valerio.nascimbeni on 19-Jun-2019 08:31:21 GMT about BD+07 738
I don't know where the M0 spectral type comes from (perhaps Egan 1996?), but it is clearly wrong. Basing on its colors and on Gaia spectrophotometry, this could be a late A star (A7V?)
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View annotation on BD+07 738 object