Here are RA/Dec coordinates for the Pigulski & Kolaczkowski stars in Cygnus OB2. The order of the list should be identical to that of "table4.dat" from the 'cdsarc' ftp site. Using my lists of coordinates for the Reddish stars and for Massey & Johnson (MT91), I identified 19 stars to use as the reference net. Nearly all the positions for these stars come from the GSC v1.2. Since the field lies near the center of the relevant POSS-I plate, these should be quite reliable for adjustment to the FK5/J2000/ICRS system to within a few tenths of an arcsecond. A simple quadratic fit yielded rms residuals for these stars of only 0".1 --- two stars rejected from the solution had residuals of just 0".7 and 0".3. If you make a comparison against ACT/TRC/AC2000, you can see that the external errors cannot be in excess of 0".5. I would recommend rounding the positions below to 0".1 precision (i.e. 0s.01 in RA and 0".1 in Dec), since the extra decimal is really unjustified. In the 'Name' column I have given the MT or 'MTE' numbers except for the first several, which come from Schulte (S) or Reddish et al. (R). ------------------------------------------------------------------------------- Coordinates for stars in Cygnus OB2 version: 1 Sep 1998 source: 1998MNRAS.298..753P PIGULSKI A. and KOLACZKOWSKI Z. Mon. Not. R. Astron. Soc., 298, 753-762 (1998) Mapping the {beta} Cephei instability strip: photometric variability of stars in the central part of the Cygnus OB2 association. Dictionary: <[MT91] NNN> (Nos 800-975) added, <[MT91] NNNA> N=6. Name RA (J2000) Dec S 45 20 33 5.441 +41 13 9.83 S 52 20 33 11.261 +41 12 40.75 S 53 20 33 11.483 +41 12 40.93 S 55 20 33 3.910 +41 17 36.72 S 57 20 33 8.734 +41 18 51.62 S 59 20 33 8.675 +41 18 8.01 R 463 20 33 6.838 +41 23 36.13 R 663 20 33 1.286 +41 16 0.27 R 694 20 33 8.632 +41 18 31.36 R 858 20 33 6.197 +41 12 54.22 387 20 33 2.339 +41 22 8.73 389 20 33 2.947 +41 15 22.58 390 20 33 2.922 +41 17 43.18 392 20 33 3.178 +41 21 34.56 395 20 33 4.422 +41 17 8.97 399 20 33 4.793 +41 13 39.13 400 20 33 5.198 +41 17 51.32 401 20 33 5.097 +41 22 45.51 405 20 33 6.142 +41 18 36.84 409 20 33 6.618 +41 21 13.27 416 20 33 8.051 +41 23 34.22 4417A 20 33 8.766 +41 13 18.43 4417B 20 33 8.846 +41 13 17.13 418 20 33 9.158 +41 13 43.16 420 20 33 9.453 +41 12 58.16 421 20 33 9.604 +41 13 0.40 422 20 33 9.761 +41 13 41.36 425 20 33 10.125 +41 13 9.93 426 20 33 10.388 +41 13 5.73 427 20 33 10.291 +41 23 44.75 428 20 33 10.459 +41 20 57.46 429 20 33 10.505 +41 22 22.55 431 20 33 10.738 +41 15 8.20 433 20 33 10.846 +41 13 39.68 436 20 33 11.096 +41 14 45.61 4437A 20 33 11.132 +41 19 10.10 4437B 20 33 11.057 +41 19 8.39 441 20 33 11.379 +41 17 58.63 448 20 33 13.265 +41 13 28.50 450 20 33 13.231 +41 19 6.52 452 20 33 13.268 +41 21 31.17 455 20 33 13.691 +41 13 5.60 456 20 33 13.905 +41 22 36.98 457 20 33 14.099 +41 20 21.99 458 20 33 14.183 +41 17 30.86 459 20 33 14.337 +41 19 33.27 460 20 33 14.432 +41 19 23.90 462 20 33 14.758 +41 18 41.90 463 20 33 14.851 +41 19 34.77 464 20 33 15.017 +41 17 21.17 465 20 33 15.075 +41 18 50.68 466 20 33 15.390 +41 19 12.92 468 20 33 15.627 +41 16 33.27 470 20 33 15.701 +41 20 17.23 471 20 33 15.984 +41 12 53.50 472 20 33 16.321 +41 13 15.39 473 20 33 16.337 +41 19 1.99 476 20 33 16.969 +41 23 23.56 477 20 33 17.411 +41 12 38.56 478 20 33 17.409 +41 14 54.02 480 20 33 17.482 +41 