M4.5III

A good M4.5III standard is HR 3577 (southernly accessible or otherwise),
however this is not necessarily the best one (need to investigate others)

Keenan89 standard: HD 76830 (=HR 3577) - M4.5III
		   BY Boo (=HD 123657) - M4.5III
		   HD 151732 - M4.5III
		   HD 200527 - M4.5III
		   HD 204585 - M4.5IIIa
		   bet Gru - M4.5III
		 

# Primary standard

HR 3577 = HD 76830 (J0859+1808; V=6.4)
    M4III: Adams26,Roman55,Keenan80
    M4.5III: Keenan89,Keenan99
    Mb: Cannon 
    M4: Lee47
    M4+III: GrayCorbally10(stan)

    Adopt "M4.5III" from Keenan99