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Table 1
Optical observations of the cluster NGC 1893.
| Date | α (J2000) | δ (J2000) | Instrument | Filter | Exp. time[s] | Seeing | Airmass |
| [h:m:s] | [d:m:s] | ||||||
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| 2007/09/21 | 5:22:27.4 | 33:23:46.0 | DOLORES | V | 10, 60, 2 × 500 | 1.0″ | 1.151–1.192 |
| 2007/09/21 | 5:22:27.5 | 33:23:36.9 | DOLORES | R | 10, 70, 700 | 1.0–1.1″ | 1.066–1.079 |
| 2007/09/21 | 5:22:27.4 | 33:23:42.5 | DOLORES | I | 10, 60, 2 × 740 | 0.9″ | 1.095–1.138 |
| 2007/09/21 | 5:22:27.6 | 33:23:33.0 | DOLORES | Hα | 60, 300, 2 × 700 | 0.9–1.0″ | 1.024–1.049 |
| 2007/10/18 | 5:23:11.6 | 33:23:34.3 | DOLORES | V | 10, 60, 2 × 500 | 0.8″ | 1.026–1.040 |
| 2007/10/18 | 5:23:11.9 | 33:23:37.1 | DOLORES | R | 10, 70, 700 | 0.8–1.0″ | 1.006–1.010 |
| 2007/10/18 | 5:23:11.8 | 33:23:22.0 | DOLORES | I | 10, 60, 2 × 740 | 0.8–1.0″ | 1.009–1.021 |
| 2007/10/18 | 5:23:12.8 | 33:23:47.2 | DOLORES | Hα | 60, 300, 2 × 700 | 0.8″ | 1.013–1.031 |
| 2007/11/14 | 5:23:06.9 | 33:32:29.7 | DOLORES | V | 10, 60, 2 × 500 | 1.0″ | 1.282–1.353 |
| 2007/11/14 | 5:23:06.8 | 33:32:14.6 | DOLORES | R | 10, 70, 700 | 1.0–1.1″ | 1.113–1.134 |
| 2007/11/14 | 5:23:06.7 | 33:32:24.5 | DOLORES | I | 10, 60, 2 × 740 | 0.8–0.9″ | 1.184–1.257 |
| 2007/11/14 | 5:23:06.7 | 33:32:08.2 | DOLORES | Hα | 20, 60, 300, 2 × 700 | 0.8″ | 1.050–1.096 |
| 2007/11/14 | 5:22:28.7 | 33:32:30.5 | DOLORES | V | 10, 60, 2 × 500 | 1.0″ | 1.004–1.007 |
| 2007/11/14 | 5:22:33.9 | 33:32:39.3 | DOLORES | R | 2 × 10, 70, 700 | 0.8–0.9″ | 1.015–1.022 |
| 2007/11/14 | 5:22:32.0 | 33:32:20.5 | DOLORES | I | 10, 60, 2 × 740 | 0.9–1.0″ | 1.004–1.010 |
| 2007/11/14 | 5:22:34.2 | 33:32:47.4 | DOLORES | Hα | 60, 2 × 300, 2 × 700 | 0.8″ | 1.029–1.066 |
| 2007/10/11 | 5:23:22.0 | 33:26:38.7 | CAFOS | V | 15, 3 × 500 | 1.4–1.6″ | 1.002–1.004 |
| 2007/10/11 | 5:23:21.5 | 33:26:37.4 | CAFOS | Hα | 15, 100, 3 × 500 | 1.6–1.8″ | 1.002–1.016 |
| 2008/01/05 | 5:23:23.3 | 33:26:42.4 | CAFOS | V | 10, 60, 2 × 300 | 2.4″ | 1.161–1.205 |
| 2008/01/05 | 5:23:23.2 | 33:26:45.8 | CAFOS | R | 10, 60, 2 × 300 | 2.3–2.6″ | 1.231–1.283 |
| 2008/01/05 | 5:23:23.3 | 33:26:47.3 | CAFOS | I | 10, 60, 3 × 500 | 1.5–1.6″ | 1.353–1.502 |
| 2008/01/05 | 5:23:23.1 | 33:26:38.9 | CAFOS | Hα | 10, 60, 500 | 1.4″ | 1.603–1.651 |
| 2008/01/09 | 5:23:24.2 | 33:26:41.6 | CAFOS | Hα | 15, 100, 3 × 500 | 1.2–1.7″ | 1.139–1.239 |
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