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989 Schwassmannia

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1532: 1090:
Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey".
1946: 677: 1140:
Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos".
1671: 1606: 1961: 1936: 713: 514: 502: 685: 372: 1664: 1599: 1005: 1956: 551: 160: 700: 1657: 1632: 1788: 578: 148: 37: 1592: 32: 349: 1720: 690: 617: 278: 1118: 823:). The results supersede an earlier, tentative observation by Italian Federico Manzini at the Sozzago Astronomical Station ( 1060: 1941: 1879: 1951: 1553: 1306: 1705: 570: 1869: 1859: 1191: 1864: 1032: 825: 805: 766: 760: 750: 44: 1700: 70: 903: 577:, approximately 12.5 kilometers (7.8 miles) in diameter. It was discovered on 18 November 1922, by astronomer 1884: 1768: 1680: 1526: 621: 488: 425: 380: 267: 254: 246: 1805: 1233: 927: 745: 657: 883:
adopts the result from IRAS, that is, an albedo of 0.2037 and a diameter of 12.86 kilometers based on an
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Lazzaro, D.; Angeli, C. A.; Carvano, J. M.; Mothé-Diniz, T.; Duffard, R.; Florczak, M. (November 2004).
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was named after its discoverer, German astronomer Arnold Schwassmann (1870–1964), who discovered
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on 12 November 1922, just 6 days prior to its official discovery observation at the
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mag. Quality code for this lightcurve is "2" at the LCDB. Summary figures at the
748:
observations by astronomers Vladimir Benishek at Sopot Astronomical Observatory (
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According to the surveys carried out by the Infrared Astronomical Satellite
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Benishek, Vladimir; Pilcher, Frederick; Martinez, Luis (April 2014).
770:) at Casa Grande in Arizona. Lightcurve analysis gave a well-defined 1190:
Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004).
1841: 1154: 844: 437: 1653: 1588: 1029:"JPL Small-Body Database Browser: 989 Schwassmannia (A922 WD)" 128: 1420:"Asteroids and comets rotation curves – (989) Schwassmannia" 684:(Berlin) and Hamburg–Bergedorf observatories. The official 597:
of 107.9 hours. It was named after the discoverer himself.
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Discovery Circumstances: Numbered Minor Planets (1)-(5000)
1307:"S3OS2: the visible spectroscopic survey of 820 asteroids" 799:). Alternative observations with a lower rated quality by 764:), New Mexico, and Luis Martinez at Lenomiya Observatory ( 122: 89: 829:) from October 2004, with an incorrect period 4.5 hours ( 680:
in total (including this one). Schwassmann worked at the
