Datatype: UBVCCD
The UBV system has been reproduced by CCD cameras and filters,
although the U quantum efficiency of many CCD chips is rather low.
Therefore, the U filter is often not observed and the B and V filters are
combined with the R and I filters.
Record structure
| No | : | Star number |
|---|
| Ref | : | Data source |
|---|
| V | : | V magnitude |
|---|
| B-V | : | B-V colour index |
|---|
| U-B | : | U-B colour index |
|---|
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Jean-Claude.Mermilliod@obs.unige.ch
Last Update: 15 February 1998