NSSDC/WDC-A-R&S 84-06 DOCUMENTATION FOR THE MACHINE-READABLE VERSION OF THE AGK3 STAR CATALOGUE OF POSITIONS AND PROPER MOTIONS NORTH OF -2.5 DEGREES DECLINATION (DIECKVOSS AND COLLABORATORS 1975) Wayne H. Warren Jr. May 1984 National Space Science Data Center (NSSDC)/ World Data Center A for Rockets and Satellites (WDC-A-R&S) National Aeronautics and Space Administration Goddard Space Flight Center Greenbelt, Maryland 20771 DOCUMENTATION FOR THE MACHINE-READABLE VERSION OF THE AGK3 STAR CATALOGUE OF POSITIONS AND PROPER MOTIONS NORTH OF -2.5 DEGREES DECLINATION (DIECKVOSS AND COLLABORATORS 1975) ABSTRACT A detailed description of the machine-readable catalog as it is currently being distributed from the Astronomical Data Center is given. The version de- scribed is that originally received from the Astronomisches Rechen-Institut, Heidelberg, with a few minor corrections found when the file was examined at the Astronomical Data Center, NASA Goddard Space Flight Center. ii TABLE OF CONTENTS Section 1 - INTRODUCTION AND SOURCE REFERENCE ........................... 1-1 Section 2 - FILE CONTENTS ............................................... 2-1 Section 3 - FILE CHARACTERISTICS ........................................ 3-1 Section 4 - REMARKS, MODIFICATIONS AND REFERENCES ....................... 4-1 LIST OF TABLES Table 1 File Contents .................................................... 2-1 2 File Characteristics ............................................. 3-1 3 Numbers of AGK2 and AGK3 Stars in Each Zone ...................... 4-1 4 List of 446 AGK2 Stars Omitted from AGK3 ......................... 4-4 5 List of Three Stars New in AGK3 .................................. 4-6 6 AGK3 Stars for which Proper-Motion Data in a and/or w are Missing 4-6 7 List of 19 Stars with AGK3 Component Identifications ............. 4-7 8 AGK3 Stars with Probable Erroneous w Data ........................ 4-8 iii SECTION 1 - INTRODUCTION AND SOURCE REFERENCE The AGK3 Star Catalogue of Positions and Proper Motions North of -2.5 Degrees Declination (hereinafter AGK3) was conceived and planned during discussions between O. Heckmann and D. Brouwer at Hamburg Observatory following the 1952 International Astronomical Union (IAU) General Assembly in Rome. It was concluded that an adequate number of reference stars (AGK3R) should be observed by as many meridian circles of as many observatories as possible, the revision of FK3, then in progress (FK4), should define the reference frame, and the same instruments as used for AGK2 should be used for the observations for AGK3. A formal recommendation was adopted through Commission 8 at the 1955 IAU General Assembly in Dublin, with the observatories at Babelsberg, Bergedorf, Bordeaux, Greenwich, Heidelberg, Nikolajew, Ottawa, Paris, Pulkovo, Strasbourg and Washington (USNO) to collaborate in the work, and with F. P. Scott (USNO) to coordinate the meridian circle observations of AGK3R stars. The completion of the photographic observations was to be the responsibility of the observatories at Bergedorf and Bonn, with all plate measurements to be done at the former. (However, it was finally decided that all plates, even for the AGK2 Bonn zones, would be taken at Bergedorf.) The plates for AGK3 were secured at Bergedorf between August 1956 and June 1964, with special precautions (exposures on both sides of the pier) made to compensate for possible changes in the camera objective. The two sets of plates were measured at Bergedorf in opposite directions and averaged to obtain final x,y coordinates. The detailed procedures for the correction of magnitude-color errors, reduction of the measures using the AGK3R stars, re-reduction of AGK2 using its reference catalog AGK2A transformed