Hall's Harbour Observatory,   Hall's Harbour, NS

QSO 0957+561 Twin Quasar, 29-May-2014

17-Dec-2018, 03:16 AST 17-Dec-2018, 07:16 UTC

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QSO 0957+561 Twin Quasar

Image Date: 29-May-2014
Scope: Orion 200mm Astrograph, f/4
Mount: HEQ5
Guiding: KWIQ/QHY5 / PHD
Imaging Camera: Atik 383L+
Frames: 5m0s frames, 2 Lum only
Total Exposure: 10m
Processing: PixInsight
Distance: 7.8 Gly
Astrobin link

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.

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.