Table 2
V, R, I comparison stars in the fields of our sample.
| Source | Star | Coordinates | V | σ(V) | R | σ(R) | I | σ(I) | References | |
| RA Dec | ||||||||||
| [h:m:s] [d:m:s] | ||||||||||
|
|
||||||||||
| PKS 0537-441 | A (Opt Ref) | 05:39:04.51 − 44:06:38.2 | 10.680 | 0.010 | 10.400 | 0.010 | 10.120 | 0.010 | 1 | |
| B | 05:38:49.33 − 44:01:30.0 | 13.200 | 0.010 | 12.870 | 0.010 | 12.540 | 0.010 | 1 | ||
| C | 05:38:59.97 − 44:01:19.1 | 14.080 | 0.010 | 13.710 | 0.010 | 13.340 | 0.010 | 1 | ||
| E (NIR Ref ) | 05:38:55.70 − 44:06:19.6 | 14.843 | 0.035 | 14.151 | 0.034 | 13.585 | 0.023 | 6 | ||
|
|
||||||||||
| PKS 0735+17 | C1 | 07:38:00.57 + 17:41:19.7 | 13.26 | 0.04 | 12.89 | 0.04 | 12.57 | 0.04 | 2 | |
| C2 (Ref) | 07:38:08.55 + 17:40:29.2 | 13.31 | 0.04 | 12.79 | 0.04 | 12.32 | 0.04 | 2 | ||
|
|
||||||||||
| OJ 287 | O (NIR Ref) | 08:54:53.38 + 20:04:44.8 | 14.192 | 0.003 | 13.707 | 0.002 | 13.262 | 0.004 | 3 | |
| B (Opt Ref) | 08:54:54.45 + 20:06:13.6 | 14.627 | 0.003 | 14.315 | 0.003 | 13.999 | 0.004 | 3 | ||
| E | 08:54:55.20 + 20:05:42.3 | 14.974 | 0.003 | 14.632 | 0.003 | 14.304 | 0.004 | 3 | ||
|
|
||||||||||
| PKS 1510-089 | A (Ref) | 15:12:46.16 − 09:05:23.0 | 11.571 | 0.001 | 11.195 | 0.002 | 10.847 | 0.001 | 3 | |
| B | 15:12:53.19 − 09:03:42.4 | 13.282 | 0.016 | 12.992 | 0.022 | 12.687 | 0.019 | 3 | ||
|
|
||||||||||
| PKS 2005-489 | T (Ref) | 20:09:40:03 − 48:50:21.8 | 14.92 | − | 14.39 | – | 13.86 | 0.06 | 4 (V, R band); 6 (I band) | |
| L | 20:09:19.04 − 48:46:43.1 | 14.41 | – | 13.89 | – | 13.45 | 0.09 | 4 (V, R band); 6 (I band) | ||
| 2 | 20:09:05.42 − 48:47:20.8 | 11.92 | 0.03 | 11.33 | 0.03 | 10.79 | 0.03 | 6 | ||
|
|
||||||||||
| PKS 2155-304 | A (Ref) | 21:59:02.49 − 30:10:46.6 | 12.050 | 0.010 | 11.670 | 0.010 | 11.300 | 0.020 | 1 | |
| B | 21:59:05.34 − 30:10:51.0 | 13.000 | 0.010 | 12.470 | 0.020 | 12.020 | 0.020 | 1 | ||
| C | 21:58:42.33 − 30:10:27.4 | 14.280 | 0.010 | 13.920 | 0.020 | 13.560 | 0.020 | 1 | ||
|
|
||||||||||
| W Comae | A (Ref) | 12:21:33.66 + 28:13:04.1 | 12.08 | 0.02 | 11.72 | 0.04 | 11.40 | 0.04 | 5 | |
| B | 12:21:13.83 + 28:13:04.3 | 13.03 | 0.07 | 12.69 | 0.05 | 12.37 | 0.05 | 6 | ||
| C | 12:21:28.61 + 28:16:37.7 | 14.81 | 0.04 | 13.86 | 0.04 | 12.68 | 0.04 | 5 | ||
Notes.Stars used as references are marked with Ref; NIR Ref and Opt Ref specify that the reference stars change between NIR and optical bands. The check star can change depending on its positions in the frames.
Reference. (1) Hamuy & Maza (1989); (2) Ciprini et al. (2007); (3) González-Pérez et al. (2001); (4) Rector & Perlman (2003); (5) Fiorucci & Tosti (1996); (6) this work.
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