Messier 103

Messier 103 (M103) is a open cluster in the constellation Cassiopeia, with an apparent magnitude of 7.4. It is about 8,500 light-years away.

Finder chart for Messier 103 in the constellation Cassiopeia
Messier 103 (circled) in Cassiopeia. Pink symbols mark Messier objects.
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Facts

CatalogMessier 103 (M103)
Typeopen cluster
ConstellationCassiopeia
Apparent magnitude7.4
Distanceabout 8,500 light-years
Right ascension1 h 33.4 min
Declination+60.65°
Best monthNovember (at about 9 pm)

Sources: star positions, magnitudes and colors from the Yale Bright Star Catalogue; constellation boundaries and star names from the IAU; areas and distances from Wikidata; stick figures by M. van der Sluys. How the maps are made.

How to find M103

M103 is in Cassiopeia. From 40° N it is highest in the north in November evenings, about 69° up. From 35° S it stays below the horizon. Binoculars show it under a dark sky; a small telescope shows more detail.

Cassiopeia constellation →

Other Messier objects in Cassiopeia

Messier 52 (M52)

The Messier catalog →

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