B0.5III

The best standard is eps Per, however the best southernly accessible
standard is kap Aql.

MK43 standard:	       eps Per - B0.5III
Morgan50 standard:     kap Aql - B0.5III
JM53 standard:	       kap Aql - B0.5III
Garrison67 standard:   kap Aql - B0.5III
Lesh68 prim. standard: kap Aql (n) - B0.5III
Lesh68 sec. standard:  1 Cas - B0.5III
Walborn71 standard:    1 Cas - B0.5III
MK73 dagger standard:  eps Per (=HR 1220) - B0.5III
Garrison77 standard:   kap Aql - B0.5III
MK78 standard:	       eps Per (=HD 24760) - B0.5III
Gray Nstars standard:  eps Per (=HR 1220) - B0.5III

# No standard

Hiltner69 does not list a B0.5III standard.

# Primary standard

eps Per = HR 1220 (J0357+4000; V=2.9)
   *B0.5III: MK43,Lesh68,MK73(dagger),MK78,GrayNstars
    B0.7III: Walborn71(stan)
    B0.5V: Chalonge52,Murphy69
    B0III/IV: Zorec09
    B0III: Berger62
    B1.5III: Abt83

    Southern of 9" pair. Lesh68 used kap Aql and 1 Cas as "B0.5III"
    standards, but also classified eps Per as a "B0.5III" (but not a
    standard).

# Secondary standard

kap Aql = HD 184915 = HR 7446 (J1936-0701; V=5.0)
   *B0.5III: Morgan50,JM53,Garrison67(stan),Lesh68(B0.5IIIn),Garrison77(stan),Slettebak82

1 Cas = HR 8797 = HD 218376 (J2306+5925; V=4.8)
   *B0.5III: Lesh68(sec.stan.), Walborn71(stan), Zorec09
    B0.5IV: Morgan55