3C 20
Observation data (J2000epoch)
Constellation	Cassiopeia
Right ascension	00h 43m 09.18s[1][2]
Declination	+52° 03′ 36.15″[1][2]
Redshift	0.174±0.001[3]
Heliocentric radial velocity	52,164±300 km/s[3]
Galactocentric velocity	52,352±300 km/s[3]
Distance	2,501 ± 175.5 Mly (766.7 ± 53.8 Mpc)h−1 0.6774 (Comoving)[3] 2.213 Gly (678.5 Mpc)h−1 0.6774 (Light-travel)[3]
Apparent magnitude (V)	19.0[3]
Apparent magnitude (B)	19.0[2]
magnitude (J)	16.368±0.112[4]
magnitude (H)	15.582±0.126[4]
magnitude (K)	14.756±0.115[4]
Characteristics
Type	NLRG[3]
Apparent size (V)	76.8″ × 76.8″²[5] (radiogalaxy)
Other designations
DA 22,3C 20,LEDA 2817481

3C 20 is aradio galaxy^[6] located in theconstellationCassiopeia. It features a prominent double hotspot in its eastern lobe. An unusually low fraction of the flux lies within the radio core, which is suggested to be caused by a combination of factors, including jet orientation, synchrotron self-absorption and aging, as well as interactions with surrounding gas and dust.^[7]

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