31:
993:
999:
987:
1220:
967:
1452:
1877:
1552:
1889:
1865:
1541:
549:, but none of the virtual impact dates were before 2029. As the observation arc became longer and the orbital parameters better constrained, it was removed from the Sentry Risk Table on 20 December 2016. With a 111-day observation arc, it is now known that it has a 4.86 year orbital period and currently stays inside the orbit of
522:) and is not considered a threat for the foreseeable future. The 2017 approach did not bring it particularly close to Earth. In December 1944 it passed about 0.19 AU (28,000,000 km; 18,000,000 mi) from Earth and in February 2149 it will pass about 0.06 AU (9,000,000 km; 5,600,000 mi) from Earth.
567:
1919:
1598:
1914:
1039:
563:'s dynamics over a period of 100 million days (~274,000 years) found that it had roughly a 60% chance of originating from the outer Solar System as a long-period comet.
1934:
30:
347:
467:
origins, which illustrates the blurry boundary between asteroids and comets. It is speculated that over time, this object has lost the majority of the
1924:
1591:
1465:
921:
1219:
966:
1215:
1929:
460:
317:
302:
760:
1584:
1715:
992:
52:
278:
1647:
481:
426:
203:
1806:
1855:
1565:
1560:
1555:
487:
126:
868:
786:
1632:
914:
1796:
1786:
813:
308:
1909:
1791:
642:
64:
1627:
94:
998:
733:
327:
666:
1811:
1695:
1607:
1475:
1451:
1015:
846:
602:
468:
355:
232:
192:
179:
1732:
1405:
949:
942:
907:
1637:
290:
161:
986:
1705:
1288:
1283:
975:
214:
1893:
1489:
1484:
1460:
1424:
962:
671:
267:
566:
1545:
1515:
1494:
386:
876:
1690:
1642:
1031:
1020:
546:
511:
422:
185:
149:
118:
1869:
1816:
1434:
1395:
764:
367:
142:
860:
852:
1737:
1680:
1665:
1415:
892:
538:
430:
376:
169:
134:
841:
598:
1881:
1752:
1720:
1685:
738:
638:
542:
248:
225:
884:
705:
1903:
1776:
1675:
1670:
1205:
1128:
459:, the asteroid-and-comet-hunting portion of the Wide-Field Infrared Survey Explorer (
448:
418:
1876:
1842:
1615:
1499:
1470:
1007:
241:
111:
1429:
1832:
1781:
1742:
1335:
1330:
1325:
1320:
1233:
256:
1801:
1747:
1524:
1439:
1315:
1308:
1303:
1293:
1268:
1253:
1243:
153:
1837:
1727:
1576:
1352:
1248:
1182:
1134:
1093:
1045:
790:
515:
480:
is about 0.5–1.0 km (0.3–0.6 mi) across so is one of the larger
1657:
1421:
1410:
1400:
1384:
1347:
1298:
1273:
1238:
1228:
1194:
1170:
1158:
1146:
1117:
1105:
1069:
1057:
414:
1357:
1278:
1263:
550:
456:
455:-like dust and gas cloud. It was first observed on 27 November 2016 by
57:
1389:
1343:
1258:
1768:
565:
507:
464:
452:
338:
899:
710:
519:
1580:
903:
447:
is unusually dark for a near-Earth asteroid. It is possibly an
704:
Agle, DC; Cantillo, Laurie; Brown, Dwayne (29 December 2016).
789:. NASA/JPL Near-Earth Object Program Office. Archived from
814:"2016 WF9 – a simulation based on Jan 5th orbital params"
537:
was first announced and had a short insignificant 3 day
463:) mission. According to NEOWISE, this object could have
1920:
Near-Earth objects removed from the Sentry Risk Table
1853:
1825:
1767:
1704:
1656:
1614:
1508:
1448:
1377:
1214:
1029:
1006:
961:
706:"NASA's NEOWISE Mission Spies One Comet, Maybe Two"
545:. The preliminary orbit was also listed on the JPL
384:
365:
353:
346:
326:
315:
300:
288:
276:
266:
254:
239:
223:
213:
201:
191:
178:
168:
141:
109:
92:
87:
75:
63:
51:
46:
763:. hohmanntransfer. 1 December 2016. Archived from
510:on 25 February 2017 at a distance of 0.3407
593:
591:
577:on 25 February 2017, closest approach to Earth.