17 9.41 483 20 33 17.981 +41 18 31.32 484 20 33 18.079 +41 19 8.85 485 20 33 18.022 +41 21 36.71 486 20 33 18.207 +41 19 51.39 487 20 33 18.282 +41 17 39.54 488 20 33 18.533 +41 15 35.14 489 20 33 18.433 +41 23 12.44 492 20 33 19.143 +41 17 45.06 494 20 33 19.342 +41 17 9.16 496 20 33 19.594 +41 19 6.51 497 20 33 19.955 +41 13 40.77 502 20 33 20.401 +41 18 41.34 503 20 33 20.425 +41 20 33.47 504 20 33 20.509 +41 17 20.83 505 20 33 20.783 +41 14 16.55 506 20 33 20.890 +41 18 1.44 507 20 33 21.018 +41 17 40.18 508 20 33 21.259 +41 18 39.66 510 20 33 21.561 +41 23 18.15 512 20 33 22.207 +41 15 12.27 513 20 33 22.431 +41 22 17.02 515 20 33 23.241 +41 13 41.93 517 20 33 23.326 +41 20 17.30 519 20 33 23.909 +41 23 15.42 520 20 33 24.336 +41 17 51.47 521 20 33 24.545 +41 18 35.03 522 20 33 24.720 +41 22 4.52 525 20 33 25.125 +41 18 18.82 528 20 33 25.639 +41 15 24.79 529 20 33 25.596 +41 19 26.29 532 20 33 26.087 +41 15 49.82 533 20 33 26.104 +41 22 38.06 535 20 33 27.202 +41 15 11.62 538 20 33 27.444 +41 16 46.37 540 20 33 27.767 +41 13 27.65 543 20 33 28.223 +41 18 19.59 548 20 33 29.467 +41 20 34.58 553 20 33 30.532 +41 19 0.93 5554A 20 33 30.525 +41 20 17.79 5554B 20 33 30.461 +41 20 16.53 556 20 33 30.799 +41 15 22.73 559 20 33 30.761 +41 22 0.85 561 20 33 31.616 +41 21 46.03 564 20 33 32.736 +41 15 29.87 569 20 33 33.422 +41 18 8.87 574 20 33 34.031 +41 18 43.50 575 20 33 34.335 +41 18 11.33 588 20 33 36.990 +41 16 11.23 590 20 33 37.519 +41 16 25.44 596 20 33 38.391 +41 16 19.93 600 20 33 38.830 +41 17 14.81 800 20 33 9.609 +41 12 27.87 801 20 33 9.360 +41 12 36.64 802 20 33 20.601 +41 12 49.35 803 20 33 21.304 +41 12 50.53 804 20 33 12.354 +41 12 53.36 805 20 33 9.206 +41 12 53.47 806 20 33 12.503 +41 12 56.85 807 20 33 9.423 +41 12 56.34 808 20 33 6.076 +41 12 56.70 809 20 33 10.290 +41 12 58.62 810 20 33 17.170 +41 13 0.68 811 20 33 32.855 +41 13 4.79 812 20 33 11.771 +41 13 2.37 813 20 33 17.757 +41 13 4.52 814 20 33 9.787 +41 13 3.70 815 20 33 32.585 +41 13 9.48 816 20 33 5.292 +41 13 3.46 817 20 33 13.119 +41 13 5.71 818 20 33 20.503 +41 13 21.04 819 20 33 30.920 +41 13 23.69 820 20 33 10.572 +41 13 19.88 821 20 33 21.183 +41 13 25.59 822 20 33 17.963 +41 13 25.25 823 20 33 7.929 +41 13 26.68 824 20 33 21.831 +41 13 32.38 825 20 33 29.496 +41 13 36.45 826 20 33 24.046 +41 13 39.36 827 20 33 4.592 +41 13 39.89 828 20 33 7.546 +41 13 41.50 829 20 33 30.374 +41 14 6.35 830 20 33 6.334 +41 14 6.96 831 20 33 18.271 +41 14 11.38 832 20 33 23.499 +41 14 13.44 833 20 33 17.345 +41 14 22.56 834 20 33 18.042 +41 14 24.42 835 20 33 9.356 +41 14 28.89 836 20 33 1.757 +41 14 27.57 837 20 33 30.923 +41 14 36.66 838 20 33 8.273 +41 14 35.27 839 20 33 5.170 +41 14 38.83 840 20 33 16.878 +41 14 44.00 841 20 33 15.871 +41 14 48.08 842 20 33 14.157 +41 14 50.36 843 20 33 12.520 +41 15 2.06 844 20 33 1.599 +41 15 4.70 845 20 33 30.489 +41 15 13.01 846 20 33 12.693 +41 15 10.68 847 20 33 24.549 +41 15 34.18 848 20 33 10.371 +41 15 32.17 849 20 33 8.325 +41 15 43.21 850 20 33 7.696 +41 15 44.37 851 20 33 18.647 +41 16 6.67 852 20 33 20.358 +41 16 12.34 853 20 33 4.879 +41 16 13.13 854 20 33 12.838 +41 16 22.39 855 20 33 8.664 +41 16 22.01 856 20 33 17.015 +41 16 33.28 857 20 33 9.026 +41 16 39.70 858 20 33 27.950 +41 16 46.24 859 20 33 6.044 +41 16 43.68 860 20 33 12.655 +41 16 46.15 861 20 33 19.720 +41 16 48.27 862 20 33 