grid’s size

s 0

α 0

[˚]

δ 0

[˚]

vdB92

0.5 ' × 0.5 '

2.2'

105.97917 ± 0.01248

−11.56889 ± 0.01222

vdB146

0.5 ' × 0.5 '

2.2'

325.71247 ± 0.03016

66.09753 ± 0.01222

vdB150

0.5 ' × 0.5 '

2.2'

332.41250 ± 0.04279

73.404167 ± 0.01222