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This description is an excerpt from the Documentation for the Computer-Readable Version of the Second Reference Catalogue of Bright Galaxies (RC2), catalogue numbered VII/122, prepared by Theresa A. Nagy and Robert S. Hill (April 1981), revised by Suzan E. Gessner and Lee E. Brotzman (December 1990) for NASA Goddard Space Flight Center, Greenbelt, MD 20771

Contents:


1  Coding of revised morphological types

 
Classes Families Varieties Stages T Type Code
Ellipticals Compact 6 cE cE . . . Ellipt. (0–6) 5 E0 . E . 0 . Intermediate 5 E0–1 . E . 0+ ``cD'' 4 E+ . E+ . .
Lenticulars S0 . L Non-barred SA0 . LA Barred SB0 . LB Mixed SAB0 . LX Inner ring S(r)0 . L . R S-shaped S(s)0 . L . S Mixed S(rs)0 . L . T Early 3 S0- . L . .  Intermediate 2 S0 . L . . 0 Late 1 S0+ . L . . +
Spirals Non-barred SA . SA Barred SB . SB Mixed SAB . SX Inner ring S(r) . S . R S-shaped S(s) . S . S Mixed S(rs) . S . T 0/a 0 S0/a . S . . 0 a 1 Sa . S . . 1 ab 2 Sab . S . . 2 b 3 Sb . S . . 3 bc 4 Sbc . S . . 4 c 5 Sc . S . . 5 cd 6 Scd . S . . 6 d 7 Sd . S . . 7 dm 8 Sdm . S . . 8 m 9 Sm . S . . 9
Irregulars Non-barred IA . IA Barred IB . IB Mixed IAB . IX S-shaped I(s) . I . S Non-Magellanic 90 I0 . I . 0 Magellanic 10 Im . I . . 9 Compact 11 cI cI 
Peculiars 99 Pec . P Peculiarities Peculiarity pec . . . . . P
(All types) Uncertain : . . . . * Doubtful ? . . . . ? Spindle sp . . . . . / Outer ring (R) R . . . . . . Pseudo-outer R (R') P . . . . . .


2  Conversion of Hubble Types to Revised System


Hubble Revised T
E E -5 E-S0 L-: -3: S0 L -2 IrrII I0 0: S0/a S0/a 0 Sa Sa 1 Sa-b Sab 2 Sb Sb 3 Sb-c Sbc 4 Sc Scd: 6: Sc-Irr Sdm: 8: IrrI Im 10
S... S. 3? S``early'' S.(Sa?) 1? S``late'' S.Sc? 5?


3  Codes for telescope sources of revised types


Observatory Tel. Ap. Code Observatory Tel. Ap. Code (in.) (in.)
Palomar 200 P200. Mt. Wilson 60 W060. Lick 120 L120. Tautenburg 52 T052. Mt. Wilson 100 W100. Palomar (prints) 48 P048. McDonald 82 M082. Palomar (glass) 48 PG48. Radcliffe 74 R074. ESO 40 E040. Mt. Stromlo 74 S074. Siding Spring 40 S040. USNO (Flagstaff) 61 N061. Lick 36 L036. Boyden 60 B060. Mt. Stromlo 30 S030. Cordoba 60 C060.


4  Codes for author sources of revised types


Code Reference
....B Buta, R., Publ. Warner and Swasey Obs., II, in press, 1976 ....C Corwin, H. G., Publ. Dept. Astr. U. Texas, II, 2, No. 12, 1968; II, 3, No. 5, 1970; PASP, 83, 320, 1971; unpublished 1971-1975. ....F Fisher, J. R., and Tully, R. B., A&A, 44, 151, 1975 ....H Holmberg, E., et al., A&AS, 18, 463 and 491, 1974 ....N Nilson, P., UGC, 1973; Uppsala Obs. Rep. No. 5, 1974 ....R Rood, H. J., and Baum, W. A., AJ, 72, 398, 1967 ....V de Vaucouleurs, G., ApJS, No. 74, 1963; RC1, 1964; unpublished 1964-1975.


5  Codes for Yerkes (Morgan) types


Classes Type Code Classes Type Code
Elliptical E(0-7) E0 Irregular I I E-D ED S-I SI D-E DE I-S IS S-E SE I-B IB 1-3 Dusty D B-I BI 4-6 D-S DS Peculiarities L(1) ..L S-D SD P ..P 1-3 Spiral S S ?,:   * 4-6 Color Classes Code 5-6 Barred B B a A (B) SX af AF B-S BS f F S-B SB fg FG g G gk GK k K : *
(1) Low surface brightness


6  Coding of DDO (van den Bergh) Types


Classes Families Stages Type Coding Notes
Elliptical Ellipcicity (0-9) E0 E  0 (1)
Sprial Ordinary S S Barred SB S B Intermediate S (B) S X a Sa S  0 b- Sb- S  2 b Sb S  3 b+ Sb+ S  4 c Sc S  5 - S- S  6 + S+ S  7
Irregular Ir I Ir+ I  9
Peculiar P P Peculiarities Bright nucleus N N Nebulous arms, mild case (n)     N- (2) Nebulous arms, normal n     N Nebulous arms, extreme nn     N+ Patchy arms, mild case (*)     K- Patchy arms, normal *     K Patchy arms, extreme **     K+ Distorted arms,mild case (t)     T- Distorted arms, normal t     T Distorted arms, extreme tt     T+ Peculiarity p    P Uncertain ?,:,() *  *  * (3)
Luminosity Code Luminosity Code Classes Classes
I 1 III-IV 6 I-II 2 IV 7 II 3 IV-V 8 II-III 4 V 9 III 5
(1) Includes lenticulars, especially in ES, E9 (2) Combined cases are coded NK, NT, etc (3) Applies to symbol or group of symbols immediately preceding it

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