[]? Tycho-1 VT or Hp magnitude (4) Note (4) :
Blank when no magnitude is available.
For Hipparcos stars with no VT, Hp is given instead of VT, and BT is blank.
UCD:
PHOT_TYCHO_V = Tycho Magnitude V_T_
UCD1+:
phot.mag;em.opt.V = Photometric magnitude in Optical V band between 500 and 600 nm