107: 95: 1260:"Rotation Period Determination for 989 Schwassmannia" 131: 110: 98: 92: 1378:"Asteroids Observed from CS3: 2013 October-December" 125: 1898: 1840: 1777: 1729: 1687: 525: 486: 444: 423: 378: 371: 359: 347: 337: 325: 310: 298: 288: 276: 266: 253: 239: 211: 180: 158: 142: 104: 101: 80: 68: 63: 55: 43: 31: 26: 875:kilometers in diameter and its surface has a high 1093:Publications of the Astronomical Society of Japan 988:Schmadel, Lutz D. (2007). "(989) Schwassmannia". 1947:Discoveries by Friedrich Karl Arnold Schwassmann 1300: 1298: 1296: 1253: 1251: 714:Small Solar System Objects Spectroscopic Survey 1355:"Asteroid 989 Schwassmannia – Proper Elements" 1135: 1133: 1131: 712:In the Tholen- and SMASS-like taxonomy of the 1665: 1600: 632:once every 4 years and 4 months (1,584 days; 8: 953: 951: 949: 947: 945: 21: 16:Stony background asteroid and a slow rotator 1693: 1672: 1658: 1650: 1607: 1593: 1585: 1530: 992:. Springer Berlin Heidelberg. p. 86. 983: 981: 979: 906:by Robert Stephens with a rotation period 1462:Asteroids and comets rotation curves, CdR 1153: 1023: 1021: 1019: 1017: 1055: 1053: 1051: 1049: 803:at the Center for Solar System Studies ( 628:main-belt at a distance of 2.0–3.3  1962:Astronomical objects discovered in 1922 1937:Minor planet object articles (numbered) 1185: 1183: 1181: 1085: 1083: 1081: 941: 896: 1228: 1226: 1224: 904:Lightcurve plot of (989) Schwassmannia 881:Collaborative Asteroid Lightcurve Link 20: 1236:. Asteroid Lightcurve Database (LCDB) 809:) in September 2013 gave a period of 782:hours with a brightness amplitude of 350:Longitude of ascending node 7: 1357:. AstDyS-2, Asteroids – Dynamic Site 914:hours and a brightness amplitude of 1535: 1464:– Geneva Observatory, Raoul Behrend 1234:"LCDB Data for (989) Schwassmannia" 636:of 2.66 AU). Its orbit has an 1376:Stephens, Robert D. (April 2014). 855:mission of NASA's WISE telescope, 14: 579:Friedrich Karl Arnold Schwassmann 149:Friedrich Karl Arnold Schwassmann 1478:AstDyS-2, Asteroids—Dynamic Site 1456:Dictionary of Minor Planet Names 990:Dictionary of Minor Planet Names 585:in Hamburg, Germany. The bright 573:from the central regions of the 85: 1192:"IRAS Minor Planet Survey V6.0" 924:Center for Solar System Studies 758:at his Organ Mesa Observatory ( 736:In November 2013, a rotational 1202:: IRAS-A-FPA-3-RDR-IMPS-V6.0. 691:The Names of the Minor Planets 618:hierarchical clustering method 1: 998:10.1007/978-3-540-29925-7_990 959:"989 Schwassmannia (A922 WD)" 1334:10.1016/j.icarus.2004.06.006 1061:"Asteroid 989 Schwassmannia" 678:four comets and 22 asteroids 612:asteroid of the main belt's 1957:Slow rotating minor planets 1172:10.1088/0004-637X/791/2/121 879:between 0.20 and 0.31. The 624:. It orbits the Sun in the 362:Argument of perihelion 1978: 1196:NASA Planetary Data System 593:-type asteroid has a long 183:Minor planet category 1696: 1681:Small Solar System bodies 1622: 1447:Lightcurve Database Query 1142:The Astrophysical Journal 1033:Jet Propulsion Laboratory 540: 301:Orbital period (sidereal) 231: 219: 1065:Small Bodies Data Ferret 1031:(2019-05-11 last obs.). 