From 1953 on, the UBV photoelectric photometric system has been used to
measure the apparent magnitude and colours of stars in many clusters. It has
produced the best colour-magnitude diagrams. The UBV data stored in the datbase
come both from specific studies and from larger surveys of fields stars. This
is especially true for the brighter stars of each cluster.
The number of measurements has to be completed. 0 simply means that the
information is still absent.
|B-V||:||B-V colour index|
|U-B||:||U-B colour index|
|N||:||Number of measurements|
List of clusters
Query the references
Last Update: 17 February 1998