NGC 7645

NGC 7645

NGC 7645 is a barred spiral galaxy in the constellation Sculptor about 326 million ly from Earth. It spans roughly 150,000 ly, about the width of our Milky Way. It is receding from us at about 6,869 km/s.

Illustration from its catalogued shape, not a photograph

Barred spiral
type · SBc
326 million ly
from Earth · from redshift
150k ly
across
13.8
apparent magnitude
6,869 km/s
receding (RC3)

Because its light is 326 million ly from home, you are seeing NGC 7645 as it looked roughly 326 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 7636Lenticular5.5 million ly
apart
IC 5326Barred spiral18 million ly
apart
IC 5290Spiral49 million ly
apart
NGC 7498Spiral52 million ly
apart
IC 5349 NED01Lenticular52 million ly
apart
NGC 7812Spiral54 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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