708:Physical characteristics 601:Orbit and classification 528:Absolute magnitude  373:Physical characteristics 161:Alternative designations 1616:Minor planets navigator 1527:JPL Small-Body Database 622:proper orbital elements 426:Synodic rotation period 213:Orbital characteristics 1806:Trans-Neptunian object 1491:Observation prediction 1113:10.1093/pasj/63.5.1117 658:Heidelberg Observatory 1470:– Minor Planet Center 1385:Minor Planet Bulletin 1267:Minor Planet Bulletin 662:Bergedorf Observatory 614:background population 583:Bergedorf Observatory 233:Uncertainty parameter 1942:Background asteroids 1779:Distant minor planet 1451:www.minorplanet.info 754:), Serbia, American 648:with respect to the 153:(discoverer himself) 71:MPC designation 1952:Named minor planets 1578:Physical parameters 1397:2014MPBu...41...92S 1326:2004Icar..172..179L 1279:2014MPBu...41..133B 1208:2004PDSS...12.....T 1164:2014ApJ...791..121M 1123:AcuA catalog p. 153 1105:2011PASJ...63.1117U 963:Minor Planet Center 839:Diameter and albedo 567:background asteroid 76:(989) Schwassmannia 56:Discovery date 45:Discovery site 23: 1515:Observational info 1424:Geneva Observatory 885:absolute magnitude 744:was obtained from 616:when applying the 33:Discovered by 1924: 1923: 1836: 1835: 1721:Meanings of names 1647: 1646: 1633:989 Schwassmannia 1522:989 Schwassmannia 1474:989 Schwassmannia 1007:978-3-540-00238-3 859:measures between 756:Frederick Pilcher 688:was mentioned in 552:prov. designation 547:989 Schwassmannia 544: 543: 333:0° 13 38.28 / day 306:4.34 yr (1,584 d) 22:989 Schwassmannia 1969: 1694: 1674: 1667: 1660: 1651: 1609: 1602: 1595: 1586: 1570:Orbital elements 1534: 1435: 1434: 1432: 1430: 1418:Behrend, Raoul. 1415: 1409: 1408: 1382: 1373: 1367: 1366: 1364: 1362: 1351: 1345: 1344: 1342: 1340: 1311: 1302: 1291: 1290: 1264: 1255: 1246: 1245: 1243: 1241: 1230: 1219: 1218: 1216: 1214: 1187: 1176: 1175: 1157: 1137: 1126: 1116: 1099:(5): 1117–1138. 1087: 1076: 1075: 1073: 1071: 1057: 1044: 1043: 1041: 1039: 1025: 1012: 1011: 985: 974: 973: 971: 969: 955: 930: 921: 919: 913: 911: 901: 874: 872: 866: 864: 834: 828: 822: 816: 814: 808: 798: 789: 787: 781: 779: 769: 763: 753: 728:, respectively. 703: 564: 558: 518: 506: 479: 477: 470: 468: 461: 459: 447:Geometric albedo 440: 435: 416: 414: 407: 405: 398: 393: 202: 154: 138: 137: 134: 133: 130: 127: 124: 119: 118: 115: 112: 109: 106: 103: 100: 97: 94: 91: 59:18 November 1922 27:Discovery  24: 1977: 1976: 1972: 1971: 1970: 1968: 1967: 1966: 1927: 1926: 1925: 1920: 1894: 1832: 1773: 1725: 1683: 1678: 1648: 1643: 1618: 1613: 1507:Proper elements 1443: 1438: 1428: 1426: 1417: 1416: 1412: 1380: 1375: 1374: 1370: 1360: 1358: 1353: 1352: 1348: 1338: 1336: 1309: 1304: 1303: 1294: 1262: 1257: 1256: 1249: 1239: 1237: 1232: 1231: 1222: 1212: 1210: 1189: 1188: 1179: 1139: 1138: 1129: 1089: 1088: 1079: 1069: 1067: 1059: 1058: 1047: 1037: 1035: 1027: 1026: 1015: 1008: 987: 986: 977: 967: 965: 957: 956: 943: 939: 934: 933: 917: 915: 909: 907: 902: 898: 893: 870: 868: 862: 860: 849:Akari satellite 847:, the Japanese 841: 830: 824: 818: 812: 810: 804: 801:Robert Stephens 794: 785: 783: 777: 775: 772:rotation period 765: 759: 749: 734: 732:Rotation period 726:T-type asteroid 710: 699: 686:naming citation 670: 