NGC 7817

NGC 7817

NGC 7817 is a barred spiral galaxy in the constellation Pegasus about 108 million ly from Earth. It spans roughly 100,000 ly, about the width of our Milky Way. It is receding from us at about 2,157 km/s.

Illustration from its catalogued shape, not a photograph

Barred spiral
type · Sbc
108 million ly
from Earth · from redshift
103k ly
across
12.1
apparent magnitude
2,157 km/s
receding (RC3)

Because its light is 108 million ly from home, you are seeing NGC 7817 as it looked roughly 108 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
NGC 7798Barred spiral7.3 million ly
apart
NGC 7468Elliptical29 million ly
apart
NGC 7465Lenticular29 million ly
apart
IC 1596Spiral29 million ly
apart
NGC 7448Spiral29 million ly
apart
NGC 7800Irregular30 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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