OJ 287

( PKS 0851+202,  S3 0851+20,  PG 0851+202,  B2 0852+20
1ES 0851+203,  RGB J0854+201,  3EG J0853+1941 )

Equat. coord. (J2000.0): R.A.: 08h 54m 48.9s  Dec.:  +20 06' 31''
z = 0.306


Chart field is 15'x15'

GASP suggested stars: 4 10 11

Optical photometry of comparison stars
(UBV: Johnson, RI: Cousins)

Star/Band

U

B

V

R

I

4

15.49 0.07

15.01 0.06

14.18 0.04

13.74 0.04

13.28 0.04

10

15.00 0.05

15.01 0.05

14.60 0.05

14.34 0.05

14.03 0.05

11

15.39 0.07

15.47 0.07

14.94 0.04

14.65 0.05

14.32 0.05

C1

...

...

15.88 0.07

15.50 0.07

15.08 0.07

C2

...

...

16.12 0.08

15.66 0.08

15.21 0.08

2

13.49 0.04

13.45 0.04

12.80 0.04

12.46 0.05

12.06 0.07

          Data references:
- stars 4, 10, 11, C1, C2 in VRI:   Fiorucci M. & Tosti G.  1996, A&AS 116, 403

- stars 4, 10, 11 in UB (and star 2 in UBVRI):  
Smith P. et al.  1985, AJ, 90, 1184