1592:
915:
639:"JPL Small-Body Database Browser: (2016 WF9)"
8:
661:
659:
18:
699:
697:
695:
693:
691:
689:
1620:
1599:
1585:
1577:
922:
908:
900:
734:"NASA'S NEOWISE Missions Spots New Comets"
29:
1915:Minor planet object articles (unnumbered)
633:
631:
629:
627:
625:
623:
621:
978:(miniature space telescope; August 2017)
1935:Astronomical objects discovered in 2016
1860:
587:
541:, it was estimated to have a 7.6 year
17:
812:Odasso, Alessandro (9 January 2017).
279:Longitude of ascending node
7:
850:
732:Williams, Matt (30 December 2016).
14:
1887:
1875:
1863:
1551:
1550:
1539:
1527:(Earth gravity assist; Sep 2017)
1521:(impacted into Saturn; Sep 2017)
1450:
1218:
997:
991:
985:
965:
1925:Potentially hazardous asteroids
482:potentially hazardous asteroid
427:potentially hazardous asteroid
1:
1566:Category:2018 in outer space
1561:Category:2017 in outer space
1556:Category:2016 in outer space
1466:41P/Tuttle–Giacobini–Kresák
291:Argument of perihelion
82:(discovery: first observed)
1951:
1930:Near-Earth objects in 2017
599:"MPEC 2016-W125: 2016 WF9"
112:Minor planet category
1623:
1608:Small Solar System bodies
1534:
1040:Asteroid close approaches
983:
935:
643:Jet Propulsion Laboratory
413:is a dark, sub-kilometer
399:
226:Orbital period (sidereal)
160:
148:
28:
641:(2017-04-20 last obs.).
387:Absolute magnitude
348:Physical characteristics
847:JPL Small-Body Database
818:odassoastro.blogspot.it
603:IAU Minor Planet Center
143:Orbital characteristics
1733:Trans-Neptunian object
1546:Outer space portal
1406:Saraswati Supercluster
578:
35:Artist's rendition of
569:
162:Uncertainty parameter
1706:Distant minor planet
1289:OGLE-2016-BLG-1195Lb
1284:OGLE-2016-BLG-1190Lb
963:Space probe launches
488:list of largest PHAs
95:MPC designation
1485:C/2015 V2 (Johnson)
1461:C/2016 U1 (NEOWISE)
1425:neutron star merger
893:Physical parameters
787:"Date/Time Removed"
672:Minor Planet Center
76:Discovery date
65:Discovery site
25:
1495:C/2017 O1 (ASASSN)
767:on 3 February 2017
605:. 30 November 2016
579:
518:; 31,670,000
484:near-Earth object
451:, but without the
152:4 September 2017 (
53:Discovered by
1851:
1850:
1763:
1762:
1648:Meanings of names
1574:
1573:
1509:Space exploration
1021:2017 China bolide
547:Sentry Risk Table
514:(50,970,000
423:near-Earth object
403:
402:
1942:
1910:Apollo asteroids
1892:
1891:
1890:
1880:
1879:
1868:
1867:
1866:
1859:
1621:
1601:
1594:
1587:
1578:
1554:
1553:
1544:
1543:
1542:
1454:
1396:moons of Jupiter
1222:
1202:
1200:
1199:
1190:
1188:
1187:
1178:
1176:
1175:
1166:
1164:
1163:
1154:
1152:
1151:
1142:
1140:
1139:
1125:
1123:
1122:
1113:
1111:
1110:
1101:
1099:
1098:
1089:
1087:
1086:
1077:
1075:
1074:
1065:
1063:
1062:
1053:
1051:
1050:
1001:
995:
989:
969:
952:
945:
924:
917:
910:
901:
885:Orbital elements
829:
828:
826:
824:
809:
803:
802:
800:
798:
783:
777:
776:
774:
772:
757:
751:
750:
748:
746:
729:
723:
722:
720:
718:
701:
684:
683:
681:
679:
663:
654:
653:
651:
649:
635:
616:
614:
612:
610:
595:
576:
562:
556:A simulation of
536:
505:
479:
471:on its surface.
