The Washington Double Star Supplemental Catalog

(v 2017.06.15)


The Washington Double Star Supplemental Catalog (WDSS) is a database intended for large, faint duplicity surveys. This initial version only contains the 105,000-pair SDSS survey by Dhital et al. (2015 AJ 150, 57) and a couple other surveys, with additional matches of some pairs against 2MASS and other catalogs. However, it is expected to grow significantly as future data releases from Gaia, PanStarrs, etc. lead to ever-larger-scale duplicity surveys.

The WDSS is also meant to be a means of testing possible new formats for the main WDS database, so the format of this catalog must be considered preliminary. The increasing number of pairs in the WDS have occasionally exposed the limitations of its current format. In particular, the WDS designation, based on arcminute-precise coordinates, has insufficient precision to give unique designations to pairs discovered in crowded fields. WDS summary lines also have insufficient space for cross-reference names for the primary, and no space for coordinates or other names for the secondary. Space is also limited for component designations, magnitudes, spectral types, and proper motions.

The initial format for the WDSS attempts to address some of these shortcomings:

  1. the system designation has been expanded from 10 to 14 characters, and is now based on the arcsecond-precise coordinates of the primary. This format is common to many other contemporary catalogs.
  2. The component field now accepts designations up to seven characters in length (e.g., the designation "Aa1,Aa2" used for a very close pair in a higher-order hierarchical systems), as opposed to the five-character limit in the WDS.
  3. Both visual and infrared magnitudes are included (with flags for data taken with filters other than the default V and K).
  4. Space has been expanded for spectral types of each component, as well as proper motions.
  5. A column has been added for parallax
  6. More space is available for alternate names for both components
  7. Space is given for precise coordinates of the secondary.

In order to accomodate this additional information, the summary line has been split into two lines. (Note that this applies only to the plain-text version of the database. An SQL-type database - not yet implemented - could of course continue to use a single summary line per pair.) An example of the WDSS format is given below. The layout is similar to that of the WDS (especially measurement lines, which are virtually identical other than the WDS-vs-WDSS designation). Detailed formats for both summary and measurements lines are given in the file wdss_format.txt. The final three columns (as-yet unused) are at present reserved for any pairs found to be common to both the WDSS and the WDS. Eventually they will give a cross-reference between the new- and old-format WDS catalogs.

This format is by NO means "written in stone"! Suggestions for improvement are welcome from all users of the USNO double star catalogs.

