Helena Observatory,   North Alton, NS

QSO 0957+561 Twin Quasar

01-Mar-2024 14:04 AST 01-Mar-2024 18:04 UTC

QSO 0957+561 Twin Quasar, 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.