How to convert RC3 coded revised Hubble types 
           into standard revised Hubble types


The Third Reference Catalogue of Bright Galaxies (RC3; de Vaucouleurs G. 
et al. 1991) provides a *coded* revised Hubble type (Example: For NGC 1300, 
the coded revised Hubble type is ``.SBT4'')


The coded revised Hubble type can be converted into a more standard 
revised Hubble type by using the tables in Section 3.2 of the  Second 
Reference Catalogue of Bright Galaxies (RC2, de Vaucouleurs G. et al. 
1976).  For instance, NGC 1300 would be SBbc (rs). 

Below I provide a simple explanation of what each character of 
the coded revised Hubble type means, and hence,  how it can be 
converted  into a standard revised Hubble type.


1) Characters 1-2  

     ".L",         ".E",    ".S",      ".I",   
=  Lenticular,  Elliptical, Spiral,    Irr
=      S0,         E,         S,       Irr,    

   "CE",	       "CI"
= dwarf elliptical,    dwarf irregular
=  dE			  dIrr

    ".P",              "P.",        "R." 
= Peculiar P,  Pseudo Outer ring , Outer ring
=      P               (R')          (R)

Note: Peculiar galaxies may also be sometimes denoted by a 
"P" at the end of the coded Hubble type.


2) Subsequent characters

a) If characters 1-2  are ".E' "cE"then subsequent characters 
   represent the ellipticity  e.g.,

           .E0, .E0+, .E0-1, .E1-2, .E2, etc 

b)If characters 1-2  are ".S", ".L", ".I", "CI" then subsequent
    characters denote the following 

Bar types  B X A
         = strongly barred, weakly barred, unbarred
         = B, AB, A

Ring or spiral type  R S T
         = R for inner ring, S for s-shaped, T for mixed (transition)
         = approximately r, s, (rs)

Numerical index for Hubble type
         = 1 for a, 2 for ab, 3 for b, 4 for bc
         = 5 for c, 6 for cd, 7 for d, 8 for dm, 9 for m
         = 10 for Im, 11 for cI


		 EXAMPLES  
-------------------------------------------------------
  Revised Hubble    Meaning	     	Revised Hubble
  Type in RC3		                    Type in 
  coded from                             standard form 
========================================================
 .PSBR2           Peculiar, SB             P SBab(r)   
                 inner ring, ab,   
--------------------------------------------------------
  P.SBR2       Pseudo Outer ring (R')     (R') SBab(r)  
                 SB, inner ring, ab
--------------------------------------------------------
  .SBS0           Normal, S,B,             SB0(s)
                  s-shaped, 0  
--------------------------------------------------------
  .SXT1        Normal, S, AB, mixed        SABa(rs)  
                 ring/s-shaped, 
--------------------------------------------------------