| Basic information | |
| Right Ascension (2000) | 16 41 41.44 |
| Declination (2000) | +36 27 36.9 |
| Distance [kps] | 7.695 |
The total number of the variable stars in M13 observed in Białków: 12
The photometry and the data shown in table below concern variable stars in clauster M13 derived from paper: G. Kopacki, Z.Kołaczkowski and A.Pigulski, A&A, 2003, 398, 541.
| Star | Period [d] |
ΔV [mag] |
V [mag] |
V-IC [mag] |
Type of variability |
| v1 |
1.459033 | 1.041 | 14.138 | --- | BL Her |
| v2 |
5.110818 | 0.870 | 13.054 | --- | BL Her |
| v5 |
0.38180 | 0.425 | 14.777 | --- | RR Lyr |
| v6 |
2.112918 | 0.600 | 14.095 | --- | BL Her |
| v7 |
0.31269 | 0.305 | 14.930 | --- | RR Lyr |
| v8 |
0.750316 | 0.836 | 14.880 | --- | RR Lyr |
| v9 |
0.39278 | 0.434 | 14.829 | --- | RR Lyr |
| v31 |
0.31930 | 0.113 | 14.433 | --- | RR Lyr |
| v34 |
0.38933 | 0.320 | 14.834 | --- | RR Lyr |
| v36 |
0.31584 0.30441 0.33497 |
0.056 | 14.810 | --- | RR Lyr |
| v35 |
0.32003 | 0.25 | --- | --- | RR Lyr |
| v25 |
0.42956 | 0.44 | --- | --- | RR Lyr |