ACDS V10.0 - Detailed Description of I/284

ACDS V10.0 - Sun Jan 19 04:33:34 CET 2025

| # Detailed Description of I/284 : The USNO-B1.0 Catalog (Monet+ 2003) |

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.

    I/284               The USNO-B1.0 Catalog     (Monet+ 2003)
    ================================================================================
    The USNO-B Catalog
         Monet D.G., Levine S.E., Casian B., et al.
        <Astron. J., 125, 984 (2003)>
        =2003AJ....125..984M
    ================================================================================
    ADC_Keywords: Positional data; Proper motions; Surveys; Magnitudes

    Description:
        The USNO-B1.0 is a catalog that presents positions, proper motions,
        magnitudes in various optical passbands, and star/galaxy estimators
        for 1,045,913,669 objects derived from 3,648,832,040 separate
        observations. The data were taken from scans of 7,435 Schmidt plates
        taken from various sky surveys during the last 50 years.

        The catalog is expected to be complete down to V=21; the estimated
        accuracies are 0.2arcsec for the positions at J2000, 0.3mag in up to 5
        colors, and 85% accuracy for distinguishing stars from non-stellar
        objects.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × out.sam          248     1000   Sample of data (around 0+0)

    See also:
     https://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/icas/ : USNO
       Flagstaff Station Integrated Image and Catalogue Archive Service
     I/252 : The USNO-A2.0 Catalogue (Monet+ 1998)
     I/259 : The Tycho-2 Catalogue (Hog+ 2000)

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

       Bytes Format Units   Label     Explanations

       1- 12  A12   ---    USNO-B1.0  Designation of the object (1)
      14- 23  F10.6 deg     RAdeg     Right Ascension at Eq=J2000, Ep=J2000 (2)
      25- 34  F10.6 deg     DEdeg     Declination at Eq=J2000, Ep=J2000 (2)
      36- 47  A12   ---     Tycho-2   Designation in the Tycho-2 Catalog I/259
      49- 51  I3    mas     e_RAdeg   Mean error on RAdeg*cos(DEdeg) at Epoch
      53- 55  I3    mas     e_DEdeg   Mean error on DEdeg at Epoch
      57- 62  F6.1  yr      Epoch     Mean epoch of observation (2)
      64- 68  I5    mas/yr  pmRA      Proper motion in RA (relative to YS4.0)
      70- 74  I5    mas/yr  pmDE      Proper motion in DE (relative to YS4.0)
          76  I1    0.1     muPr      ? Total Proper Motion probability (7)
      78- 80  I3    mas/yr  e_pmRA    Mean error on pmRA
      82- 84  I3    mas/yr  e_pmDE    Mean error on pmDE
          86  I1    100mas  fit_RA    Mean error on RA fit
          88  I1    100mas  fit_DE    Mean error on DE fit
          90  I1    ---     Ndet      [0,5] Number of detections (7)
      92- 94  A3    ---     Flags     [MsY.] Flags on object (3)
      96-100  F5.2  mag     B1mag     ? First blue magnitude
         102  I1    ---     B1C       ? source of photometric calibration (4)
         104  I1    ---     B1S       ? Survey number (see "Surveys" section below)
     106-108  I3    ---     B1f       ? Field number in survey
     110-111  I2    ---     B1s/g     ? Star-galaxy separation (6)
     113-118  F6.2  arcsec  B1xi      ? Residual in X direction (5)
     120-125  F6.2  arcsec  B1eta     ? Residual in Y direction (5)
     127-131  F5.2  mag     R1mag     ? First red magnitude
         133  I1    ---     R1C       ? source of photometric calibration (4)
         135  I1    ---     R1S       ? Survey number (see "Surveys" section below)
     137-139  I3    ---     R1f       ? Field number in survey
     141-142  I2    ---     R1s/g     ? Star-galaxy separation (6)
     144-149  F6.2  arcsec  R1xi      ? Residual in X direction (5)
     151-156  F6.2  arcsec  R1eta     ? Residual in Y direction (5)
     158-162  F5.2  mag     B2mag     ? Second blue magnitude
         164  I1    ---     B2C       ? source of photometric calibration (4)
         166  I1    ---     B2S       ? Survey number (see "Surveys" section below)
     168-170  I3    ---     B2f       ? Field number in survey
     172-173  I2    ---     B2s/g     ? Star-galaxy separation (6)
     175-180  F6.2  arcsec  B2xi      ? Residual in X direction (5)
     182-187  F6.2  arcsec  B2eta     ? Residual in Y direction (5)
     189-193  F5.2  mag     R2mag     ? Second red magnitude
         195  I1    ---     R2C       ? source of photometric calibration (4)
         197  I1    ---     R2S       ? Survey number (see "Surveys" section below)
     199-201  I3    ---     R2f       ? Field number in survey
     203-204  I2    ---     R2s/g     ? Star-galaxy separation (6)
     206-211  F6.2  arcsec  R2xi      ? Residual in X direction (5)
     213-218  F6.2  arcsec  R2eta     ? Residual in Y direction (5)
     220-224  F5.2  mag     Imag      ? Infrared (N) magnitude
         226  I1    ---     IC        ? source of photometric calibration (4)
         228  I1    ---     IS        ? Survey number (see "Surveys" section below)
     230-232  I3    ---     If        ? Field number in survey
         234  I1    ---     Is/g      ? Star-galaxy separation (6)
     236-241  F6.2  arcsec  Ixi       ? Residual in X direction (5)
     243-248  F6.2  arcsec  Ieta      ? Residual in Y direction (5)

