3C 20
Observation data (J2000 epoch)
ConstellationCassiopeia
Right ascension00h 43m 08.84s[1]
Declination+52° 03′ 33.8″[1]
Redshift0.174
Distance~ 700 Mpc
Apparent magnitude (V)19[2]
Characteristics
TypeE[1]
Apparent size (V)76.8 × 76.8 arcsec²[3] (radiogalaxy)
Other designations
DA 22, LEDA 2817481, 3C 20

3C 20 is a radio galaxy[4] located in the constellation Cassiopeia. It is one of largest known galaxies with a diameter of 850,000 ly (260 kpc).[a]

References

  1. ^ a b c "NASA/IPAC Extragalactic Database". Results for QSO B1637+826. Retrieved 2006-10-26.
  2. ^ Simbad
  3. ^ www.jb.man.ac.uk/atlas/
  4. ^ Hiltner, P. R.; Meisenheimer, K.; Roeser, H. J.; Laing, R. A.; Perley, R. A. (1994). "Hot SPOT 3C20 west: an optical synchrotron source". Astronomy and Astrophysics. 286: 25–36. Bibcode:1994A&A...286...25H.

Notes

  1. ^ Calculated from apparent size and distance:



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