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wdss..........  comp1.. frst nnn th1 rho1..* vmag1* kmag1* spec1 pm1............. par1... name1................... ** coords1........... wds....... dd.....comp.
wdss..........  comp2.. last     th2 rho2..* vmag2* kmag2* spec2 pm2............. par2... name2...................    coords2...........                        
wdss.......... comps... date...... *the.... dthe.. *rho...... *dsep... *mag1..*dmag. *mag2..*dmag. filt....* tel..* nn ref..... te 
...
----------------------------------------------------------------------------------------------------------------------------------------------------------------
0000004+054750 A        2008   1  25  13.17  20.87g   .    K7         .       .       .   SLW 0000+0547             V 000000.44+054750.7 
0000004+054750 B        2008      25  13.17  22.08g   .    M1         .       .       .                               000000.82+054802.6                        
0000004+054750  AB      2008.8151    25.      .      13.17      .       26.285 0.449  24.040 0.985  355 120    2.5   1 Dhi2015  Es                        
0000004+054750  AB      2008.8151      .      .        .        .       20.868 0.038  22.083 0.103  477 280    2.5   1 Dhi2015  Es                        
0000004+054750  AB      2008.8151      .      .        .        .       19.479 0.017  20.531 0.038  623 280    2.5   1 Dhi2015  Es                        
0000004+054750  AB      2008.8151      .      .        .        .       18.844 0.017  19.688 0.033  762 300    2.5   1 Dhi2015  Es                        
0000004+054750  AB      2008.8151      .      .        .        .       18.447 0.037  19.120 0.065  913 240    2.5   1 Dhi2015  Es                        
0000010+151505 A        1998   2 211   4.13  20.09g 14.63  M1         .       .       .   SLW 0000+1515             V 000001.06+151505.1                        
0000010+151505 B        2000     212   4.08  16.54g 13.46  K2    +0031.  +0018.       .   2MASS J00000091+1515015     000000.92+151501.7                        
0000010+151505  AB      1998.883    211.0     .       4.126     .       14.524  .     13.979  .    1256 245    1.3   1 TMA2003  E2                        
0000010+151505  AB      1998.883       .      .        .        .       14.923 0.170  13.528 0.035 1633 160    1.3   1 TMA2003  E2                        
0000010+151505  AB      1998.883       .      .        .        .       14.627 0.093  13.456 0.046 2210 300    1.3   1 TMA2003  E2                        
0000010+151505  AB      2000.7388   212.      .       4.08      .       22.554 0.255  18.720 0.018  355 120    2.5   1 Dhi2015  Es                        
0000010+151505  AB      2000.7388      .      .        .        .       20.092 0.017  16.539 0.004  477 280    2.5   1 Dhi2015  Es                        
0000010+151505  AB      2000.7388      .      .        .        .       18.271 0.008  15.635 0.005  623 280    2.5   1 Dhi2015  Es                        
0000010+151505  AB      2000.7388      .      .        .        .       17.410 0.007  15.314 0.005  762 300    2.5   1 Dhi2015  Es                        
0000010+151505  AB      2000.7388      .      .        .        .       16.952 0.013  15.147 0.006  913 240    2.5   1 Dhi2015  Es                        
0003431-075506 A        2009   1  61   9.67  21.21g 15.21  M2         .       .       .   SLW 0003-0755             V 000343.16-075506.1                        
0003431-075506 B        2009      61   9.67  21.48g 15.83  M2         .       .       .   2MASS J00034378-0755014     000343.74-075501.5                        
0003431-075506  AB      2009.7897    61.      .       9.67      .       22.374 0.457  22.927 0.731  355 120    2.5   1 Dhi2015  Es                        
0003431-075506  AB      2009.7897      .      .        .        .       21.206 0.048  21.480 0.061  477 280    2.5   1 Dhi2015  Es                        
0003431-075506  AB      2009.7897      .      .        .        .       19.865 0.024  20.040 0.027  623 280    2.5   1 Dhi2015  Es                        
0003431-075506  AB      2009.7897      .      .        .        .       18.648 0.013  18.829 0.014  762 300    2.5   1 Dhi2015  Es                        
0003431-075506  AB      2009.7897      .      .        .        .       18.092 0.028  18.207 0.031  913 240    2.5   1 Dhi2015  Es                        
0003431-075506 A        2009   1  92  10.08  21.21g 15.21  M2         .       .       .   SLW 0003-0755             V 000343.16-075506.1                        
0003431-075506 C        2009      92  10.08  21.52g 15.56  M2         .       .       .   2MASS J00034383-0755065     000343.84-075506.4                        
0003431-075506  AC      2009.7897    92.      .      10.08      .       22.374 0.457  26.031 0.908  355 120    2.5   1 Dhi2015  Es                        
0003431-075506  AC      2009.7897      .      .        .        .       21.206 0.048  21.521 0.063  477 280    2.5   1 Dhi2015  Es                        
0003431-075506  AC      2009.7897      .      .        .        .       19.865 0.024  19.862 0.024  623 280    2.5   1 Dhi2015  Es                        
0003431-075506  AC      2009.7897      .      .        .        .       18.648 0.013  18.667 0.013  762 300    2.5   1 Dhi2015  Es                        
0003431-075506  AC      2009.7897      .      .        .        .       18.092 0.028  18.106 0.028  913 240    2.5   1 Dhi2015  Es                        
0003431-075506 B        2009   1 163   5.16  21.48g 15.83  M2         .       .       .   2MASS J00034378-0755014     000343.74-075501.5                        
0003431-075506 C        2009     163   5.16  21.52g 15.56  M2         .       .       .   2MASS J00034383-0755065     000343.84-075506.4                        
0003431-075506  BC      2009.7897   163.      .       5.16      .       22.927 0.731  26.031 0.908  355 120    2.5   1 Dhi2015  Es                        
0003431-075506  BC      2009.7897      .      .        .        .       21.480 0.061  21.521 0.063  477 280    2.5   1 Dhi2015  Es                        
0003431-075506  BC      2009.7897      .      .        .        .       20.040 0.027  19.862 0.024  623 280    2.5   1 Dhi2015  Es                        
0003431-075506  BC      2009.7897      .      .        .        .       18.829 0.014  18.667 0.013  762 300    2.5   1 Dhi2015  Es                        
0003431-075506  BC      2009.7897      .      .        .        .       18.207 0.031  18.106 0.028  913 240    2.5   1 Dhi2015  Es                        
The database is presently divided into 4 six-hour RA bands (wdss1.dat, ... wdss4.dat). It will undoubtedly have to be further divided into smaller bands (as in the WDS) as it grows in size. A summary file (wdss_summ.txt) is also available.