654:observation arc 640:of 0.25 and an 634:semi-major axis 603: 595:rotation period 562: 556: 533: 521: 512: 500: 491: 482: 475: 473: 466: 464: 457: 455: 449: 433: 431: 428: 419: 412: 410: 403: 401: 391: 389: 383: 364: 352: 330: 315: 303: 281: 279:Semi-major axis 241:Observation arc 223:27 April 2019 ( 203: 196: 185: 171: 163: 152: 151: 145: 121: 88: 84: 73: 17: 12: 11: 5: 1975: 1973: 1965: 1964: 1959: 1954: 1949: 1944: 1939: 1929: 1928: 1922: 1921: 1919: 1918: 1913: 1908: 1902: 1900: 1896: 1895: 1893: 1892: 1887: 1882: 1880:Near-parabolic 1877: 1872: 1867: 1862: 1857: 1852: 1846: 1844: 1838: 1837: 1834: 1833: 1831: 1830: 1829: 1828: 1826:Scattered disc 1823: 1818: 1813: 1803: 1798: 1797: 1796: 1794:Neptune trojan 1791: 1783: 1781: 1775: 1774: 1772: 1771: 1769:Spectral types 1766: 1761: 1759:Jupiter trojan 1756: 1751: 1746: 1741: 1735: 1733: 1727: 1726: 1724: 1723: 1718: 1713: 1708: 1703: 1697: 1691: 1685: 1684: 1679: 1677: 1676: 1669: 1662: 1654: 1645: 1644: 1642: 1641: 1636: 1629: 1623: 1620: 1619: 1614: 1612: 1611: 1604: 1597: 1589: 1583: 1582: 1581: 1580: 1538:Close approach 1519: 1518: 1517: 1471: 1465: 1459: 1458:, Google books 1453: 1442: 1441:External links 1439: 1437: 1436: 1410: 1368: 1346: 1320:(1): 179–220. 1292: 1247: 1220: 1177: 1127: 1077: 1045: 1013: 1006: 975: 940: 938: 935: 932: 931: 895: 894: 892: 889: 840: 837: 733: 730: 709: 706: 669: 666: 656:begins at the 602: 599: 542: 541: 538: 537: 534: 526: 523: 522: 520: 519: 507: 494: 492: 487: 484: 483: 481: 480: 471: 462: 452: 450: 445: 442: 441: 429: 424: 421: 420: 418: 417: 408: 399: 386: 384: 379: 376: 375: 369: 368: 365: 360: 357: 356: 353: 348: 345: 344: 341: 335: 334: 331: 326: 323: 322: 316: 311: 308: 307: 304: 299: 296: 295: 292: 286: 285: 282: 277: 274: 273: 270: 264: 263: 257: 251: 250: 243: 237: 236: 229: 228: 217: 216: 209: 208: 186: 181: 178: 177: 164: 159: 156: 155: 146: 143: 140: 139: 82: 78: 77: 74: 69: 66: 65: 61: 60: 57: 53: 52: 50:Bergedorf Obs. 47: 41: 40: 38:A. Schwassmann 35: 29: 28: 15: 13: 10: 9: 6: 4: 3: 2: 1974: 1963: 1960: 1958: 1955: 1953: 1950: 1948: 1945: 1943: 1940: 1938: 1935: 1934: 1932: 1917: 1914: 1912: 1909: 1907: 1904: 1903: 1901: 1897: 1891: 1888: 1886: 1883: 1881: 1878: 1876: 1873: 1871: 1868: 1866: 1863: 1861: 1858: 1856: 1853: 1851: 1848: 1847: 1845: 1843: 1839: 1827: 1824: 1822: 1819: 1817: 1814: 1812: 1809: 1808: 1807: 1804: 1802: 1799: 1795: 1792: 1790: 1787: 1786: 1785: 1784: 1782: 1780: 1776: 1770: 1767: 1765: 1762: 1760: 1757: 1755: 1752: 1750: 1749:Asteroid belt 1747: 1745: 1744:Aten asteroid 1742: 1740: 1737: 1736: 1734: 1732: 1728: 1722: 1719: 1717: 1714: 1712: 1709: 1707: 1704: 1702: 1699: 1698: 1695: 1692: 1690: 1689:Minor planets 1686: 1682: 1675: 1670: 1668: 1663: 1661: 1656: 1655: 1652: 1640: 1637: 1635: 1634: 1630: 1628: 1625: 1624: 1621: 1617: 1610: 1605: 1603: 1598: 1596: 1591: 1590: 1587: 1579: 1575: 1571: 1567: 1563: 1562:Orbit diagram 1559: 1555: 1551: 1547: 1543: 1539: 1536: 1533: 1529: 1528: 1523: 1520: 1516: 1512: 1508: 1504: 1500: 1496: 1492: 1488: 1484: 1481: 1480: 