446:
421:, classified as
411:
380:
368:Geometric albedo
342:
262:0° 12 9.36 / day
137:
105:
83:
79:27 November 2016
41:
33:
26:
24:
1950:
1949:
1945:
1944:
1943:
1941:
1940:
1939:
1900:
1899:
1898:
1888:
1886:
1874:
1864:
1862:
1854:
1852:
1847:
1821:
1759:
1700:
1652:
1610:
1605:
1575:
1570:
1540:
1538:
1530:
1504:
1479:
1444:
1435:ULAS J1342+0928
1416:IGR J17329-2731
1373:
1210:
1197:
1196:
1193:
1185:
1184:
1181:
1173:
1172:
1169:
1161:
1160:
1157:
1149:
1148:
1145:
1137:
1136:
1133:
1120:
1119:
1116:
1108:
1107:
1104:
1096:
1095:
1092:
1084:
1083:
1080:
1072:
1071:
1068:
1060:
1059:
1056:
1048:
1047:
1044:
1025:
1016:Bolides in 2017
1002:
996:
990:
981:
957:
954:
948:
946:
941:
931:
928:
838:
833:
832:
822:
820:
811:
810:
806:
796:
794:
785:
784:
780:
770:
768:
761:"Tracking News"
759:
758:
754:
744:
742:
731:
730:
726:
716:
714:
703:
702:
687:
677:
675:
665:
664:
657:
647:
645:
637:
636:
619:
608:
606:
597:
596:
589:
584:
575:
571:
561:
557:
539:observation arc
535:
531:
528:
504:
500:
498:
478:
474:
445:
441:
439:
410:
406:
392:
374:
370:
361:0.5–1.0 km
358:
336:
331:
307:0.0156 AU (6.1
293:
281:
259:
244:
228:
206:
204:Semi-major axis
170:Observation arc
117:
114:
104:
100:
97:
81:
80:
42:
40:
36:
23:
19:
12:
11:
5:
1948:
1946:
1938:
1937:
1932:
1927:
1922:
1917:
1912:
1902:
1901:
1897:
1896:
1884:
1872:
1849:
1848:
1846:
1845:
1840:
1835:
1829:
1827:
1823:
1822:
1820:
1819:
1814:
1809:
1807:Near-parabolic
1804:
1799:
1794:
1789:
1784:
1779:
1773:
1771:
1765:
1764:
1761:
1760:
1758:
1757:
1756:
1755:
1753:Scattered disc
1750:
1745:
1740:
1730:
1725:
1724:
1723:
1721:Neptune trojan
1718:
1710:
1708:
1702:
1701:
1699:
1698:
1696:Spectral types
1693:
1688:
1686:Jupiter trojan
1683:
1678:
1673:
1668:
1662:
1660:
1654:
1653:
1651:
1650:
1645:
1640:
1635:
1630:
1624:
1618:
1612:
1611:
1606:
1604:
1603:
1596:
1589:
1581:
1572:
1571:
1569:
1568:
1548:
1535:
1532:
1531:
1529:
1528:
1522:
1512:
1510:
1506:
1505:
1503:
1502:
1497:
1492:
1487:
1482:
1477:
1473:
1468:
1463:
1457:
1455:
1446:
1445:
1443:
1442:
1437:
1432:
1427:
1419:
1418:(X-ray source)
1413:
1408:
1403:
1398:
1392:
1390:Ring of Haumea
1387:
1381:
1379:
1375:
1374:
1372:
1371:
1370:
1369:
1366:
1363:
1355:
1350:
1340:
1339:
1338:
1333:
1328:
1323:
1313:
1312:
1311:
1306:
1296:
1291:
1286:
1281:
1276:
1271:
1266:
1261:
1256:
1251:
1246:
1241:
1236:
1231:
1225:
1223:
1212:
1211:
1209:
1208:
1203:
1191:
1179:
1167:
