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Trumpler 3
Trumpler 3 as seen from the Stellarium Software
Observation data (J2000.0 epoch)
Right ascension	03h 12m 00s
Declination	+63° 15′ 00″
Distance	2250 ly (690 pc)
Apparent magnitude (V)	7.0[1]
Physical characteristics
Other designations	Cr 36, Cl Harvard 1, C 0307+630
Associations
Constellation	Cassiopeia
See also: Open cluster, List of open clusters

Trumpler 3 is an open cluster located in the constellation Cassiopeia. It has the visual magnitude of 7 and is one of the most famous star clusters in the Trumpler catalogue.

It has two bright stars, TYC 4053-658-1 and TYC 4053-466-1 of apparent magnitudes 10.16 and 10.02, respectively.^[1]

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