3C 20

3C 20
3C 20
Observation data (Epoch J2000)
Constellation	Cassiopeia
Right ascension	00h 43m 08.84s
Declination	+52° 03′ 33.8″
Redshift	0.174
Distance	~ 700 Mpc
Type	E
Apparent dimensions (V)	76.8 × 76.8 arcsec² (radiogalaxy)
Apparent magnitude (V)	19
Other designations
	DA 22 , LEDA 2817481 , 3C 20
	See also: Quasar, List of quasars

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[]

^ ^a ^b ^c "NASA/IPAC Extragalactic Database". Results for QSO B1637+826. Retrieved 2006-10-26.
^ www.jb.man.ac.uk/atlas/
^ Simbad
^ 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.

^ Calculated from apparent size and distance: $700Mpc*sin(76.8arcsec)=850,000ly$

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