to the FK4 system, and final reduction of the AGK3 positions and proper motions, are discussed by W. Dieckvoss in his technical introduction to the source reference. Although a more detailed discussion of errors is given by Dieckvoss, the standard error for one coordinate on one plate as determined from a limited sample of 110 pairs of plates is plus or minus 0.025" for AGK3. This document describes the machine-readable version of the AGK3 as it is currently being distributed by the Astronomical Data Center. It is intended to enable users to process the machine-readable file and its data without problems and guesswork. A copy of this document should be supplied with any secondary copies of the machine version originally obtained from the Astronomical Data Center. SOURCE REFERENCE Dieckvoss, W. (in collaboration with H. Kox, A. Gunther and E. Brosterhus) 1975, AGK3 Star Catalogue of Positions and Proper Motions North of -2.5 Degrees Declination, Hamburg-Bergedorf (printed with financial support from Deutsche Forschungsgemeinschaft Bonn-Bad Godesberg). 1-1 SECTION 2 - FILE CONTENTS A byte-by-byte description of the contents of the machine-readable AGK3 file is given in Table 1. The suggested format specifications apply to FORTRAN formatted read statements, but can be modified depending upon individual programming and processing requirements. Default values are given only for those fields where the primary suggested format specifications are numerical, but where data are not always present; null values are always blanks in fields for which primary suggested formats are given as character (A), except that a null value of "0" is present in multiple-system component identifications. Alternate format specifications are given in parentheses. Table 1. File Contents. AGK3 Catalogue. Suggested Default Byte(s) Units Format Value Description 1 --- A1 --- Sign of AGK3 number. 2- 3 --- I2 --- AGK3 zone. 4- 7 --- I4 --- AGK3 number in increasing order within each declination zone. The field is filled with preceding zeros. 8 --- A1 "0" Component identification when duplicate AGK3 numbers occur. The lower case letters "a" and "b" may be present. 9-11 mag F3.1 blank Photographic magnitude, mpg, taken from AGK2 and recorded as an integer. 12-13 --- A2 blank Spectral type adopted from the Henry Draper Catalogue (Cannon and Pickering 1918-1924), its Extension (Cannon 1925- 1936), Schildt (Yale Transactions) or determined by A. N. Vyssotsky and col- laborators at the Leander-McCormick Obs. 14-15 hours I2 --- Right ascension for equator and equinox 1950.0. 16-17 min I2 --- Right ascension 18-22 sec F5.3 --- Right ascension, recorded as an integer number. 23 --- A1 --- Sign of declination for equator and equinox 1950.0. 24-25 deg I2 --- Declination 26-27 arcmin I2 --- Declination 28-31 arcsec F4.2 --- Declination, written as an integer number. 2-1 Table 1 (continued) Suggested Default Byte(s) Units Format Value Description 32-33 --- I2 --- Number of photographic observations used to determine the position. Single-digit numbers are preceded by a zero. 34-37 years F4.2 --- Epoch of AGK3 position - 1900 (e.g. 1958.81 is recorded as 5881). 38 --- A1 --- Sign of annual proper motion in right ascension. 39-42 0.001" F4.3 blank Annual proper motion in right ascension multiplied by cos(delta), determined by differencing the AGK3 and AGK2 positions and dividing by the epoch difference. Proper motions are missing for stars new in AGK3 (see Table 6). If a calculated value of the proper motion exceeded the field capacity a value of "9999" is given with a "+" in byte 38. The suggested format reads the datum in the correct units. 43 --- A1 --- Sign of annual proper motion in declination. 