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NGC 7331 and Stephan's Quintet | by infinitalavita
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NGC 7331 and Stephan's Quintet

Constellation: Pegasus.

Session: 03 Oct 2019.


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NGC 7331:


NGC 7331 (also known as Caldwell 30) is an unbarred spiral galaxy about 40 million light-years (12 Mpc) away in the constellation Pegasus. It was discovered by William Herschel in 1784. NGC 7331 is the brightest member of the NGC 7331 Group of galaxies. The other members of the group are the lenticular or unbarred spirals NGC 7335 and 7336, the barred spiral galaxy NGC 7337 and the elliptical galaxy NGC 7340. These galaxies lie at distances of approximately 332, 365, 348 and 294 million light years, respectively. In both visible light and infrared photos of the NGC 7331, the core of the galaxy appears to be slightly off-center, with one side of the disk appearing to extend further away from the core than the opposite side.


The galaxy is similar in size and structure to the Milky Way, and is often referred to as "the Milky Way's twin". However, discoveries in the 2000s regarding the structure of the Milky Way may call this similarity into doubt, particularly because the latter is now believed to be a barred spiral, compared to the unbarred status of NGC 7331.


Stephan's Quintet:


Stephan's Quintet is a visual grouping of five galaxies of which four form the first compact galaxy group ever discovered. The group, visible in the constellation Pegasus, was discovered by Édouard Stephan in 1877 at the Marseille Observatory. The group is the most studied of all the compact galaxy groups. The brightest member of the visual grouping is NGC 7320 that is shown to have extensive H II regions, identified as red blobs, where active star formation is occurring.


Source: Wikipedia NGC 7331


Source: Wikipedia Stephan's Quintet:



• Optics: Takahashi FSQ-85EDX super apo (quadruplet 85/450).

• Mount: Skywatcher N-EQ6 Pro.

• Filters: ---.

• Accessories: QHYCCD QHYCFW-2-M motorized filter wheel, Primalucelab Sesto Senso, Primalucelab Eagle 3S.

• Camera: QHY163M mono camera.


Lum: 60x60s | binning 1x1 | Gain 120 | Offset 80 | cooled - 20°c.


Integration: 1 hour.

Correction: Darks, Flats, Bias


Notes: Cropped, light polluttion (bortle 5/6).


Pixinsight, Adobe Photoshop.


© • Cristian Cestaro

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Uploaded on October 4, 2019