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Table 1

Comparison stars used for estimating the brightness of OJ287 on HCO plates around the year 1913.

ID RA Dec B V Reference

1 08:54:29.5 20:10:56 12.19 11.52 C77, star 1
2 08:55:15.6 20:09:44 13.49 12.80 C77, star 2
3 08:55:19.0 20:00:54 14.13 13.39 C77, star 7

Notes. The B and V magnitudes are the magnitudes given in C77, and RA and Dec are J2000 coordinates. These magnitudes are consistent with more recent estimates for instance from the UCAC4 catalog. The HCO data do not indicate any significant variability for any of these stars.

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