IC 1978

IC 1978

IC 1978 is a spiral galaxy in the constellation Horologium about 491 million ly from Earth. It spans roughly 170,000 ly, about 1.7 times the width of our Milky Way. It is receding from us at about 10,534 km/s.

Illustration from its catalogued shape, not a photograph

Spiral
type · Sab
491 million ly
from Earth · from redshift
173k ly
across
15.7
apparent magnitude
10,534 km/s
receding (RC3)

Because its light is 491 million ly from home, you are seeing IC 1978 as it looked roughly 491 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 1973Galaxy17 million ly
apart
IC 1989Elliptical31 million ly
apart
NGC 1500Elliptical36 million ly
apart
IC 1968Spiral38 million ly
apart
IC 2018Spiral39 million ly
apart
IC 1950Spiral42 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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