Table 1
Distribution of observations of NGC 1904 for each filter.
| Date | N V | tV (s) | N I | tI (s) | ||
|
|
||||||
| 20041004 | 7 | 60–200 | 0 | – | ||
| 20041005 | 3 | 100 | 0 | – | ||
| 20090108 | 16 | 150 | 14 | 120 | ||
| 20100123 | 19 | 80–150 | 21 | 40–120 | ||
| 20100221 | 16 | 100–200 | 14 | 50–100 | ||
| 20100307 | 15 | 90–120 | 13 | 45–55 | ||
| 20110312 | 16 | 120–140 | 0 | – | ||
| 20110313 | 10 | 80–150 | 0 | – | ||
| 20111104 | 30 | 90–300 | 32 | 25–120 | ||
| 20120301 | 10 | 150–180 | 10 | 50–65 | ||
| 20120302 | 5 | 100–120 | 5 | 45 | ||
|
|
||||||
| Total: | 147 | 109 | ||||
Notes. Columns NV and NI represent the number of images taken for the filters V and I, respectively. We also provide the exposure time, or range of exposure times, employed during each night for each filter in the columns tV and tI.
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