Trumpler 15

Trumpler 15 is an open cluster in the constellation Carina that lies on the outskirts of the Carina Nebula.^[3] Estimated ages of the stars in Trumpler 15 suggest that the cluster is slightly older than its sibling clusters Trumpler 14 and 16.^[4]

Trumpler 15
Observation data (J2000 epoch)
Right ascension	10h 44m 43s[1]
Declination	−59° 22.0′[1]
Distance	8,600 light-years (2,600[2] parsecs)
Apparent magnitude (V)	7.0[1]
Physical characteristics
Other designations	Cr 231, C 1042-591
Associations
Constellation	Carina
See also: Open cluster, List of open clusters

Colour-composite image of the Carina Nebula with Trumpler 15 at the top

It lies also above the Red Supergiant Variable star RT Carinae which is in the south of the Open cluster.