ACDS V10.0 - Detailed Description of B/ocl

ACDS V10.0 - Sun Jan 19 04:08:56 CET 2025

| # Detailed Description of B/ocl : Optically visible open clusters and Candidates (Dias+ 2002-2015) |

Note : this is the description file of the original catalog. This HTML page corresponds well to the original description, but some minor changes in the format may have been introduced in the FITS output files in order to allow for arithmetic operations on quantities such as coordinates and times. h:m:s and d:m:s units are normally converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the units; the value given in the HTML files supersedes the value indicated in the ReadMe file for this catalogue.

    B/ocl     Optically visible open clusters and Candidates (Dias+ 2002-2015)
    ================================================================================
    New catalog of optically visible open clusters and candidates (V3.5)
        Dias W.S., Alessi B.S., Moitinho A., Lepine J.R.D.
       <Astron. Astrophys. 389, 871 (2002)>
       =2002A&A...389..871D
    ================================================================================
    ADC_Keywords: Clusters, open ; Proper motions ; Radial velocities ;
                  Abundances, [Fe/H]
    Keywords: galaxy: open clusters and associations: general - catalogs

    Description:
        We have compiled a new catalogue of open clusters in the Galaxy which
        updates the previous catalogues of Lynga (1987, Cat. VII/92) and of
        Mermilliod (1995, in Information and On-Line Data in Astronomy, ed. D.
        Egret & M. A. Albrecht (Dordrecht: Kluwer), 127) (included in the
        WEBDA database, http://obswww.unige.ch/webda). New objects and new
        data, in particular, data on kinematics (proper motions) that were not
        present in the old catalogues, have been included. Virtually all the
        clusters (2167) presently known were included, which represents an
        increment of about 986 objects relative to the Lynga (1987, VII/92)
        catalogue. The catalogue is presented in a single table containing all
        the important data, which makes it easy to use.

        In total, 99.7% of the objects have estimates of their apparent
        diameters, and 74.5% have distance, E(B-V) and age determinations.
        Concerning the data on kinematics, 54.7% have their mean proper
        motions listed, 25% their mean radial velocities, and 24.2% have both
        information simultaneously.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × whatsnew.txt     177     8771   Statistics and History of the Catalogue
    × clusters.dat     152     2167   The Catalogue Data File (V3.5)
    × refs.dat         130       92   References for proper motions and radial velocities
    × removed.dat      174      147   Removed clusters (V3.5)
    × sources.dat      182     1803   References (V3.5)
    × phot.dat          44      569   Available photometric data (on Jan 23 2002)

    See also:
        VII/92 : Open Cluster Data 5th Edition (Lynga 1987)
       VII/101 : Star Clusters/Associations. III. Open Clusters (Ruprecht+ 1983)
       http://www.astro.iag.usp.br/ocdb/  : Open clusters and Galactic structure
       http://obswww.unige.ch/webda       : WEBDA database

    Byte-by-byte Description of file:  clusters.dat

       Bytes Format Units    Label   Explanations

       1- 17  A17   ---     Cluster  Cluster name
      19- 20  I2    h        RAh     Right Ascension J2000 (hours)
      22- 23  I2    min      RAm     Right Ascension J2000 (minutes)
      25- 26  I2    s        RAs     Right Ascension J2000 (seconds)
          28  A1    ---      DE-     Declination J2000 (sign)
      29- 30  I2    deg      DEd     Declination J2000 (degrees)
      32- 33  I2    arcmin   DEm     Declination J2000 (minutes)
      35- 36  I2    arcsec   DEs     Declination J2000 (seconds)
      38- 39  A2    ---      Class   Flag for classification of the cluster (G1)
      42- 47  F6.1  arcmin   Diam    [0.2/1400]? Angular apparent diameter
      49- 53  I5    pc       Dist    [25/15000]? Distance from WEBDA
      55- 59  F5.3  mag      E(B-V)  [0/6]? Colour excess in BV
      61- 66  F6.3  [yr]     Age     [6/10.1]? Age (in log t)
      68- 74  F7.2  mas/yr   pmRA    ? Mean proper motion of the cluster in RA
      76- 79  F4.2  mas/yr   e_pmRA  ? Standard deviation in pmRA
      81- 87  F7.2  mas/yr   pmDE    ? Mean proper motion of the cluster in Dec
      89- 92  F4.2  mas/yr   e_pmDE  ? Standard deviation in pmDE
      94- 98  I5    ---      Nc      [1/14341]? Estimated number of cluster members
     100-102  A3    ---      r_pmRA  Source of mean pm determination, in refs.dat
     105-111  F7.2  km/s     RV      ? Radial Velocity
     114-118  F5.2  km/s     e_RV    ? Error in Radial Velocity
     120-122  I3    ---      o_RV    [0/537]? Number of stars used to determine RV
     124-127  A4    ---      r_RV    Source of mean RV determination, in refs.dat
     129-134  F6.3  Sun      [Fe/H]  [-1.6/0.5]? Metallicity
     136-140  F5.3  Sun    e_[Fe/H]  ? Error in [Fe/H]
     142-143  I2    ---    o_[Fe/H]  [0/60]? Number of stars used
                                             to determine [Fe/H]
     145-152  A8    ---      TrType  Trumpler type determined in the DSS inspection
                                     (concentration-brightness-richness-nebulosity)

    Byte-by-byte Description of file:  refs.dat

       Bytes Format Units   Label     Explanations

       1-  4  A4    ---     Ref       Reference code
       8- 26  A19   ---     BibCode   Bibcode of the references
      28-130  A103  ---     Text      Author(s) names and comments

