ACDS V10.0 - Sat Apr 27 06:40:53 CEST 2019
|  | 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          250      100   Sample of data (around 0+0)
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
   Bytes Format Units   Label     Explanations
   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 DE (relative to YS4.0)
      77  I1    0.1     muPr      ? Total Proper Motion probability (7)
  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      [0,5] Number of detections (7)
  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)
 115-120  F6.2  arcsec  B1xi      ? Residual in X direction (5)
 121-126  F6.2  arcsec  B1eta     ? Residual in Y direction (5)
 129-133  F5.2  mag     R1mag     ? First red magnitude
     135  I1    ---     R1C       ? source of photometric calibration (4)
     137  I1    ---     R1S       ? Survey number (see "Surveys" section below)
     138  A1    ---     ---       [-]
 139-141  I3    ---     R1f       ? Field number in survey
 143-144  I2    ---     R1s/g     ? Star-galaxy separation (6)
 146-151  F6.2  arcsec  R1xi      ? Residual in X direction (5)
 152-157  F6.2  arcsec  R1eta     ? Residual in Y direction (5)
 160-164  F5.2  mag     B2mag     ? Second blue magnitude
     166  I1    ---     B2C       ? source of photometric calibration (4)
     168  I1    ---     B2S       ? Survey number (see "Surveys" section below)
     169  A1    ---     ---       [-]
 170-172  I3    ---     B2f       ? Field number in survey
 174-175  I2    ---     B2s/g     ? Star-galaxy separation (6)
 177-182  F6.2  arcsec  B2xi      ? Residual in X direction (5)
 183-188  F6.2  arcsec  B2eta     ? Residual in Y direction (5)
 191-195  F5.2  mag     R2mag     ? Second red magnitude
     197  I1    ---     R2C       ? source of photometric calibration (4)
     199  I1    ---     R2S       ? Survey number (see "Surveys" section below)
     200  A1    ---     ---       [-]
 201-203  I3    ---     R2f       ? Field number in survey
 205-206  I2    ---     R2s/g     ? Star-galaxy separation (6)
 208-213  F6.2  arcsec  R2xi      ? Residual in X direction (5)
 214-219  F6.2  arcsec  R2eta     ? Residual in Y direction (5)
 222-226  F5.2  mag     Imag      ? Infrared (N) magnitude
     228  I1    ---     IC        ? source of photometric calibration (4)
     230  I1    ---     IS        ? Survey number (see "Surveys" section below)
     231  A1    ---     ---       [-]
 232-234  I3    ---     If        ? Field number in survey
 236-237  I2    ---     Is/g      ? Star-galaxy separation (6)
 239-244  F6.2  arcsec  Ixi       ? Residual in X direction (5)
 245-250  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.
================================================================================
(End)                                   Francois Ochsenbein [CDS]    14-Nov-2002