NGC 4103
Open Cluster, Crux
NGC 4103 is an open cluster in the constellation Crux. It was discovered by James Dunlop in 1826. It is located approximately 5,000 light years away from Earth, in the Carina-Sagittarius arm.
NGC 4103 is a young open cluster. Its age has been determined to be 30 Myr by Sagar & Cannon (1997), 20 ± 5 Myr by Sanner et al. (2001) and 6 Myr by Piskunov et al. (2004). The metallicity of NGC 4103 is subsolar (−0.47). The tidal radius of the cluster is 12.1 – 15.9 parsecs (39 – 51 light years) and represents the average outer limit of NGC 4103, beyond which a star is unlikely to remain gravitationally bound to the cluster core.
NGC 4103 is a young open cluster. Its age has been determined to be 30 Myr by Sagar & Cannon (1997), 20 ± 5 Myr by Sanner et al. (2001) and 6 Myr by Piskunov et al. (2004). The metallicity of NGC 4103 is subsolar (−0.47). The tidal radius of the cluster is 12.1 – 15.9 parsecs (39 – 51 light years) and represents the average outer limit of NGC 4103, beyond which a star is unlikely to remain gravitationally bound to the cluster core.
Telescope: Planewave CDK17 (FR) f4.5
Mount: Astro Physics 1600GTO
Camera: QHY16200A/ Integral FW
Guider: Agena Starguide II / ZWO ASI178MM
Filters: Astronomik 36mm LRGB
L: 32×5 mins = 240 mins, R: 24×5 mins = 120 mins, G: 24×5 mins = 120 mins, B: 24×5 mins = 120 mins
Total Imaging Time: 8h 40m
Data Imaged remotely on 4 nights during March 2026.
Data acquisition & Processing by David Churchill.
None
