ACDS V10.0 - Detailed Description of B/denis

ACDS V10.0 - Thu Jan 16 13:52:48 CET 2025

| # Detailed Description of B/denis : The DENIS database (DENIS Consortium, 2005) |

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/denis             The DENIS database                  (DENIS Consortium, 2005)
    ================================================================================
    Third release of DENIS data (20 September 2005)
          DENIS consortium
         <The DENIS consortium (2005)>
         =2005yCat.2263....0D
    ================================================================================
    ADC_Keywords: Infrared sources ; Photometry, infrared ; Surveys

    Keywords: infrared: stars - Galaxy: stellar content -
              stars: low-mass, brown dwarfs -
              astronomical data bases: miscellaneous - surveys

    Description:
        This catalogue is the latest incremental release of the DENIS project.
        It consists of a set of 355,220,325 point sources detected by the
        DENIS survey in 3662 strips (covering each 30 degrees in declination
        and 12 arcmin in right ascension). The data in this release cover
        approximately 16700 square degrees of the Southern sky. Multiple
        detections of single point sources have been merged in image overlaps
        within individual strips, but sources can have multiple detections in
        overlaping strips.

        DENIS is the only astronomical survey of the Southern sky made in two
        near-infrared bands (J at 1.25µm, and Ks at 2.15µm) and one
        optical band (Gunn-i at 0.82µm), with limiting magnitudes 16.5, 14
        and 18.5, respectively. Saturation magnitudes are Ks=6, J=7.5 and
        Gunn-i=9.8mag. It was conducted by a European consortium, using the
        1m telescope at ESO, La Silla (Chile).

        The DENIS instrument is made up of a 3-channel camera built of
        commercially available detector arrays by the Observatoire de Paris
        and with major contributions from other European Institutes, notably:
        the IAS in Frascati, the Observatoire de Grenoble, the University of
        Innsbruck, the Observatoire de Lyon, and the IAC in Tenerife. The
        survey is carried out by observing strips of 30° in declination
        and 12arcminutes in Right Ascension with an overlap of 2 arcminutes
        between consecutive strips. The survey started at the end of 1995 and
        has been completed up to 97% in 2001. The data have been reduced at
        the Institut d'Astrophysique de Paris and Observatoire de Paris. The
        position of a general extracted point source is provided with an
        accuracy better than 1arcsec and its magnitude to better than 0.1 mag.
        The Centre de Donnees Astronomiques de Strasbourg (CDS) is releasing
        the final databases and provides access of the processed and
        calibrated data to the worldwide community.

        The principal investigator of the DENIS project is N. Epchtein
        (Observatoire de la Cote d'Azur); the Co-PI in charge of data
        processing is G. Simon (observatoire de Paris); J. Borsenberger and
        B. de Batz, with the help of F. Tanguy, S. Begon and P. Texier,
        processed the data and implemented the working data base at PDAC;
        S. Derriere is in charge of the data release at CDS. Scientists and
        engineers from seven European countries and from Brazil are involved
        in the data qualification and analysis.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   The present file
    × denis.sam        479     1000   Sample of DENIS output

    See also:
        http://cdsweb.u-strasbg.fr/denis.html : DENIS documentation
        A&A 349, 236 (1999) : Preliminary database of DENIS point sources
        A&A 141, 313 (2000) : An Absolute Calibration of DENIS
        J/A+AS/135/133 : First DENIS I-band extragalactic catalog (Vauglin+ 1999)

    Nomenclature Notes:
        The recommended way to designate the DENIS sources is JHHMMSS.s-DDMMSS

