NGC 818

NGC 818

NGC 818 is a barred spiral galaxy in the constellation Andromeda about 198 million ly from Earth. It spans roughly 130,000 ly, about the width of our Milky Way. It is receding from us at about 4,457 km/s.

Illustration from its catalogued shape, not a photograph

Barred spiral
type · Sbc
198 million ly
from Earth · from redshift
127k ly
across
12.5
apparent magnitude
4,457 km/s
receding (RC3)

Because its light is 198 million ly from home, you are seeing NGC 818 as it looked roughly 198 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 179Elliptical7.1 million ly
apart
NGC 845Barred spiral11 million ly
apart
NGC 841Spiral14 million ly
apart
NGC 714Lenticular14 million ly
apart
NGC 912Lenticular17 million ly
apart
NGC 688Barred spiral17 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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