NGC 7331 and Stephan's Quintet (Hickson 92) (rhedden)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: NGC 7315 · NGC 7318 · NGC 7319 · NGC 7320 · NGC 7331 · NGC 7335

NGC 7331 and Stephan's Quintet (Hickson 92), rhedden

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NGC 7331 and Stephan's Quintet (Hickson 92)

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NGC 7331 and Stephan's Quintet (Hickson 92)

NGC 7331 (Caldwell 30) is a well-known spiral galaxy of visual magnitude 9.5 in the costelllation Pegasus. Nearby is the famous Stephan’s Quintet, also known as Hickson 92 or Arp 319. This image is an LRGB composite with luminance taken from home (Bortle 4/5) and RGB data taken from my dark site (Bortle 2) on a really good night that was free from smoke.

Although the angular size of NGC 7331 (10.2’ x 4.2’) is large enough to permit imaging with small telescopes, the larger sensor of the QHY268M and the short focal length of the Esprit 100ED actually provided too much real estate for this field, so this image was cropped down to frame the subjects well.

One interesting detail in the processing of this image was that I used StarNet++ to generate a star mask with the express purpose of reducing the halos around the stars. This image was not reconstructed from a starless image; it's the original data with a halo mask that I created from a starless version. I was very pleased with the resulting reduction in halos without introducing the usual artefacts from Starnet++.

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Astrometry.net job	5026907
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NGC 7331 and Stephan's Quintet (Hickson 92)

NGC 7331 and Stephan's Quintet (Hickson 92)

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NGC 7331 and Stephan's Quintet (Hickson 92)

NGC 7331 and Stephan's Quintet (Hickson 92)

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