    Byte-by-byte Description of file:  denis.sam

       Bytes Format Units    Label     Explanations

       1- 16  A16   ---      DENIS     DENIS name, identifier
      18- 24  I7    ---      Image     DENIS image number (1)
      26- 30  I5    ---      Strip     DENIS strip number
      32- 41  F10.6 deg      RAdeg     Right ascension (J2000)
      43- 52  F10.6 deg      DEdeg     Declination (J2000)
    --------------------------------------------------------------------------------
      54- 59  F6.3  mag      Imag      ?Magnitude in I band from PSF fit
      61- 65  F5.2  mag      e_Imag    ?Magnitude error in I band from PSF fit
      67- 72  F6.3  mag      Jmag      ?Magnitude in J band from PSF fit
      74- 78  F5.2  mag      e_Jmag    ?Magnitude error in J band from PSF fit
      80- 85  F6.3  mag      Kmag      ?Magnitude in K band from PSF fit
      87- 91  F5.2  mag      e_Kmag    ?Magnitude error in K band from PSF fit
      93- 98  F6.3  mag      Imag5.5   ?Magnitude in I band from 5.5'' aperture
     100-104  F5.2  mag     e_Imag5.5  ?Error in I band mag from 5.5'' aperture
     106-111  F6.3  mag      Jmag5.5   ?Magnitude in J band from 5.5'' aperture
     113-117  F5.2  mag     e_Jmag5.5  ?Error in J band mag from 5.5'' aperture
     119-124  F6.3  mag      Kmag5.5   ?Magnitude in K band from 5.5'' aperture
     126-130  F5.2  mag     e_Kmag5.5  ?Error in K band mag from 5.5'' aperture
     132-137  F6.3  mag      Imag4.5   ?Magnitude in I band from 4.5'' aperture
     139-143  F5.2  mag     e_Imag4.5  ?Error in I band mag from 4.5'' aperture
     145-150  F6.3  mag      Jmag4.5   ?Magnitude in J band from 4.5'' aperture
     152-156  F5.2  mag     e_Jmag4.5  ?Error in J band mag from 4.5'' aperture
     158-163  F6.3  mag      Kmag4.5   ?Magnitude in K band from 4.5'' aperture
     165-169  F5.2  mag     e_Kmag4.5  ?Error in K band mag from 4.5'' aperture
     171-176  F6.3  mag      Imag3.5   ?Magnitude in I band from 3.5'' aperture
     178-182  F5.2  mag     e_Imag3.5  ?Error in I band mag from 3.5'' aperture
     184-189  F6.3  mag      Jmag3.5   ?Magnitude in J band from 3.5'' aperture
     191-195  F5.2  mag     e_Jmag3.5  ?Error in J band mag from 3.5'' aperture
     197-202  F6.3  mag      Kmag3.5   ?Magnitude in K band from 3.5'' aperture
     204-208  F5.2  mag     e_Kmag3.5  ?Error in K band mag from 3.5'' aperture
     210-215  F6.3  mag      Imag3.5c  ?I band Magnitude in 3.5'' corr. aperture
     217-221  F5.2  mag    e_Imag3.5c  ?I band mag error in 3.5'' corr. aperture
     223-228  F6.3  mag      Jmag3.5c  ?J band Magnitude in 3.5'' corr. aperture
     230-234  F5.2  mag    e_Jmag3.5c  ?J band mag error in 3.5'' corr. aperture
     236-241  F6.3  mag      Kmag3.5c  ?K band Magnitude in 3.5'' corr. aperture
     243-247  F5.2  mag    e_Kmag3.5c  ?K band mag error in 3.5'' corr. aperture
     249-254  F6.3  mag      Imag2.5c  ?I band Magnitude in 2.5'' corr. aperture
     256-260  F5.2  mag    e_Imag2.5c  ?I band mag error in 2.5'' corr. aperture
     262-267  F6.3  mag      Jmag2.5c  ?J band Magnitude in 2.5'' corr. aperture
     269-273  F5.2  mag    e_Jmag2.5c  ?J band mag error in 2.5'' corr. aperture
     275-280  F6.3  mag      Kmag2.5c  ?K band Magnitude in 2.5'' corr. aperture
     282-286  F5.2  mag    e_Kmag2.5c  ?K band mag error in 2.5'' corr. aperture
     288-293  F6.3  mag      Imag1.5c  ?I band Magnitude in 1.5'' corr. aperture
     295-299  F5.2  mag    e_Imag1.5c  ?I band mag error in 1.5'' corr. aperture
     301-306  F6.3  mag      Jmag1.5c  ?J band Magnitude in 1.5'' corr. aperture
     308-312  F5.2  mag    e_Jmag1.5c  ?J band mag error in 1.5'' corr. aperture
     314-319  F6.3  mag      Kmag1.5c  ?K band Magnitude in 1.5'' corr. aperture
     321-325  F5.2  mag    e_Kmag1.5c  ?K band mag error in 1.5'' corr. aperture
    --------------------------------------------------------------------------------
     327-330  F4.1  mag      Rmag      ?R magnitude of USNOA2.0 nearest match
     332-335  F4.1  mag      Bmag      ?B magnitude of USNOA2.0 nearest match
     337-339  I3    ---      q_Imag    [0,100]?Quality flag for I band
     341-343  I3    ---      q_Jmag    [0,100]?Quality flag for J band
     345-347  I3    ---      q_Kmag    [0,100]?Quality flag for K band
     349-351  I3    ---      Ipsf      [0,100]?Correlation to PSF for I band
     353-355  I3    ---      Jpsf      [0,100]?Correlation to PSF for J band
     357-359  I3    ---      Kpsf      [0,100]?Correlation to PSF for K band
     361-364  F4.2  ---      IMpsf     [0,1]?Mean correlation to PSF in I band
     366-369  F4.2  ---      JMpsf     [0,1]?Mean correlation to PSF in J band
     371-374  F4.2  ---      KMpsf     [0,1]?Mean correlation to PSF in K band
     376-380  F5.1  pix      Ix        ?Pixel x position in I band
     382-386  F5.1  pix      Iy        ?Pixel y position in I band
     388-392  F5.1  pix      Jx        ?Pixel x position in J band
     394-398  F5.1  pix      Jy        ?Pixel y position in J band
     400-404  F5.1  pix      Kx        ?Pixel x position in K band
     406-410  F5.1  pix      Ky        ?Pixel y position in K band
    --------------------------------------------------------------------------------
     412-421  F10.6 deg      A2RAdeg   ?Right Ascension of USNOA2.0 nearest match
     423-432  F10.6 deg      A2DEdeg   ?Declination of USNOA2.0 nearest match
     434-441  F8.3  yr       A2Ep      ?Epoch of USNOA2.0 nearest match
     443-447  I5    mas      Dist      ?Distance to USNOA2.0 nearest match
     449-462  F14.6 d        ObsJD     Julian day for DENIS observation
     464-467  I4    ---      Iflg      ?Image and source flag in I band (2)
     469-472  I4    ---      Jflg      ?Image and source flag in J band (2)
     474-477  I4    ---      Kflg      ?Image and source flag in K band (2)
         479  I1    ---      mult      ?Multiplicity flag (3)

