spiral
type · Sbc
607 million ly
from Earth · from redshift
120k ly
across
15.9
apparent magnitude
13,035 km/s
receding (RC3)

Because its light is 607 million ly from home, you are seeing IC 1781 as it looked roughly 607 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 185Spiral22 million ly
apart
IC 186ALenticular22 million ly
apart
IC 177Barred spiral36 million ly
apart
NGC 758Lenticular40 million ly
apart
IC 173Barred spiral54 million ly
apart
NGC 880Spiral55 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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