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).[lower-alpha 1]
| 3C 20 | |
|---|---|
| Observation data (Epoch J2000) | |
| Constellation | Cassiopeia |
| Right ascension | 00h 43m 08.84s[1] |
| Declination | +52° 03′ 33.8″[1] |
| Redshift | 0.174 |
| Distance | ~ 700 Mpc |
| Type | E[1] |
| Apparent dimensions (V) | 76.8 × 76.8 arcsec²[2] (radiogalaxy) |
| Apparent magnitude (V) | 19[3] |
| Other designations | |
| DA 22 , LEDA 2817481 , 3C 20 | |
| See also: Quasar, List of quasars | |
References
- "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.
Notes
- Calculated from apparent size and distance:
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