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Twin Quasar information


The Twin Quasar Q0957+561
The Twin Quasar QSO 0957+561, which lies 8.7 billion light-years from Earth, is seen right in the center of this picture.[1]
Observation data (Epoch J2000)
ConstellationUrsa Major
Right ascension10h 01m 20.99s
Declination+55° 53′ 56.5″
Redshift1.413
Distance8,700,000,000 ly (2,400,000,000 pc)
TypeRad
Apparent dimensions (V)6" distance
Apparent magnitude (V)16.7
Other designations
Twin Quasar, Double Quasar, Twin QSO, QSO 0957+561, Q0957+561, SBS 0957+561, TXS 0957+561, 8C 0958+561, PGC 2518326, A: USNO-A2 1425-7427021 B:USNO-A2 1425-7427023
See also: Quasar, List of quasars

The Twin Quasar (also known as Twin QSO, Double Quasar, SBS 0957+561, TXS 0957+561, Q0957+561 or QSO 0957+561 A/B), was discovered in 1979 and was the first identified gravitationally lensed object,[citation needed] not to be confused with the first detection of light deflection in 1919. It is a quasar that appears as two images, a result from gravitational lensing caused by the galaxy YGKOW G1 that is located directly between Earth and the quasar.

  1. ^ "Seeing double". ESA/Hubble Picture of the Week. Retrieved 20 January 2014.

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