1479: 1475: 1472: 1469: 1466: 1463: 1460: 1457: 1454: 1452: 1448: 1445: 1444: 1440: 1425: 1421: 1414: 1411: 1406: 1402: 1398: 1394: 1390: 1386: 1379: 1372: 1369: 1356: 1350: 1347: 1335: 1331: 1327: 1323: 1319: 1315: 1308: 1301: 1299: 1297: 1293: 1288: 1284: 1280: 1276: 1272: 1268: 1261: 1254: 1252: 1248: 1235: 1229: 1227: 1225: 1221: 1209: 1205: 1201: 1197: 1193: 1186: 1184: 1182: 1178: 1173: 1169: 1165: 1161: 1156: 1151: 1147: 1143: 1136: 1134: 1132: 1128: 1124: 1120: 1114: 1110: 1106: 1102: 1098: 1094: 1086: 1084: 1082: 1078: 1066: 1062: 1056: 1054: 1052: 1050: 1046: 1034: 1030: 1024: 1022: 1020: 1018: 1014: 1009: 1003: 999: 995: 991: 984: 982: 980: 976: 964: 960: 954: 952: 950: 948: 946: 942: 936: 929: 925: 905: 900: 897: 890: 888: 886: 882: 878: 858: 857:Schwassmannia 854: 850: 846: 838: 836: 833: 827: 821: 807: 802: 797: 792: 773: 768: 762: 757: 752: 747: 743: 742:Schwassmannia 739: 731: 729: 727: 723: 719: 718:Schwassmannia 715: 707: 705: 702: 697: 693: 692: 687: 683: 679: 675: 667: 665: 663: 659: 655: 652:. The body's 651: 647: 643: 639: 635: 631: 627: 623: 619: 615: 611: 607: 606:Schwassmannia 600: 598: 596: 592: 588: 584: 580: 576: 575:asteroid belt 572: 568: 565:) is a stony 561: 555: 553: 548: 539: 535: 532: 531: 524: 516: 511: 508: 504: 499: 496: 495: 493: 490: 489:Spectral type 485: 472: 463: 454: 453: 451: 448: 443: 439: 430: 427: 422: 409: 406:0.124 km 400: 397: 388: 387: 385: 382: 381:Mean diameter 377: 374: 370: 366: 363: 358: 354: 351: 346: 342: 340: 336: 332: 329: 324: 321: 317: 314: 309: 305: 302: 297: 293: 291: 287: 283: 280: 275: 271: 269: 265: 262: 258: 256: 252: 248: 244: 242: 238: 234: 230: 226: 222: 218: 214: 210: 206: 200: 194: 191:   190: 187: 184: 179: 175: 172:1935 UE  169: 166:A922 WD  165: 162: 157: 150: 147: 141: 136: 83: 81:Pronunciation 79: 75: 72: 67: 62: 58: 54: 51: 48: 46: 42: 39: 36: 34: 30: 25: 19: 1916:Space debris 1631: 1627:988 Appella 1573: 1565: 1557: 1549: 1541: 1525: 1510: 1502: 1499:Orbital info 1494: 1486: 1477: 1450: 1427:. Retrieved 1413: 1391:(2): 92–95. 1388: 1384: 1371: 1359:. Retrieved 1349: 1337:. Retrieved 1317: 1313: 1270: 1266: 1238:. Retrieved 1211:. Retrieved 1199: 1195: 1145: 1141: 1096: 1092: 1068:. Retrieved 1064: 1036:. Retrieved 989: 966:. Retrieved 962: 899: 880: 856: 842: 741: 735: 717: 711: 689: 674:minor planet 671: 664:in Hamburg. 638:eccentricity 605: 604: 571:slow rotator 559: 550: 546: 545: 529: 313:Mean anomaly 290:Eccentricity 192: 176: 1935 UF 173: 170: 1922 MW 167: 64:Designations 18: 1906:Cosmic dust 1870:Long-period 1860:Halley-type 1816:Kuiper belt 1701:Designation 1449:(LCDB), at 746:photometric 696:Paul Herget 642:inclination 415:0.8 km 339:Inclination 328:Mean motion 144:Named after 1931:Categories 1911:Meteoroids 1890:Sungrazing 1865:Hyperbolic 1821:Oort cloud 1764:Near-Earth 1639:990 Yerkes 1429:4 February 1361:4 February 1339:4 February 1273:(2): 133. 1240:4 February 1213:4 February 1070:4 February 1038:4 February 968:4 February 937:References 738:lightcurve 436:0.01  394:1.12  268:Perihelion 249:(35,244 d) 227:2458600.5) 205:background 1801:Damocloid 1554:Ephemeris 1546:Discovery 1483:Ephemeris 1405:1052-8091 1287:1052-8091 1155:1406.6645 1148:(2): 11. 