Extremes
| Title | Quasar | Data | Notes |
|---|---|---|---|
| Optically brightest on Earth | 3C 273 | Apparent Magnitude ~ 12.9 |
Absolute Magnitude: −26.7 |
| Seemingly optically brightest | APM 08279+5255 | Seeming Absolute Magnitude −32.2 |
This quasar is gravitationally lensed, its actual absolute magnitude is estimated to be −30.5 |
| Optically brightest at source | Absolute Magnitude |
||
| Most powerful quasar radio source | 3C 273 | Also the most powerful radio source in the sky | |
| Most powerful | |||
| Most variable quasar radio source | QSO J1819+3845 (Q1817+387) | Also the most variable extrasolar radio source | |
| Least variable quasar radio source | |||
| Most variable quasar optical source | |||
| Least variable quasar optical source | |||
| Most distant | ULAS J1120+0641 | z=7.085 | |
| Most distant radio-quiet quasar | |||
| Most distant radio-loud quasar | QSO J1427+3312 | z=6.12 | Found June 2008 |
| Most distant blazar quasar | QSO J0906+6930 | z=5.47 | |
| Least distant | 3C273 | z=0.158 |
Read more about this topic: List Of Quasars
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