44-47 0.001" F4.3 blank Annual proper motion in declination. See information for bytes 39-42. 48-51 years F4.2 blank Epoch difference AGK3-AGK2. 52-53 --- A2 blank 'BD' catalog designation 54 --- A1 blank Sign of zone number 55-56 --- A2 (I2) blank BD zone. 57-61 --- A5 (I5) blank BD number within zone. 62 --- A1 (I1) zero Numerical code for identification of a component of a multiple system: (1 = primary [P]; 2 = secondary [S]; 3 = A; 4 = B; 5 = S1; 6 = S2; 7 = P1; 8 = P2; 9 = C). BD supplemental stars (lower case letters) are assigned codes but are indistinguishable from A and B desig- nations because the codes are the same. Since the file format only allows one byte for the duplicity code, and nine 2-2 Table 1 (continued) Suggested Default Byte(s) Units Format Value Description codes are already used, the distinction cannot be drawn. If it is necessary to distinguish or identify supplemental stars, the Catalog of BD Supplemental Stars (Warren and Kress 1980) should be used. 63-64 --- A2 (I2) --- Sum of discrepancy codes, calculated as the sum of 2**v (2 to the power of v), where v = 0 (BD number), 1 (mpg and/or spectral type), 2 (AGK2 right ascension), 3 (AGK2 declination), 4 (AGK3 right ascension), 5 (AGK3 declination). 65 --- A1 --- Sign of right ascension proper motion following. 66-70 sec F5.4 blank Annual proper motion in right ascension, computed by dividing by 15cos(delta). 71 --- A1 --- Sign of right ascension difference. 72-76 arcsec F5.4 blank The residual quantity of the difference in right ascension (multiplied by cos(delta)) in the sense AGK3 - (AGK2modified), where the last quantity denotes data from the re-reduced AGK2. 77 --- A1 --- Sign of declination difference. 76-82 arcsec F5.4 blank The residual quantity of the difference in declination in the sense AGK3 - (AGK2modified). 2-3 SECTION 3 - FILE CHARACTERISTICS The information in Table 2 is sufficient for a user to describe the indigenous characteristics of the AGK3 Catalogue to a computer. Information easily varied from installation to installation, such as block size (physical record length), blocking factor (number of logical records per physical record), total number of blocks, tape density, number of tracks, and internal coding (EBCDIC, ASCII, etc.) is not included for tapes. These parameters should always be transmitted if secondary copies of the catalog are supplied to other users or installations. Table 2. File Characteristics. AGK3 Catalogue. NUMBER OF FILES .................................................. 1 LOGICAL RECORD LENGTH (BYTES) .................................... 82 RECORD FORMAT .................................................... Fixed TOTAL NUMBER OF LOGICAL RECORDS .................................. 183145 3-1 SECTION 4 - REMARKS, MODIFICATIONS AND REFERENCES The machine version of the AGK3 was received on magnetic tape from the Centre de Donnees Stellaires, Strasbourg in 1978. The version received had been obtained originally from the Astronomisches Rechen-Institut in Heidelberg. A preliminary document for a modified and corrected version of the catalog was produced by Nagy (1979). The following changes were made to the Heidelberg file in order to correct some minor errors and to produce a file conforming more closely to the published version: 1. AGK3 component identifications for stars where more than one AGK3 star has the same number were changed from upper case characters (A, B) to lower case (a, b) as in the printed edition. 