887:of 11.8. 791:magnitude 716:(S3OS2), 698:in 1955 ( 608:is a non- 284:2.6588 AU 272:1.9915 AU 189:main-belt 1885:Periodic 1811:Detached 1731:Asteroid 851:and the 650:ecliptic 255:Aphelion 1850:Extinct 1789:Centaur 1524:at the 1393:Bibcode 1322:Bibcode 1275:Bibcode 1204:Bibcode 1160:Bibcode 1101:Bibcode 853:NEOWISE 817:hours ( 682:Potsdam 626:central 620:to its 581:at the 563:1922 MW 557:A922 WD 367:165.73° 355:243.40° 343:14.700° 259:3.3261 215:  207:  1842:Comets 1754:Family 1739:Active 1706:Groups 1574:· 1572:  1566:· 1564:  1558:· 1556:  1550:· 1548:  1542:· 1540:  1511:· 1509:  1503:· 1501:  1495:· 1493:  1487:· 1485:  1403:  1314:Icarus 1285:  1119:online 1004:  877:albedo 776:107.85 722:S-type 720:is an 668:Naming 610:family 569:and a 456:0.2035 432:107.85 402:12.630 318:83.840 294:0.2510 245:96.49 199:middle 193:· 174:· 168:· 1899:Other 1855:Great 1576: 1568: 1560: 1552: 1544: 1513: 1505: 1497: 1489: 1381:(PDF) 1310:(PDF) 1263:(PDF) 1150:arXiv 908:120.3 891:Notes 869:12.86 861:12.20 811:120.3 672:This 644:of 15 515:S3OS2 503:S3OS2 478:0.064 474:0.306 469:0.043 465:0.226 460:0.027 411:12.86 390:12.20 221:Epoch 195: 1875:Lost 1716:Moon 1711:List 1431:2020 1401:ISSN 1363:2020 1341:2020 1283:ISSN 1242:2020 1215:2020 1072:2020 1040:2020 1002:ISBN 970:2020 928:LCDB 926:and 920:0.05 916:0.39 867:and 865:1.12 845:IRAS 788:0.02 784:0.35 780:0.01 724:and 701:H 94 536:11.8 517:-BB) 505:-TH) 1476:at 1330:doi 1318:172 1168:doi 1146:791 1109:doi 994:doi 873:0.8 835:). 832:U=1 826:A12 820:U=2 806:U81 796:U=3 774:of 767:H13 761:G50 751:K90 740:of 704:). 694:by 530:(H) 1933:: 1422:. 1399:. 1389:41 1387:. 1383:. 1328:. 1316:. 1312:. 1295:^ 1281:. 1271:41 1269:. 1265:. 1250:^ 1223:^ 1200:12 1198:. 1194:. 1180:^ 1166:. 1158:. 1144:. 1130:^ 1121:, 1107:. 1097:63 1095:. 1080:^ 1063:. 1048:^ 1016:^ 1000:. 978:^ 961:. 944:^ 630:AU 560:or 396:km 261:AU 247:yr 225:JD 135:-/ 129:ɑː 1673:e 1666:t 1659:v 1608:e 1601:t 1594:v 1433:. 1407:. 1395:: 1365:. 1343:. 1332:: 1324:: 1289:. 1277:: 1244:. 1217:. 1206:: 1174:. 1170:: 1162:: 1152:: 1125:) 1117:( 1115:. 1111:: 1103:: 1074:. 1042:. 1010:. 996:: 972:. 918:± 912:1 910:± 871:± 863:± 815:1 813:± 793:( 786:± 778:± 646:° 591:T 589:/ 587:S 554:: 549:( 513:( 510:T 501:( 498:S 476:± 467:± 458:± 438:h 434:± 413:± 404:± 392:± 320:° 235:0 201:) 197:( 132:s 126:v 123:ʃ 120:, 117:ə 114:i 111:n 108:æ 105:m 102:ˈ 99:s 96:æ 93:w 90:ʃ 87:/

Index

Discovered by
A. Schwassmann
Discovery site
Bergedorf Obs.
MPC designation
/ʃwæsˈmæniə,ʃvɑːs-/
Friedrich Karl Arnold Schwassmann
Alternative designations
Minor planet category
main-belt
middle
background
Orbital characteristics
Epoch
JD
Uncertainty parameter
Observation arc
yr
Aphelion
AU
Perihelion
Semi-major axis
Eccentricity
Orbital period (sidereal)
Mean anomaly
°
Mean motion
Inclination
Longitude of ascending node
Argument of perihelion

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