Deep space
Messier 103
Open cluster · M103 · NGC 581
Open cluster in Cassiopeia
Photo: Wikimedia Commons · Public domain · Wikimedia Commons
Messier 103 is a small open cluster of many faint stars in Cassiopeia. It was discovered on 27 March 1781 by Pierre Méchain, but later added as Charles Messier's last deep-sky object in his catalogue.
Description from Wikipedia (CC BY-SA 4.0).
In your sky
Share your location to see where this is in your sky right now.
Key facts
Distance
~10,000 light-years
Apparent mag.
+7.4
Apparent size
6′
Best seen with
Binoculars
Catalogue
M103 · NGC 581
Did you know
- Listed as Messier 103 in the Messier catalogue, also known as NGC 581.
- Found in the constellation Cassiopeia.
- Within reach of ordinary binoculars under dark skies.
