3C 273 = 1226+023
DSS image: 15 x 15 arcmin
R.A. (J2000.0)= 12 29 06.7
Dec. (J2000.0)= +02 03 09
Recommended standard stars
| Star | B | Err B | V | Err V | R | Err R | I | Err I |
|---|---|---|---|---|---|---|---|---|
| 1 | 12.85 | 0.05 | 11.87 | 0.04 | 11.30 | 0.04 | 10.74 | 0.04 |
| 2 | 13.33 | 0.07 | 12.69 | 0.04 | 12.27 | 0.05 | 11.84 | 0.04 |
| 3 | 14.12 | 0.05 | 13.56 | 0.05 | 13.16 | 0.05 | 12.83 | 0.05 |