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This is the list of the blazars regularly monitored by the GASP Project of the WEBT.

To reduce offsets between different datasets when building light curves, the source magnitude must be calibrated with respect to the recommended reference stars, as indicated in the corresponding “Photometric Sequence” page.

For the sources with important contributions from the host galaxy, a specific value for the photometry aperture radius is also recommended, in order to optimize the subtraction of the galaxy light contamination.

IAU Name

Object Name

RA (J2000.0)
[h m s]
DEC (J2000.0)
[d m s]
Redshift z

Photometric

Sequence

NED Link
0219+428 3C 66A 02 22 39.6 +43 02 08 0.444
0235+164 AO 0235+16 02 38 38.9 +16 36 59 0.94
0420−014 PKS 0420−01 04 23 15.8 −01 20 33 0.914
0528+134 PKS 0528+134 05 30 56.4 +13 31 55 2.06
0716+714 S5 0716+71 07 21 53.4 +71 20 36 0.3
0735+178 PKS 0735+17 07 38 07.4 +17 42 19 0.424
0827+243 OJ 248 08 30 52.1 +24 11 00 0.939
0829+046 OJ 49 08 31 48.9 +04 29 39 0.173683
0836+710 4C 71.07 08 41 24.3 +70 53 42 2.172
0851+202 OJ 287 08 54 48.9 +20 06 31 0.306
0954+658 S4 0954+65 09 58 47.2 +65 33 55 0.368
1101+384 Mkn 421 11 04 27.3 +38 12 32 0.030021
1156+295 4C 29.45 11 59 31.8 +29 14 44 0.729
1219+285 ON 231 12 21 31.7 +28 13 59 0.102
1226+023 3C 273 12 29 06.7 +02 03 09 0.158339
1253−055 3C 279 12 56 11.1 −05 47 22 0.5362
1510-089 PKS 1510−08 15 12 50.5 −09 06 00 0.36
1553+113 PG 1553+113 15 55 43.0 +11 11 24 0.36
1611+343 DA 406 16 13 41.0 +34 12 48 1.401
1633+382 4C 38.41 16 35 15.5 +38 08 04 1.81357
1641+399 3C 345 16 42 58.8 +39 48 37

0.5928

1652+398 Mkn 501 16 53 52.2 +39 45 37 0.033663
1739+522 4C 51.37 17 40 37.0 +52 11 43 1.375
1807+698 3C 371 18 06 50.7 +69 49 28 0.051
2155−304 PKS 2155−304 21 58 52.0 −30 13 32 0.116
2200+420 BL Lacertae 22 02 43.3 +42 16 40 0.0686
2230+114 CTA 102 22 32 36.4 +11 43 51 1.037
2251+158 3C 454.3 22 53 57.7 +16 08 54 0.859
2344+514 1ES 2344+514 23 47 04.8 +51 42 18 0.044