I/284               The USNO-B1.0 Catalog     (Monet+ 2003)
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The USNO-B Catalog
     Monet D.G., Levine S.E., Casian B., et al.
    <Astron. J. 2003 (in press)>
    =2003AJ...(in.press)M
================================================================================
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:
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 FileName  Lrecl    Records    Explanations
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ReadMe        80          .    This file
out.sam      230        214    Sample of data (around 0+0)
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See also:
    http://www.nofs.navy.mil/data/fchpix/ : 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
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   Bytes Format Units   Label     Explanations
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   1- 12  A12   ---    USNO-B1.0  Designation of the object (1)
  14- 25  A12   ---     Tycho-2   Designation in the Tycho-2 Catalog <I/259>
  27- 36  F10.6 deg     RAdeg     Right Ascension at Eq=J2000, Ep=J2000 (2)
  37- 46  F10.6 deg     DEdeg     Declination at Eq=J2000, Ep=J2000 (2)
  48- 50  I3    mas   e_RAdeg     Mean error on RAdeg*cos(DEdeg) at Epoch
  52- 54  I3    mas   e_DEdeg     Mean error on DEdeg at Epoch
  56- 61  F6.1  yr      Epoch     Mean epoch of observation (2)
  63- 68  I6    mas/yr  pmRA      Proper motion in RA (relative to YS4.0)
  70- 75  I6    mas/yr  pmDE      Proper motion in RA
      77  I1    0.1     muPr      Total Proper Motion probability
  79- 81  I3    mas/yr  e_pmRA    Mean error on pmRA
  83- 85  I3    mas/yr  e_pmDE    Mean error on pmDE
      87  I1    100mas  fit_RA    Mean error on RA fit
      89  I1    100mas  fit_DE    Mean error on DE fit
      91  I1    ---     Ndet      [2,5] Number of detections
  93- 95  A3    ---     Flags     [MsY.] Flags on object (3)
  98-102  F5.2  mag     B1mag     ? First blue magnitude
     104  I1    ---     B1C       ? source of photometric calibration (4)
     106  I1    ---     B1S       ? Survey number (see "Surveys" section below)
     107  A1    ---     ---       [-]
 108-110  I3    ---     B1f       ? Field number in survey
 112-113  I2    ---     B1s/g     ? Star-galaxy separation (6)
 115-118  I4    mas     B1xi      ? Residual in X direction (5)
 119-122  I4    mas     B1eta     ? Residual in Y direction (5)
 125-129  F5.2  mag     R1mag     ? First red magnitude
     131  I1    ---     R1C       ? source of photometric calibration (4)
     133  I1    ---     R1S       ? Survey number (see "Surveys" section below)
     134  A1    ---     ---       [-]
 135-137  I3    ---     R1f       ? Field number in survey
 139-140  I2    ---     R1s/g     ? Star-galaxy separation (6)
 142-145  I4    mas     R1xi      ? Residual in X direction (5)
 146-149  I4    mas     R1eta     ? Residual in Y direction (5)
 152-156  F5.2  mag     B2mag     ? Second blue magnitude
     158  I1    ---     B2C       ? source of photometric calibration (4)
     160  I1    ---     B2S       ? Survey number (see "Surveys" section below)
     161  A1    ---     ---       [-]
 162-164  I3    ---     B2f       ? Field number in survey
 166-167  I2    ---     B2s/g     ? Star-galaxy separation (6)
 169-172  I4    mas     B2xi      ? Residual in X direction (5)
 173-176  I4    mas     B2eta     ? Residual in Y direction (5)
 179-183  F5.2  mag     R2mag     ? Second red magnitude
     185  I1    ---     R2C       ? source of photometric calibration (4)
     187  I1    ---     R2S       ? Survey number (see "Surveys" section below)
     188  A1    ---     ---       [-]
 189-191  I3    ---     R2f       ? Field number in survey
 193-194  I2    ---     R2s/g     ? Star-galaxy separation (6)
 196-199  I4    mas     R2xi      ? Residual in X direction (5)
 200-203  I4    mas     R2eta     ? Residual in Y direction (5)
 206-210  F5.2  mag     Imag      ? Infrared (N) magnitude
     212  I1    ---     IC        ? source of photometric calibration (4)
     214  I1    ---     IS        ? Survey number (see "Surveys" section below)
     215  A1    ---     ---       [-]
 216-218  I3    ---     If        ? Field number in survey
 220-221  I2    ---     Is/g      ? Star-galaxy separation (6)
 223-226  I4    mas     Ixi       ? Residual in X direction (5)
 227-230  I4    mas     Ieta      ? Residual in Y direction (5)
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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

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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.
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(End)                                   Francois Ochsenbein [CDS]    14-Nov-2002