27.370 +41 16 50.61 863 20 33 28.160 +41 16 52.99 864 20 33 16.726 +41 16 51.38 865 20 33 19.178 +41 16 52.71 866 20 33 19.127 +41 16 59.59 867 20 33 16.581 +41 17 4.06 868 20 33 27.205 +41 17 10.74 869 20 33 20.384 +41 17 13.73 870 20 33 11.433 +41 17 13.80 871 20 33 16.000 +41 17 27.29 872 20 33 17.520 +41 17 27.77 873 20 33 28.361 +41 17 31.60 874 20 33 18.107 +41 17 31.60 875 20 33 11.955 +41 17 35.16 876 20 33 22.243 +41 17 44.72 877 20 33 12.382 +41 17 50.23 878 20 33 15.905 +41 17 51.50 879 20 33 7.570 +41 17 50.20 880 20 33 22.041 +41 17 57.76 881 20 33 21.295 +41 18 2.03 882 20 33 4.645 +41 17 59.70 883 20 33 8.065 +41 18 1.66 884 20 33 24.164 +41 18 15.28 885 20 33 24.354 +41 18 18.08 886 20 33 17.906 +41 18 21.03 887 20 33 30.452 +41 18 25.11 888 20 33 22.217 +41 18 26.42 889 20 33 11.796 +41 18 25.41 890 20 33 17.128 +41 18 27.55 891 20 33 2.212 +41 18 28.49 892 20 33 2.395 +41 18 28.73 893 20 33 16.084 +41 18 33.44 894 20 33 20.713 +41 18 46.61 895 20 33 31.752 +41 18 53.07 896 20 33 2.252 +41 18 49.11 897 20 33 14.459 +41 18 56.98 898 20 33 20.474 +41 18 59.07 899 20 33 16.144 +41 19 4.52 900 20 33 8.591 +41 19 15.44 901 20 33 18.001 +41 19 18.10 902 20 33 17.190 +41 19 21.60 903 20 33 18.658 +41 19 23.45 904 20 33 5.420 +41 19 32.03 905 20 33 21.092 +41 19 53.44 906 20 33 27.224 +41 20 9.10 907 20 33 15.434 +41 20 17.55 908 20 33 12.030 +41 20 23.64 909 20 33 15.885 +41 20 25.67 910 20 33 11.041 +41 20 30.67 911 20 33 25.475 +41 20 39.13 912 20 33 23.429 +41 20 39.79 913 20 33 16.554 +41 20 39.34 914 20 33 31.755 +41 20 47.48 915 20 33 22.445 +41 20 52.71 916 20 33 31.420 +41 20 57.73 917 20 33 17.850 +41 20 59.93 918 20 33 19.915 +41 21 6.72 919 20 33 15.485 +41 21 11.84 920 20 33 3.061 +41 21 13.18 921 20 33 22.844 +41 21 20.91 922 20 33 32.134 +41 21 23.55 923 20 33 16.995 +41 21 21.20 924 20 33 17.439 +41 21 24.25 925 20 33 30.336 +41 21 31.47 926 20 33 17.006 +41 21 30.59 927 20 33 30.457 +41 21 35.32 928 20 33 15.568 +41 21 33.58 929 20 33 19.047 +41 21 35.26 930 20 33 13.474 +41 21 34.29 931 20 33 17.249 +41 21 37.47 932 20 33 25.041 +41 21 46.82 933 20 33 23.627 +41 21 51.38 934 20 33 25.361 +41 21 57.59 935 20 33 4.312 +41 21 54.86 936 20 33 19.996 +41 22 6.45 937 20 33 10.297 +41 22 5.54 938 20 33 15.630 +41 22 10.15 939 20 33 8.904 +41 22 8.97 940 20 33 13.838 +41 22 15.37 941 20 33 25.490 +41 22 21.59 942 20 33 22.688 +41 22 28.72 943 20 33 27.536 +41 22 39.19 944 20 33 15.452 +41 22 37.78 945 20 33 2.944 +41 22 36.30 946 20 33 11.241 +41 22 42.57 947 20 33 22.244 +41 22 50.15 948 20 33 14.031 +41 22 49.97 949 20 33 26.721 +41 22 53.65 950 20 33 22.738 +41 22 53.26 951 20 33 16.906 +41 22 53.82 952 20 33 29.619 +41 23 0.86 953 20 33 7.120 +41 22 59.51 954 20 33 25.941 +41 23 4.11 955 20 33 14.677 +41 23 4.51 956 20 33 1.157 +41 23 1.49 957 20 33 16.478 +41 23 9.43 958 20 33 11.977 +41 23 8.78 959 20 33 4.687 +41 23 19.16 960 20 33 15.586 +41 23 23.75 961 20 33 5.115 +41 23 25.33 962 20 33 7.649 +41 23 26.49 963 20 33 11.662 +41 23 32.49 964 20 33 28.955 +41 23 36.69 965 20 33 32.744 +41 23 43.64 966 20 33 4.289 +41 23 37.29 967 20 33 21.815 +41 23 52.69 968 20 33 23.531 +41 23 59.39 969 20 33 35.230 +41 17 25.77 970 20 33 35.408 +41 16 58.45 971 20 33 40.174 +41 16 39.24 972 20 33 39.673 +41 17 6.67 973 20 33 5.278 +41 21 39.31 974 20 33 18.805 +41 22 13.57 975 20 33 20.196 +41 22 43.18