    Byte-by-byte Description of file:  sources.dat

       Bytes Format Units   Label     Explanations

       1- 23  A23   ---     Object    Objects associated with the reference
      25-182  A158  ---     Com       Comments, including the bibcode

    Byte-by-byte Description of file:  removed.dat

       Bytes Format Units   Label     Explanations

       1- 17  A17   ---     Cluster   Cluster name
      19- 20  I2    h       RAh       Right Ascension J2000 (hours)
      22- 23  I2    min     RAm       Right Ascension J2000 (minutes)
      25- 26  I2    s       RAs       Right Ascension J2000 (seconds)
          29  A1    ---     DE-       Declination J2000 (sign)
      30- 31  I2    deg     DEd       Declination J2000 (degrees)
      33- 34  I2    arcmin  DEm       Declination J2000 (minutes)
      36- 37  I2    arcsec  DEs       Declination J2000 (seconds)
      41- 46  F6.1  arcmin  Diam      ? Angular apparent diameter
      50- 78  A29   ---     Reason    Reason of removing the cluster
      80-174  A95   ---     Ref       Reference used for deletion

    Byte-by-byte Description of file:  phot.dat

       Bytes Format Units  Label    Explanations

       1- 17  A17   ---    Cluster  Cluster name
      19- 23  A5    ---    CCD      [UBVRI ] Bands observed with CCD
      25- 29  A5    ---    Pe       [UBVRI ] Bands observed with photomultipliers
      31- 33  A3    ---    Pg       [UBV ] Bands observed with photographic plates
      35- 44  A10   ---    Alias    Other name

    Global notes:

    Note (G1): The flag has the following meaning:
       a = possible asterism/dust hole/star cloud (no cluster)
      cr = Cluster Remnant (Pavani and Bica 2007A&A...468..139P)
       d = dubious, objects considered doubtful by the DSS images inspection
       e = embedded open cluster (or cluster associated with nebulosity)
       g = possible globular cluster
       m = possible moving group
       n = "non-existent NGC" (RNGC, Sulentic, 1979, Cat. VII/1). Some of
           Bica's POCRs (Possible Open Cluster Remnant, 2001A&A...366..827B)
           are also "non-existent NGC" objects.
      nf = objects not found in the DSS images inspection (wrong coordinates?)
       o = possible OB association (or detached part of)
      oe = o + e
     oev = o + e + v
       p = POCR (Possible Open Cluster Remnant) - Bica et al., 2001A&A...366..827B
       r = recovered, i.e. "non-existent NGC" that are well visible
           in the DSS images inspection
       v = clusters with variable extinction (Ahumada et al., 2001A&A...377..845A)
      OC = likely cluster (Kronberger M, private communication)
     OC? = possible cluster (Kronberger M, private communication)
      IR = discovered in infra-red but are visible in the DSS images inspection

    History (see also the file "whatsnew.txt"):
        Version of 08-Aug-2002 at http://www.astro.iag.usp.br/~wilton
        Version of 01-Jun-2003 at http://www.astro.iag.usp.br/~wilton (version 1.5)
        Version of 03-Jul-2003 at http://www.astro.iag.usp.br/~wilton (version 1.6)
        Version of 03-Sep-2003 at http://www.astro.iag.usp.br/~wilton (version 1.7)
        Version of 10-Sep-2003 at http://www.astro.iag.usp.br/~wilton (version 1.8)
        Version of 15-Feb-2004 at http://www.astro.iag.usp.br/~wilton (version 1.9)
        Version of 07-Jun-2004 at http://www.astro.iag.usp.br/~wilton (version 2.0)
        Version of 06-Jan-2005 at http://www.astro.iag.usp.br/~wilton (version 2.1)
        Version of 14-Jan-2006 at http://www.astro.iag.usp.br/~wilton (version 2.4)
        Version of 17-Sep-2007 at http://www.astro.iag.usp.br/~wilton (version 2.8)
        Version of 23-Apr-2008 at http://www.astro.iag.usp.br/~wilton (version 2.9)
        Version of 19-Feb-2009 at http://www.astro.iag.usp.br/~wilton (version 2.10)
        Version of 23-Apr-2010 at http://www.astro.iag.usp.br/~wilton (version 3.0)
        Version of 28-Jan-2012 at http://www.astro.iag.usp.br/~wilton (version 3.2)
      * 19-Sep-2002: Galactic coordinates and proper motions recomputed
           from the equatorial position. Stored as catalog VII/229
      * 12-Jan-2006: Installation of version 2.4 (VII/229)
      * 02-Oct-2007: Installation of version 2.8 (B/ocl).
           In file "phot.dat" a few names were changed to match the cluster
           names in the files "clusters.dat" and "removed.dat":
           Basel 19 = Hogg 16 ; Collinder 258 = Harvard 5;
           ESO 096-04 = BH 144; Stock 7 = Markarian 6
      * 27-Apr-2010: Installation of version 3.0 (2095 clusters), from
           http://www.astro.iag.usp.br/~wilton
      * 30-Jan-2012: Installation of version 3.2 (2134 clusters), from
           http://www.astro.iag.usp.br/~wilton
      * 16-Jan-2013: Installation of version 3.3 (2174 clusters), from
           http://www.astro.iag.usp.br/~wilton
      * 30-Jun-2013: Installation of version 3.4 (2168 clusters), from
           http://www.astro.iag.usp.br/~wilton
      * 11-sep-2015: Installation of version 3.4b  (corrections)
      * 17-feb-2016: Installation of version 3.5

    Acknowledgements:
       Extensive use has been made of the Simbad and WEBDA databases.
       This project is supported by FAPESP (grant number 03/12813-4)
       and CAPES (CAPES-GRICES grant number 040/2008)
    ================================================================================
    (End)                  Francois Ochsenbein [CDS]                     13-Oct-2014