name obs_date mag_b mag_v
 M31 2012-01-02 17.0 17.5
 M31 2012-01-02 17.1 17.4
M101 2012-01-02 15.1 13.5
 M82 2012-02-14 16.2 14.5
 M31 2012-02-14 16.9 17.3
 M82 2012-02-14 15.2 15.5
M101 2012-02-14 15.0 13.6
 M82 2012-03-26 15.7 16.5
M101 2012-03-26 15.1 13.5
M101 2012-03-26 14.8 14.3