ADC/CDS Standard Document for Catalog:
/catalogs/2/2108/

1. Use the ADC Data Viewer Suite to visualize the data.
2. Get the data files via anonymous FTP. (See Note.)

II/108      Two-Micron Sky Survey, Nearest SAO Stars on POSS         (Nagy 1983)
================================================================================
The Two-Micron Sky Survey: Nearest SAO Star and Locations on Palomar Sky Survey
    Prints
    Nagy T.A., Hill R.S., Mead J.M.
    <ADC Bull. 1, 183 (1983)>
    =1983ADCBu...1.....M
================================================================================
ADC_Keywords: Surveys

Description:
   This catalog is a list of potential guide stars developed for a program to
   obtain more precise positions of objects in the IRC Two-Micron Sky Survey of
   Neguebauer and Leighton (1969).  For each IRC source (col. 1), it gives:
   (col. 2) the identification of the star in the SAO catalog which is nearest,
   (col. 3) the great circle arc distance (in seconds) between the SAO star and
   the IRC source, (col. 4) the position angle (in degrees) of the IRC source
   relative to the SAO star, (col. 5) the plate number(s) of the POSS on which
   the IRC source appears, (col. 6,7) the approximate rectangular coordinates
   (in mm) of the IRC source on the POSS print area with respect to the
   Southwest corner, and (col. 8) the modified Luyten Palomar number.  The POSS
   plate numbers given are for the red plates.

File Summary:
--------------------------------------------------------------------------------
 FileName     Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe           80        .   This file
data.dat         49     6817   Catalog Data
--------------------------------------------------------------------------------

Byte-by-byte Description of file: data.dat
--------------------------------------------------------------------------------
   Bytes Format  Units   Label  Explanations
--------------------------------------------------------------------------------
   3-  8  I6     ---     ID     ? IRC Number from Two-Micron Sky Survey
  11- 16  I6     ---     SAO   *? ID of Closest SAO Star to IRC Source
  19- 22  I4     arcsec  D     *? Great Circle Arc Distance between SAO and IRC
  25- 27  I3     deg     PA    *?=0 Position Angle of IRC Relative to SAO Source
  30- 33  A4     ---     POSS  *POSS Plate ID
  36- 38  I3     mm      X     *Rectangular Coordinate on POSS Print Area
  41- 43  I3     mm      Y      Rectangular Coordinate on POSS Print Area
  47- 49  I3     ---     MLP   *Modified Luyten Palomar Number
--------------------------------------------------------------------------------
Note on SAO:
        This datum is from the MATCH output data file.
Note on D:
        The published positions from the individual source catalogues are
        the data inputs to the MATCH program. Proper motion effects are
        not incorporated into the MATCH program.
Note on PA:
        The angle is measured from North through East according to the
        standard convention. This quantity was computed from the published
        Epoch 1950.0 source positions.
Note on POSS:
        The POSS plate ID for the plate area on which the IRC object 
        appears. The plate IDs include the Palomar (Arabic numeral 
        preceded by the letter S) and Whiteoak (IDs from 7000-9999) 
        Southern Extensions. If an object appears on more than one POSS
        print area, a multiple listing is given for each print area on
        which the given object appears.
        The POSS Designations in this table are for the red plates. There
        are four different blue and red numbers as given below:
                POSS-E          POSS-O          MLP
                 9              10              465
                14              15              469
                15              16              472
                11              12              473
Note on X:
        The values are measured with respect to the Southwest corner of
        the print area. The center of the print area is:
                X = 172.5
                Y = 173.5
Note on MLP:
        This number represents a sequential numbering of the POSS plus 
        Whiteoak plate areas (range 1-1037). The overall sequence is
        from North to South; within each declination band it is by 
        increasing Right Ascension. Therefore, plate 1 is at the North 
        Pole and plate 1037 is at the Southern limit of the Whiteoak
        extension. This numbering scheme also takes into account the
        nearly duplicate POSS plate areas (895 and 1619) which correspond
        to MLP numbers 723 and 724 respectively. Since the two plate
        centers are almost identical, when a source is assigned to one
        of the plates, typically it is assigned to both.
--------------------------------------------------------------------------------  
References:
   Haramundus K.L. 1966, Smithsonian Astrophysical Observatory Star Catalog
      (SAO), Smithsonian Institution, Washington, D.C., Smithsonian
      Publication 4652.
   Neugebauer G. and Leighton R.B. 1969, Two-Micron Sky Survey, NASA
      SP-3047
================================================================================
(End)                                  Julie Anne Watko [SSDOO/ADC]  03-Nov-1995