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VII/112             RC2 Catalogue  (de Vaucouleurs+ 1976)
The Second Reference Catalogue of bright galaxies (RC2)
     de Vaucouleurs G., de Vaucouleurs A., Corwin H.G.
    <University of Texas Press, Austin (1976)>
    =1976RC2...C......0D
ADC_Keywords: Galaxy catalogs


Description:
    This standardized documentation file does not contain a complete
    description of the electronic version of the RC2 catalogue;
    please refer to the "doc.tex" file prepared by Theresa A. Nagy and
    Robert S. Hill.

See also:
    VII/155 : "Third Reference Catalogue of bright galaxies" (RC3)
               by de Vaucouleurs G., de Vaucouleurs A., Corwin H.G.,
                Buta R.J., Paturel G. and Fouque P. (1991),
                with 23022 galaxies


File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
catalog          298     4364   The RC2 catalogue
doc.tex           81     1301   Complete LaTeX documentation (needs adc.sty)
adc.sty           78       68   Style file to process doc.tex


Byte-by-byte Description of file: catalog

   Bytes Format  Units     Label    Explanations

   1-  8  A8     ---       Name     RC2 identification (NGC, IC, or anonymous)
       9  A1     ---       m_Name   Component identification (A, B, C, etc.) (1)
  10- 11  I2     h         RAh      Hours RA, 1950.0
  12- 16  F5.2   min       RAm      Minutes RA, 1950.0
      17  A1     ---       DE-      Sign Dec, 1950.0
  18- 19  I2     deg       DEd      Degrees Dec, 1950.0
  20- 23  F4.1   arcmin    DEm      Minutes Dec, 1950.0
  24- 29  F6.2   deg       GLON     Galactic longitude
  30- 34  F5.1   deg       SGLON    Supergalactic longitude
  35- 41  A7     ---       MType    Revised morphological Type (Table 2)(9)
  42- 43  A2     ---       Hubble   Numerical Hubble Sequence Index T 
                                      (Table 3)(9)
      44  A1     ---      n_Hubble  [*RP$] Remark on Hubble Sequence Index (8)
  45- 48  A4     ---       Plate    Source of plate (Table 4)(9)
      49  A1     ---       r_MType  Morphological type author code (Table 5)(9)
  50- 56  A7     ---      Yerkes_1  Yerkes list 1 type and color classes (6)
      57  I1     ---       Byurkan  [1/5]? Nuclear type in Byurkan system (2)
      58  A1     ---     n_Byurkan  [*$S2-5] Note on Byurkan nucleus type (2)
  59- 62  F4.2 [0.1arcmin] logD25   ? Major isophotal diameter, log(D_25)
  63- 66  F4.2   ---       logR25   ? Ratio major to minor diameter, log(R_25)
  67- 70  F4.2 [0.1arcmin] logD(0)25  ? Face-on major isophotal diameter
  71- 74  F4.2 [0.1arcmin] logAe    ? Effective aperture diameter, log(Ae)
      75  A1     ---       u_logAe  [*$] '*'=uncertain, '$'=doubtful
  77- 81  A5     ---       ID       Object identifications (9)
  82- 88  F7.2  0.01min/yr precRAm  Centennial precession in RA, minutes
  89- 93  F5.1 0.01arcmin/yr precDEm  Centennial precession in DE, arcminutes
  94- 99  F6.2   deg       GLAT     Galactic latitude
 100-104  F5.1   deg       SGLAT    Supergalactic latitude
 105-112  A8     ---       DDOType  David Dunlap Obs. (van den Bergh) type (7)
     113  I1     ---      DDOClass  ? David Dunlap Obs. luminosity class (7)
     114  A1     ---    u_DDOClass  [*$] '*'=uncertain, '$'=doubtful
 115-117  F3.1   ---       Weight   ]0/5]? Plate material weight (9)
 118-124  A7     ---      Yerkes_2  Yerkes list 2 type and nuclear class (6)
 125-128  A4     ---       RC1      RC1 nuclear class (9)
 129-132  F4.3 [0.1arcmin] e_logD25  ? Mean error of logD25
 133-136  F4.3   ---      e_logR25  ? Mean error of logR25
 137-140  F4.2 [0.1arcmin] D0       ? Corrected log(D(0)25) for galactic extinc.
 141-143  F3.2 [0.1arcmin] e_logAe  ? Mean error of log(Ae)
 145-148  F4.1   mag       Hmag     ? Harvard photographic magnitude, mH
     149  A1     ---       u_Hmag   [*] if Hmag uncertain
 150-154  F5.2   mag       BT       ? Total asymptotic B magnitude (BT)
     155  A1     ---       n_BT     [*S] Flag on BT, see note (3)
 156-159  F4.1 mag/arcsec2 SuBr     ? Mean B surface brightness within Ae (9)
 160-163  F4.2   mag       Extinct  ? Galactic extinction in B system (A_B) (9)
 164-167  F4.2   mag       (B-V)T   ? Asymptotic color index (9)
     168  A1     ---      n_(B-V)T  [*] Flag on (B-V)T, see comment (3)
 169-172  F4.2   mag       (U-B)T   ? Asymptotic color index (9)
     173  A1     ---      n_(U-B)T  [*] Flag on (U-B)T, see comment (3)
 174-177  F4.2   mag       (B-V)Ae  ? Effective aperture color index (9)
     178  A1     ---     n_(B-V)Ae  [*] Flag on (B-V)Ae, see comment (3)
 179-182  F4.2   mag       (U-B)Ae  ? Effective aperture color index (9)
     183  A1     ---     n_(U-B)Ae  [*] Flag on (U-B)Ae, see comment (3)
 184-187  F4.2   mag       B-V      ? Total B-V color index, corrected (9)
 188-191  F4.2   [10mJy]   logS_R   ? Radio continuum flux near 1.4GHz (21cm)
     192  A1     ---      nlogSR  [$+*] Conditional code for logS_R (4)
 193-196  F4.2   ---      SpIndex1  ? Spectral index, α- for ν < ν_R
     197  A1     ---    u_SpIndex1  [$*] '*'=uncertain, '$'=very uncertain
 198-201  F4.2 [10-22W/m2] logS_H   ? Integrated HI flux density
     202  A1     ---      nlogSH  [$+*] Conditional code for logS_H (4)
 203-207  F5.2   mag       RIndex   ? Corrected radio index (RI) (9)
     208  A1     ---      u_RIndex  [$] '$' for doubtful RIndex value
 209-213  I5     km/s      RadVel   ? Observed Radial velocity (cz)
     214  A1     ---      u_RadVel  [*] '*' if discrepant RadVel values
 215-219  I5     km/s      RadVel0  ? Radial velocity corrected for solar motion
 220-222  A3     ---      Appendix  [PST ] Appendices codes, see comment (5)
 225-234  A10    ---       Zwicky   Zwicky identifications
 235-239  F5.2   mag      HmagCorr  ? Corrected Harvard photog. magnitude (9)
 240-242  F3.2   mag       e_BT     ? Estimated mean error of BT (9)
 243-246  F4.1 mag/arcsec2 SuBrAv   ? Average surface brightness (9)
 247-251  F5.2   mag       BT0      ? Corrected face-on magnitude (9)
 252-254  F3.2   mag      e_(B-V)T  ? Mean error of asymptotic color (9)
 255-257  F3.2   mag      e_(U-B)T  ? Mean error of asymptotic color (9)
 258-260  F3.2   mag     e_(B-V)Ae  ? Mean error of effective color (9)
 261-263  F3.2   mag     e_(U-B)Ae  ? Mean error of effective color (9)
 264-267  F4.2   ---       (U-B)T0  ? Total corrected U-B color index (9)
 268-269  I2     ---    o_SpIndex1  ? Number of radio continuum measurements
 270-271  I2     ---      ologSR  ? Number of radio measurements for logS_R
 272-273  I2     ---    o_SpIndex2  ? Number of radio continuum measurements
 274-277  F4.2   ---      SpIndex2  ? Spectral index, α+ for ν > ν_R
     278  A1     ---    u_SpIndex2  [$*] '*'=uncertain, '$'=very uncertain
     279  I1     ---      ologSH  ? Number of 21cm emission line observations
 280-282  F3.2   0.4mag    A21      ? Self-absorption at 21 cm (1.4GHz)
 283-287  F5.2   mag       HI       ? Neutral hydrogen index (9)
     288  A1     ---       u_HI     [$] '$' if HI is doubtful
     289  I1     ---     o_RadVelR  ? Number of radio observations for RadVel
 290-291  I2     ---     o_RadVelO  ? Number of optical observations for RadVel
 292-294  I3     km/s     e_RadVel  ? Radial velocity mean error
 295-298  I4     km/s      DVelSun  Solar motion correction, delta V

