IC 643
IC 643
IC 643 is a lenticular galaxy in the constellation Leo about 326 million ly from Earth. It spans roughly 130,000 ly, about the width of our Milky Way. The light reaching us tonight left it about 326 million years ago.
Illustration from its catalogued shape, not a photograph
Lenticular
type · S0-a
326 million ly
from Earth · from redshift
127k ly
across
15.1
apparent magnitude
Because its light is 326 million ly from home, you are seeing IC 643 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 3399Elliptical24 million ly
apartNGC 3438Elliptical26 million ly
apartNGC 3425Lenticular27 million ly
apartIC 635Barred spiral29 million ly
apartNGC 3417Barred spiral31 million ly
apartNGC 3436Spiral32 million ly
apart
Worlds in the same direction on the sky→apartNGC 3438Elliptical26 million ly
apartNGC 3425Lenticular27 million ly
apartIC 635Barred spiral29 million ly
apartNGC 3417Barred spiral31 million ly
apartNGC 3436Spiral32 million ly
apart
Source: structural data (position, morphology, brightness, redshift) from OpenNGC (CC BY-SA). Distance computed by gravityfinder from redshift via Hubble's law (H0 = 70 km/s/Mpc).