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Contains:  NGC 3079, NGC 3073
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Double Quasar (gravitational lensed) QSO 0957+561 A/B, 


            Kees Scherer
Double Quasar (gravitational lensed) QSO 0957+561 A/B

Double Quasar (gravitational lensed) QSO 0957+561 A/B

Technical card

Resolution: 3072x2317

Dates:Feb. 11, 2019

Frames:Baader Luminance: 131x120" (gain: 1.00) -20C bin 1x1

Integration: 4.4 hours

Darks: ~40

Flats: ~50

Bias: ~256

Avg. Moon age: 6.00 days

Avg. Moon phase: 35.50% job: 2519836

RA center: 150.407 degrees

DEC center: 55.873 degrees

Pixel scale: 1.116 arcsec/pixel

Orientation: 1.131 degrees

Field radius: 0.596 degrees

Locations: Knight Observatory,Quinta Castelo Novo, Serra de Tomar, Portugal

Data source: Backyard


"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. It is a quasar that appears as two images, a result from gravitational lensing caused by the galaxy YGKOW G1 that is located in the line of sight between Earth and the quasar."....."There is a 417 ± 3 day time lag between the two images." (A light reaches Earth 14 months before B light) Source:

I wondered if i could image this close pair with the Esprit 100 (550 mm focal length)/ QHY16200 CCD combo. After test images i decided to use 120 seconds, shoot a lot of subs and use 2 x drizzle in APP. The Arcsinh stretch in pixinsight worked best followed by careful curve adjustment. The inset upper-left is a 500% blow-up.



Kees Scherer
License: Attribution Creative Commons

Sky plot

Sky plot


Double Quasar (gravitational lensed) QSO 0957+561 A/B, 


            Kees Scherer

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