2. Nine stars in AGK3 zone -00, but in BD zone +00 were found to have a BD zone of +90. The BD zone for these stars was changed to +00. These stars are: AGK3 -00 1467, 1510, 1530, 1531, 1532, 1602, 1693, 1774, and 2120. The tables following give information on the zone statistics of the AGK3, on stars for which proper-motion data are not included, and on stars which are omitted or new in AGK3. These tables are taken from documentation prepared by T. Lederle (1976) for distribution with the Heidelberg version of the AGK3 tape. Table 8 lists positional data for two AGK3 stars for which the declination data are suspect. These stars were pointed out by D. W. Dunham. A list of errata to AGK3 magnitudes recently published by Willstrop (1983) has not been incorporated into this version of the machine-readable catalog. Table 3. Numbers of AGK2 and AGK3 Stars in Each Zone. Number Omitted New in Number Zone in AGK2 in AGK3 AGK3 in AGK3 +89 56 2 - 54 +88 136 - - 136 +87 180 - - 180 +86 329 - - 329 +85 402 - - 402 +84 518 - - 518 +83 618 1 - 617 +82 731 - - 731 +81 739 - - 739 +80 508 1 - 507 4-1 Table 3 (continued) Number Omitted New in Number Zone in AGK2 in AGK3 AGK3 in AGK3 +79 698 1 - 697 +78 586 1 - 585 +77 700 - - 700 +76 981 - - 981 +75 1027 - - 1027 +74 704 - - 704 +73 643 1 - 642 +72 659 - - 659 +71 733 - - 733 +70 853 3 - 850 +69 1056 - - 1056 +68 1054 - - 1054 +67 1099 - - 1099 +66 1247 - - 1247 +65 1332 - - 1332 +64 1266 - - 1266 +63 1372 4 - 1368 +62 1501 5 - 1496 +61 1511 5 - 1506 +60 1626 6 - 1620 +59 1672 7 - 1665 +58 1611 3 - 1608 +57 1719 8 - 1711 +56 1793 2 - 1791 +55 1740 6 - 1734 +54 1726 4 - 1722 +53 1711 8 - 1703 +52 1847 8 - 1839 +51 1866 4 - 1862 +50 2018 8 - 2010 +49 2182 4 - 2178 +48 2149 8 1 2142 +47 2141 4 - 2137 +46 2233 2 1 2232 +45 2210 5 - 2205 +44 2267 2 - 2265 +43 2315 4 - 2311 +42 2341 2 - 2339 +41 2368 1 - 2367 +40 2515 - - 2515 4-2 Table 3 (continued) Number Omitted New in Number Zone in AGK2 in AGK3 AGK3 in AGK3 +39 2544 5 - 2539 +38 2466 6 - 2460 +37 2371 8 - 2363 +36 2460 10 - 2450 +35 2496 - - 2496 +34 2457 2 - 2455 +33 2396 - - 2396 +32 2384 1 - 2383 +31 2466 4 - 2462 +30 2692 5 - 2687 +29 2978 3 - 2975 +28 2859 2 - 2857 +27 2820 1 - 2819 +26 2849 1 - 2848 +25 2861 2 - 2859 +24 2594 1 - 2593 +23 2491 1 - 2490 +22 2591 3 - 2588 +21 2640 6 - 2634 +20 2676 8 - 2668 +19 2478 12 - 2466 +18 2415 8 - 2407 +17 2652 7 - 2645 +16 2646 9 1 2638 +15 2666 13 - 2653 +14[1] 2661 15 - 2646 +13 2568 9 - 2559 +12 2816 21 - 2795 +11 2996 14 - 2982 +10[2] 3289 21 - 3268 + 9 3330 21 - 3309 + 8 3296 13 - 3283 + 7 3456 9 - 3447 + 6 3254 8 - 3246 + 5 3434 10 - 3424 + 4 3199 7 - 3192 + 3 3063 9 - 3054 + 2 2998 11 - 2987 + 1 2877 5 - 2872 + 0 2957 4 - 2953 4-3 Table 3 (concluded) Number Omitted New in Number Zone in AGK2 in AGK3 AGK3 in AGK3 - 0 3018 9 - 3009 - 1 2893 10 - 2883 - 2 1246 12 - 1234 Total 183588 446 3 183145 [1] Note that star +14 1650 was missing in AGK2 already [2] Note that star +10 986 was missing in AGK2 already Table 4. List of the 446 AGK2 Stars Omitted from AGK3. +89 4 +59 31 +53 120 +49 1611 +39 463 +34 1005 52 388 155 1785 2084 +32 446 +83 41 389 377 +48 83 2085 +31 239 +80 5 391 378 108 2087 1305 +79 157 704 380 457 2088 1341 +78 245 1076 381 459 +38 211 1435 +73 621 1165 383 460 875 +30 838 +70 738 +58 380 384 462 1000 944 776 381 +52 36 463 1225 1424 838 1609 417 1751 1711 1646 +63 28* +57 282 +52 418 +47 422 +38 2350* +30 2496 162 468 419 424 +37 434 +29 492 544 469 420 425 991 1162 796 470 1009 426 1265 2255 +62 353 471 1490a +46 185 1495 +28 209 354 778 1490b 1980 2049 1124 355 1017 +51 168 +45 412 2138 +27 1118 548 1640 513 1730 2188 +26 2794 790 +56 170 514 1985 2273 +25 464 +61 361 869 1411 2144 +36 444 465 +61 377 +55 365 +50 47 +45 2196 +36 665 +24 456 378 392 173 +44 337 764 +23 481 379 563 391 618 883 +22 817 382 595 432 +43 58 1016 818 +60 396 884 433 1960 1334 2096 398 1530 524 2289 1340 +21 251 399 +54 90 766 2305 1386 503 434 182 1258 +42 213 2214 1083 435 408 +49 476 2291 2313 1866 438 1471 477 +41 1837 +34 553 1977 4-4 Table 4 (concluded) +21 2164 +15 131 +12 799 +10 2264 + 7 3100 + 2 2304 +20 491 247 1094 2518 + 6 574 + 1 122 839 356 1199 3107 637 662 1363 529 1416 + 9 255 1136 1599 1633 1219 1421 317 1155 1784 1666 1471 1568 381 1421 2016 1711 1542 1569 544 1833 + 0 229 1886 1579 1768 549 2617 2241 1962 1580 1827 754 3249 2415 +19 176 1595 2243 1050 + 5 120 2901 +19 243 +15 1690 +12 2597 + 9 1239 + 5 186 - 0 616 352 1692 2760 1241 425 648 1335 2267 2782 1308 525 1104 1372 +14 11 +11 23 1321 1072 1637 1509 116 44 1388 1999 1719 1525 413 147 1482 2439 1843 1531 597 163 1621 3105 2584 1666 1239 393 1923 3241 2832 1867 1444* 399 1973 3403 2882 1953 1510 438 2155 + 4 617 - 1 300 +19 2173 +14 1600 +11 1107 + 9 2190 + 4 698 - 1 345 +18 894 1643 1231 2822 748 596 1196 1736 1241 3049 1079 622 1238 1954 1470 3065 1919 1517 1285 2256 2242 + 8 199 2178 1685 1427 2276 2513 265 2420 1734 1919 2576 2790 355 + 3 308 1906 2002 2584 +10 48 434 346 2162 2405 +13 356 172 981 696 2732 +17 384 359 403 1313 1347 - 2 13 +17 429 +13 428 +10 410 + 8 1335 + 3 1526 - 2 204 523 1186 425 2127 1660 205 1015 1193 479 2193 2068 208 1099 1410 1245 2203 2453 325 1387 1449 1293 2636 2992 428 1769 1887 1300 2842 + 2 192 870 +16 248 2300 1359 3225 505 962 256 +12 60 1425 + 7 86 801 963 257 62 1426 116 1244 1177 400 285 1427 516 1527 1180 +16 651 +12 365 +10 1428 + 7 681 + 2 1777 1215 755 389 1465 894 1946 1243 402 1538 1413 2134 2248 414 1884 1508 2151 2434 453 2092 2902 2186 * star listed in published catalog, but without proper motion 4-5 Table 5. List of Three Stars New in AGK3. +48 1052a +46 2072a +16 1409a Table 6. AGK3 Stars for which Proper-Motion Data in Right Ascension and/or Declination are Missing. Star Machine Version Published Version +66 961 4 2 +63 164 4 2 282 4 2 452 4 2 +62 106 4 2 +60 31 4 2 1126 4 2 +59 1334 4 2 +58 545a 5 3 +57 644 4 4 +54 126 4 2 +43 1056 4 2 +42 1131 4 4 1192 4 2 +38 523 4 4 2214 4 4 +37 1649 4 4 +32 1596 6 2 +30 188 4 2 1493 4 2 +29 484 4 2 486 4 2 510 4 4 546 4 2 856 4 2 1716 4 2 +28 454 6 2 792 4 2 1077 4 2 1083 4 4 +27 126 4 2 1113 4 4 1539 4 4 +19 218 4 4 849 4 4 +18 1450 4 2 (1) No proper motion in RA and Dec; (2) Omitted from catalog; (3) Included with proper motions; (4) Included without proper motions; (5) Proper motion in RA only; (6) Proper motion in Dec only. 4-6 Table 7. List of 19 AGK3 Stars with Component Identifications. AGK3 Remarks +83 508a 508b +78 551a 551b +73 274a +69 438a +64 1087a 1087b +63 33a +58 545a +55 58a 58b +51 1442a +48 1052a New in AGK3 +46 132a 2072a New in AGK3 +17 1610a Omitted in the printed catalog +16 1409a +11 889a 4-7 Table 8. AGK3 Stars with Probable Erroneous Declination Data. AGK2 Yale SAO AGK3 AGK3 +20 549 RA: 5 40 39.31 5 40 39.304 5 40 39.317 5 40 39.203 Dec: +20 24 31.8 +20 24 31.86 +20 24 31.79 +20 24 31.15 AGK3 +24 523 RA: 5 35 23.76 5 35 27.749 5 35 23.73 5 35 23.725 Dec: +24 57 53.3 +24 57 53.54 +24 57 52.28 +24 58 8.49 REFERENCES Cannon, A. J. (1925-1936), The Henry Draper Extension, Ann. Astron. Obs. Harvard College 100. Cannon, A. J. and Pickering, E. C. (1918-1924), The Henry Draper Catalogue, Ann. Astron. Obs. Harvard College 91-99. Dieckvoss, W. (in collaboration with H. Kox, A. Gunther and E. Brosterhus) 1975, AGK3 Star Catalogue of Positions and Proper Motions North of -2.5 Degrees Declination, Hamburg-Bergedorf (printed with financial support from Deutsche Forschungsgemeinschaft Bonn-Bad Godesberg). Nagy, T. A. 1979, Documentation for the Machine-Readable Version of the AGK3 Catalogue of Positions and Proper Motions North of -2.5 Degrees Declination, Systems and Applied Sciences Corporation R-SAW-7/79-35. Warren, W. H. Jr. and Kress, K. 1980, Astron. Data Center Bull. 1, 19. Willstrop, R. V. 1983, Bull. Inf. Cent. Donnees Stellaires No. 24, 65. 4-8