Note (1): A '.' indicates double or multiple objects where the data refers
    to the combined objects, but the classification is the brightest
    component.
Note (2):
    See details in doc.tex; nuclear type has the values
      1 = no central condensation
      2 = weak central condensation
      3 = strong central condensation but no star-like image
      4 = star-like nuclear image at short exposure but nebulous at
          long exposure
      5 = star-like nuclear image even at long exposures.
    The additional n_Byurkan flag may also contain a second Byurkan
    type when two independent classifications are given.
    Otherwise, this flag contains the symbols:
      S = small nucleus
      * = uncertain
      $ = doubtful
Note (3): The flag on BT or asymptotic colors has the following meaning:
     '*' if no total magnitude could be derived with single aperture
         observations requiring corrections in excess of 0.5 mag.
     'S' if magnitude or color is a weighted mean.
Note (4): the flag on logS has the approximate meaning
          (see doc.tex for details):
     '$' indicates discrepancies
     '*' indicates uncertainty
     '+' if a close pair was in the beam
Note (5): indicates objects that have entries in the special appendices
          of the published catalogue:
     'P': source of photographs in 18 atlases and major surveys;
     'S': galaxies with supernovae;
     'T': Hubble-Sandage and Hubble-Holmberg types.
Note (6): see details about Yerkes color and class on doc.tex, Table 6

Note (7): see details about van den Bergh type and classes in doc.tex,
          Table 7.
Note (8): The flag concerning the numerical Hubble type is
     'P'=peculiar
     'R'=note
     '$'=doubtful
     '*'=uncertain
Note (9): See documentation file doc.tex



Historical Notes:
  * See section 3 in "doc.tex"
  * available on the NASA "Selected Astronomical Catalogs" Vol. 1 CD-ROM,
    directory  /nonstell/galaxies/rc2
  * 13-Sep-1995 (CDS): compared to the CD-ROM version:
    - the decimal point was inserted when declination is given to
      the arcmin accuracy in file "catalog"
    - the document file "doc.tex" was corrected according to Harold
      Corwin's comments (except for units of radio fluxes)
    - the standardized "ReadMe" file was created
(End)                                     Francois Ochsenbein [CDS]  13-Sep-1995