1226+023 (3C 273)

Coordinates
R.A. = 12:29:06.698, Dec. = +02:03:08.58 (2000)
z = 0.158339

Landessternwarte Heidelberg-Königstuhl

GASP suggested stars: C D E G

Comparison stars

Star	U	B	V	R	I
C	13.37 (0.03)	12.85 (0.05)	11.87 (0.04)	11.30 (0.04)	10.74 (0.04)
D	13.15 (0.05)	13.17 (0.05)	12.68 (0.04)	12.31 (0.04)	11.99 (0.06)
E	13.39 (0.09)	13.33 (0.07)	12.69 (0.04)	12.27 (0.05)	11.84 (0.04)
G	14.21 (0.07)	14.12 (0.05)	13.56 (0.05)	13.16 (0.05)	12.83 (0.05)

comparison stars from Smith et al., 1985, AJ 90, 1184

Field of view is 15'x15'