    Note (1): the image number is incremented at each image taken during the
         survey. In case a source results from the merging of two consecutive
         overlapping images (N and N+1) in the same strip (Flag_mult set to 1,
         see Note 3), the image number corresponds to the first image N.
    Note (2): This flag is the concatenation of image and source flags, in
              hexadecimal format.
        For the image flag, the first two digits contain:
            Bit 0   (0100) clouds during observation
            Bit 1   (0200) electronic Read-Out problem
            Bit 2   (0400) internal temperature problem
            Bit 3   (0800) very bright star
            Bit 4   (1000) bright star
            Bit 5   (2000) stray light
            Bit 6   (4000) unknown problem
        For the source flag, the last two digits contain:
            Bit 0   (0001) source might be a dust on mirror
            Bit 1   (0002) source is a ghost detection of a bright star
            Bit 2   (0004) source is saturated
            Bit 3   (0008) source is multiple detect
            Bit 4   (0010) reserved
    Note (3): if set to 1, this flag indicates that the source was detected in
         two consecutive images, and that the 2 measurements have been combined

    Acknowledgements:
        DENIS is the result of a joint effort involving human and financial
        contributions of several Institutes mostly located in Europe. It has
        been supported financially mainly by the French Institut National des
        Sciences de l'Univers, CNRS, and French Education Ministry, the
        European Southern Observatory, the State of Baden-Wuerttemberg, and
        the European Commission under networks of the SCIENCE and Human
        Capital and Mobility programs, the Landessternwarte, Heidelberg and
        Institut d'Astrophysique de Paris.

    References:
        The DENIS Consortium (September 2005)
    ================================================================================
    (End) G.Simon,B.de Batz,J.Borsenberger [Obs.Paris], S.Derriere[CDS]  20-Sep-2005