PKS 2155−304
| PKS 2155−304 | |
|---|---|
Image of PKS 2155−304 obtained in R band at ESO-NTT | |
| Observation data (Epoch J2000) | |
| Constellation | Piscis Austrinus |
| Right ascension | 21h 58m 52.0651817803s |
| Declination | −30° 13′ 32.120657891″ |
| Redshift | 0.116 |
| Distance | 1.5 Gly |
| Type | BL Lac |
| Apparent magnitude (V) | 13.09 |
| Other designations | |
| QSO B2155−304, | |
| See also: Quasar, List of quasars | |
PKS 2155−304 is a BL Lac object, a galaxy hosting a type of blazar. It is a strong emitter from radio to high-energy frequencies.
PKS 2155−304 is at redshift z = 0.116 (Falomo, Pesce & Treves 1993). It is one of the brightest and most studied BL Lacs, one of the first identified through X-ray observations.