F8IV

JM53, Cowley74, and Houk88 list ups Peg (HR 8905 = HD 220657) 
as their F8IV standard.

MK78 atlas shows the F8III-IV standard HR 8732, but does not 
show a "pure" class F8IV standard. 

# No Standard
MorganAbt72 and MK73 do not list a F8IV standard.

# Poor Standard
HD 220657 = HR 8905 = HIP 115623 = ups Peg (J2325+2324, V=4.4)
  F8III: MK43,MK78,Gray01
  F8IV: Cowley74(stan),Houk88(JM53),Jaschek64(most),Jaschek78(JM53)
  G0: Cannon
  G0IV: Barry70(uv metals weak)
  B-V=0.617, Mv=0.83, dMv=-3.75. 
  Gone from F8III (MK43) => F8IV (JM53) => F8III (MK78,Gray01).
  F8-something, probably "F8III" is most appropriate.