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Table 1
Equipment of the observations.
| Telescope | Diameter | CCD | Pixel size | Scale | Field of view | Filter | λc | FWHM |
| (m) | (μm× μm) | (′′/pix) | (′×′) | nm | nm | |||
|
|
||||||||
| BTA | 6.0 | 2048 × 2048 | 13.5 × 13.5 | 0.18 (binned 2 × 2) | 6.1 × 6.1 | B, V, Rc | 440, 547, 662 | 97, 79, 150 |
| RC | 2.0 | 562 × 512 | 24 × 24 | 0.99 | 9.2 × 8.4 | B, V, RX | 431, 547, 680 | 100, 90, 111 |
| 2084 × 2084 | 24 × 24 | 0.31 (binned 3 × 3) | 10.8 × 10.8 | B, V, RX | 431, 547, 680 | 100, 90, 111 | ||
| NOT | 2.5 | 2048 × 2048 | 13.5 × 13.5 | 0.19 | 6.5 × 6.5 | B, V, R | 440, 530, 650 | 100, 80, 130 |
| LT | 2.0 | 4096 × 4112 | 15 × 15 | 0.15 (binned 2 × 2) | 10 × 10 | B, V, R | 435, 537, 617 | 100, 90, 130 |
Notes. BTA: 6 m Big Telescope Alt-azimuth (operated by the SAO). RC: 2 m Ritchey-Chretien Telescope (Peak Terskol). NOT: 2.5 m Nordic Optical Telescope (La Palma). LT: 2 m Liverpool Telescope (La Palma).
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