IC 4998

IC 4998

IC 4998 is a barred spiral galaxy in the constellation Sagittarius about 311 million ly from Earth. It spans roughly 140,000 ly, about the width of our Milky Way. It is receding from us at about 6,656 km/s.

Illustration from its catalogued shape, not a photograph

Barred spiral
type · SBc
311 million ly
from Earth · from redshift
142k ly
across
14.0
apparent magnitude
6,656 km/s
receding (RC3)

Because its light is 311 million ly from home, you are seeing IC 4998 as it looked roughly 311 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 6919Spiral34 million ly
apart
NGC 6849Elliptical35 million ly
apart
IC 4931Elliptical37 million ly
apart
IC 4991Lenticular48 million ly
apart
NGC 6878Spiral51 million ly
apart
NGC 6845BBarred spiral52 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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