1155:
1143:
1131:
1126:
1114:
1102:
1090:
1078:
1066:
1054:
1042:
1036:
1034:
1027:
1026:
1024:
1023:
1018:
1012:
1010:
1004:
1003:
984:
982:
980:
979:
972:
970:
959:
958:
956:
955:
947:
939:
936:
933:
932:
929:
927:
926:
919:
912:
904:
898:
897:
896:
895:
853:Close approach
837:
836:External links
834:
831:
830:
804:
793:on 2 June 2002
778:
752:
739:Universe Today
724:
685:
655:
617:
586:
585:
583:
580:
573:
559:
543:orbital period
533:
527:
524:
502:
497:
494:
476:
443:
438:
435:
417:and suspected
408:
401:
400:
397:
396:
393:
385:
382:
381:
371:
366:
363:
362:
359:
354:
351:
350:
344:
343:
333:
329:
324:
323:
320:
313:
312:
305:
298:
297:
294:
289:
286:
285:
282:
277:
274:
273:
270:
264:
263:
260:
255:
252:
251:
245:
240:
237:
236:
229:
224:
221:
220:
217:
211:
210:
207:
202:
199:
198:
195:
189:
188:
182:
176:
175:
172:
166:
165:
158:
157:
146:
145:
139:
138:
115:
110:
107:
106:
102:
98:
93:
90:
89:
85:
84:
77:
73:
72:
67:
61:
60:
55:
49:
48:
44:
43:
38:
34:
21:
13:
10:
9:
6:
4:
3:
2:
1947:
1936:
1933:
1931:
1928:
1926:
1923:
1921:
1918:
1916:
1913:
1911:
1908:
1907:
1905:
1895:
1885:
1883:
1878:
1873:
1871:
1861:
1857:
1844:
1841:
1839:
1836:
1834:
1831:
1830:
1828:
1824:
1818:
1815:
1813:
1810:
1808:
1805:
1803:
1800:
1798:
1795:
1793:
1790:
1788:
1785:
1783:
1780:
1778:
1775:
1774:
1772:
1770:
1766:
1754:
1751:
1749:
1746:
1744:
1741:
1739:
1736:
1735:
1734:
1731:
1729:
1726:
1722:
1719:
1717:
1714:
1713:
1712:
1711:
1709:
1707:
1703:
1697:
1694:
1692:
1689:
1687:
1684:
1682:
1679:
1677:
1676:Asteroid belt
1674:
1672:
1671:Aten asteroid
1669:
1667:
1664:
1663:
1661:
1659:
1655:
1649:
1646:
1644:
1641:
1639:
1636:
1634:
1631:
1629:
1626:
1625:
1622:
1619:
1617:
1616:Minor planets
1613:
1609:
1602:
1597:
1595:
1590:
1588:
1583:
1582:
1579:
1567:
1563:
1562:
1557:
1549:
1547:
1537:
1536:
1533:
1526:
1523:
1520:
1518:
1514:
1513:
1511:
1507:
1501:
1498:
1496:
1493:
1491:
1488:
1486:
1483:
1481:
1474:
1472:
1469:
1467:
1464:
1462:
1459:
1458:
1456:
1453:
1447:
1441:
1438:
1436:
1433:
1431:
1428:
1426:
1423:
1420:
1417:
1414:
1412:
1409:
1407:
1404:
1402:
1399:
1397:
1393:
1391:
1388:
1386:
1383:
1382:
1380:
1376:
1367:
1364:
1361:
1360:
1359:
1356:
1354:
1351:
1349:
1345:
1341:
1337:
1334:
1332:
1329:
1327:
1324:
1322:
1319:
1318:
1317:
1314:
1310:
1307:
1305:
1302:
1301:
1300:
1297:
1295:
1292:
1290:
1287:
1285:
1282:
1280:
1277:
1275:
1272:
1270:
1267:
1265:
1262:
1260:
