QSO 0957+561 Twin Quasar, 29-May-2014 |
| Scope: | Orion 200mm Astrograph, f/4 |
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| Mount: | HEQ5 |
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| Guiding: | KWIQ/QHY5 / PHD |
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| Imaging Camera: | Atik 383L+ |
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| Frames: | 5m0s frames, 2 Lum only |
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| Total Exposure: | 10m |
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| Processing: | PixInsight |
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| Distance: | 7.8 Gly |
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| Astrobin link |
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| This is a single quasar that produces a double image due to gravitational lensing by an intervening galaxy 3.7 Gly distant. It was the first case of gravitational lensing to be discovered, in 1979. |
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| In the main image, the quasar is halfway between the centre of the image and the bottom-left corner. The galaxy in the picture is NGC 3079, which is only 50 Mly away. |
