Observer's guide
About Satellite of M31
Satellite of M31 (M110) is catalogued as an elliptical galaxy in Andromeda. Its J2000 position is RA 00:40:22.08, Dec +41:41:07.1, corresponding to 10.0919 degrees RA and 41.6854 degrees Dec. The local catalogue places it about 2,900,000 light-years away. Its referenced angular extent is approximately 3.33 by 2.1 arcminutes.
Observing tips
This is rated as a hard target at magnitude 8.5. It is associated with autumn observing, with midnight placement typically strongest around September. From 52 degrees north its theoretical meridian altitude is about 79.7 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 GiG. SIMBAD records the morphology as E5pec. A published radial velocity value is -246 km/s. The SIMBAD record currently connects it to 1373 bibliographic references.
At roughly 3.3 arcminutes across, it benefits from a narrower field and adequate image scale. Use the listed 3.33 by 2.1 arcminute extent to check framing, and treat catalogue magnitude as integrated brightness rather than a direct measure of visual contrast.