Stephan's quintet (Morten la Cour)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: NGC 7317 · NGC 7318 · NGC 7319 · NGC 7320 · Stephan's Quintet

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Stephan's quintet

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Stephan's quintet

The idea of this image of Stephan’s quintet was to play with the redshift of the Ha emission. The foreground galaxy NGC7320 has a redshift of 786 km/s, whereas the redshift of the background galaxies galaxies NCG7328a+b and NCG7319 is between 5.774 - 6.764 km/s (date from SIMBADWikipedia). By using the Fizeau-Doppler formula (found on Wikipedia under redshift) one finds that the redshift of the 656 nm Ha emission from the foreground galaxy is redshifted by 2 nm, and thus passes unhindered through my 5nm Ha filter. The Ha emission from the background galaxies is redshifted out to around 670 nm, and will thus not pass the Ha filter. However, this redshifted Ha emission will pass through my 672nm SII filter. I therefore decided to map both Ha exposures and SII exposures to the red channel in order to show the Ha emission from both the foreground galaxy AND the shock wave caused by the collision of NGC7318b and NGC7319

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Status	Advanced success
Started	...
Astrometry.net job	6502303
PixInsight job	JIUAY9K0AZ6NBGUWPMT7JJR0S2GXILWV
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	22h36m00s.342
RA (top/left)	22h36m53s.199
RA (top/right)	22h35m08s.707
RA (bottom/right)	22h35m07s.607
RA (bottom/left)	22h36m51s.805

Dec (center)	+33°57′55″.92
Dec (top/left)	+34°05′15″.48
Dec (top/right)	+34°05′37″.68
Dec (bottom/right)	+33°50′33″.94
Dec (bottom/left)	+33°50′11″.48

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Stephan's quintet

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