Observer's guide
About NGC 7331
NGC 7331 (C30) is catalogued as a galaxy in Pegasus. Its J2000 position is RA 22:37:04, Dec +34:24:56, corresponding to 339.2669 degrees RA and 34.4158 degrees Dec. The local catalogue places it about 47,000,000 light-years away. Its referenced angular extent is approximately 10.47 by 4.17 arcminutes.
Observing tips
This is rated as a hard target at magnitude 9.5. It is associated with autumn observing, with midnight placement typically strongest around August. From 52 degrees north its theoretical meridian altitude is about 72.4 degrees; local horizons and the live altitude chart determine the practical window.
Because it is faint, use a larger aperture where possible, avoid bright Moon conditions, and use averted vision.
What to expect
The SIMBAD classification for the matched source is LIN. SIMBAD records the morphology as SAb. A published radial velocity value is 832 km/s. The SIMBAD record currently connects it to 1286 bibliographic references.
At roughly 10.5 arcminutes across, it benefits from a narrower field and adequate image scale. Use the listed 10.47 by 4.17 arcminute extent to check framing, and treat catalogue magnitude as integrated brightness rather than a direct measure of visual contrast.