The 
system is one of the most important photometric systems. The
first catalogue (Strömgren & Perry 1965) contained uvby
data for 1217 stars.
H
photometry was added by Crawford et al. (1965). Data showing the growth
of this system are presented in Table 1.
Column 1 indicates the year of publication while Cols. 2, 3, and 4 indicate
respectively the number of stars, number of measurements, and number of
publications, the reference to the catalogue successive versions being given in
the last column.
| Number of | ||||
| Year | Stars | Meas. | Pub. | Cat. reference |
| 1965 | 1217 | 1217 | 1 | Strömgren & Perry (1965) |
| 1973 | 7600 | 10500 | 76 | Lindemann & Hauck (1973) |
| 1975 | 9407 | 12900 | 106 | Hauck & Mermilliod (1975) |
| 1980 | 19884 | 31161 | 223 | Hauck & Mermilliod (1980) |
| 1985 | 40848 | 60016 | 336 | Hauck & Mermilliod (1985) |
| 1990 | 44896 | 69190 | 414 | Hauck & Mermilliod (1990) |
| 1997 | 63313 | 105873 | 533 | present catalogue |
|
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