Observer's guide
About NGC 7078
NGC 7078 (M15) is catalogued as a globular cluster in Pegasus. Its J2000 position is RA 21:29:58.38, Dec +12:10:00.6, corresponding to 322.493 degrees RA and 12.167 degrees Dec. The local catalogue places it about 33,600 light-years away. Its referenced angular extent is approximately 12.3 by 12.3 arcminutes.
Observing tips
StarWatchr rates this as an easy target at magnitude 6.2. It is associated with autumn observing, with midnight placement typically strongest around August. From 52 degrees north its theoretical meridian altitude is about 50.2 degrees; local horizons and the live altitude chart determine the practical window.
A small telescope under reasonably dark skies is a good starting point; use the live altitude chart to choose its highest point.
What to expect
The SIMBAD classification for the matched source is GlC. A published radial velocity value is -106.5 km/s. The SIMBAD record currently connects it to 3291 bibliographic references.
At roughly 12.3 arcminutes across, it benefits from a narrower field and adequate image scale. Use the listed 12.3 by 12.3 arcminute extent to check framing, and treat catalogue magnitude as integrated brightness rather than a direct measure of visual contrast.