    Note (1): The USNO-B1.0 is arranged in zones of 0.1deg in Declination,
         with objects ordered by Right Ascension in each zone.
         The USNO-B1.0 is made of the zone number (from 0000 in South Pole
         to 1799 in North Pole), followed by a sequential number.
    Note (2): The proper motion was applied to compute the RAdeg and DEdeg
        values. Please note that the large uncertainties in the proper motions
        mean that the RAdeg and DEdeg are less accurate than the mean errors
        e_RAdeg and e_DEdeg which apply to the position at the mean Epoch.
    Note (3): . denotes the absence of any flag
         M = Existence in a proper motion catalog,
         s = object on a diffraction spike
         Y = Correlation with YS4.0 catalog (Monet, in prep.)
    Note (4): the photometric calibration is represented by a number:
        0 = bright photometric standards on the plate
        1 = faint photometric standard on the plate
        2 = faint photometric standard one plate away (on overlap plate)
        3 = faint photometric standard two plate away (on overlap of overlap)
        etc
    Note (5): Distance, along the x- and y- direction, of the object position
        compared to the mean epoch.
    Note (6): The star/galaxy separation is a measure of the similarity
        of the point-spread function to a stellar profile:
         0 means quite dissimilar -- i.e. a non-stellar object
        11 means quite similar -- i.e. a stellar object
    Note (7): For Tycho-2 stars, the Total Proper Motion probability is
        not given, and the number of detections Ndet is set to zero.
        For other stars, Ndet is 2 or more.

    Surveys used for USNO-B1.0:
        --------------------------------------------------
        #   Name    Emuls  Wavelen.   Zones  Fld  Dates
                             (nm)                  Obs.
        --------------------------------------------------
        0 = POSS-I  103a-O  350-500 -30..+90 936 1949-1965
        1 = POSS-I  103a-E  620-670 -30..+90 936 1949-1965
        2 = POSS-II IIIa-J  385-540 +00..+87 897 1985-2000
        3 = POSS-II IIIa-F  610-690 +00..+87 897 1985-1999
        4 = SERC-J  IIIa-J  385-540 -90..-05 606 1978-1990
        5 = ESO-R   IIIa-F  630-690 -90..-05 624 1974-1994
        6 = AAO-R   IIIa-F  590-690 -90..-20 606 1985-1998
        7 = POSS-II IV-N    730-900 +05..+87 800 1989-2000
        8 = SERC-I  IV-N    715-900 -90..+00 892 1978-2002
        9 = SERC-I* IV-N    715-900 +05..+20  25 1981-2002
        --------------------------------------------------

    Acknowledgements:
       Stephen Levine and Dave Monet, USNO Flagstaff.

    History:
      * 14-Nov-2002: Set of files compressed at CDS
      * 17-Nov-2005: Change in the format of (xi, eta) values, which was
           originally given in units of 10mas; it is now given in arcsec.
      * 26-Aug-2024: format migration (CDS)
    ================================================================================
    (End)                                   Francois Ochsenbein [CDS]    14-Nov-2002