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Closest O type stars

Reading the book of F.D. Seward and P.A. Charles, “Exploring the X-ray Universe”, I found out some really massive and luminous O type stars that are close by and can be pointed out easily at the night sky:

star distance (kpc) magnitude (V) spectral type
ζ Pup 0.44 2.3 O4If
δ Ori 0.5 2.2 O9.5II
θ Ori C (*) 0.5 5.1 O6V
ζ Ori 0.5 1.6 O9.7Ib
η Car (*) 2.6 -1 to 7 LBV

(*): binary systems