Trumpler 10

Trumpler 10 (also known as C 0846-423) is an open cluster located in the constellation Vela. It was possibly discovered by Nicolas Louis de Lacaille in 1751-52, as the cluster's location data matches well with No. II.6 in his catalog. The cluster was also officially discovered by James Dunlop in 1826 and rediscovered independently by R.J. Trumpler in 1903.^[3]

Trumpler 10
Observation data (J2000 epoch)
Right ascension	08h 47m 54s[1][2]
Declination	−42° 29′ 27″[1]
Distance	1,100 ly (337.25 pc)
Apparent magnitude (V)	4.6
Physical characteristics
Estimated age	38-47 million years[citation needed]
Other designations	Trumpler 10, Cr 203, C 0846-423, Dunlop 490
Associations
Constellation	Vela
See also: Open cluster, List of open clusters

Open star cluster Trumpler 10 and its surroundings

A photometric investigation was performed in 1962 which studied 29 stars within the cluster and determined 19 additional possible members. In the study, a minimum age of 3×10⁷ (30 million) years and a distance of 420 parsecs were derived.^[4]