1257:
1255:
1252:
1250:
1247:
1245:
1242:
1240:
1237:
1235:
1232:
1230:
1227:
1226:
1224:
1221:
1217:
1213:
1207:
1206:3200 Phaethon
1204:
1201:
1192:
1189:
1180:
1177:
1168:
1165:
1156:
1153:
1144:
1141:
1132:
1130:
1129:3122 Florence
1127:
1124:
1115:
1112:
1103:
1100:
1091:
1088:
1079:
1076:
1067:
1064:
1055:
1052:
1043:
1041:
1038:
1037:
1035:
1033:
1028:
1022:
1019:
1017:
1014:
1013:
1011:
1009:
1008:Impact events
1005:
1000:
994:
988:
977:
974:
973:
971:
968:
964:
960:
951:
944:
938:
937:
934:
930:2017 in space
925:
920:
918:
913:
911:
906:
905:
902:
894:
890:
886:
882:
878:
877:Orbit diagram
874:
870:
866:
862:
858:
854:
851:
849:
848:
843:
840:
839:
835:
819:
815:
808:
805:
792:
788:
782:
779:
766:
762:
756:
753:
741:
740:
735:
728:
725:
713:
712:
707:
700:
698:
696:
694:
692:
690:
686:
674:
673:
668:
662:
660:
656:
644:
640:
634:
632:
630:
628:
626:
624:
622:
618:
604:
600:
594:
592:
588:
581:
568:
564:
554:
552:
548:
544:
540:
525:
523:
521:
517:
513:
509:
496:2017 approach
495:
493:
491:
489:
483:
472:
470:
466:
462:
458:
454:
450:
449:extinct comet
436:
434:
432:
428:
424:
420:
419:extinct comet
416:
412:
398:
394:
391:
390:
383:
378:
372:
369:
364:
360:
357:
356:Mean diameter
352:
349:
345:
340:
334:
332:
325:
321:
319:
316:Jupiter
314:
310:
306:
304:
299:
295:
292:
287:
283:
280:
275:
271:
269:
265:
261:
258:
253:
250:
246:
243:
238:
234:
230:
227:
222:
218:
216:
212:
208:
205:
200:
196:
194:
190:
187:
183:
181:
177:
173:
171:
167:
163:
159:
155:
151:
147:
144:
140:
136:
132:
128:
124:
120:
116:
113:
108:
99:
96:
91:
86:
78:
74:
71:
68:
66:
62:
59:
56:
54:
50:
45:
32:
27:
16:
1894:Solar system
1843:Space debris
1559:
1516:
1500:96P/Machholz
1490:P/2006 VW139
1471:103P/Hartley
1081:
888:
880:
872:
864:
856:
845:
821:. Retrieved
817:
807:
795:. Retrieved
791:the original
781:
769:. Retrieved
765:the original
755:
743:. Retrieved
737:
727:
715:. Retrieved
709:
676:. Retrieved
670:
646:. Retrieved
607:. Retrieved
555:
529:
499:
485:
473:
440:
431:Apollo group
405:
404:
388:
242:Mean anomaly
235:(1,777 days)
215:Eccentricity
130:
122:
88:Designations
69:
15:
1833:Cosmic dust
1797:Long-period
1787:Halley-type
1743:Kuiper belt
1628:Designation
1480:(PanSTARRS)
1378:Discoveries
1234:HD 113996 b
745:31 December
717:29 December
437:Description
301:Earth
268:Inclination
257:Mean motion
70:Earth orbit
1904:Categories
1838:Meteoroids
1817:Sungrazing
1792:Hyperbolic
1748:Oort cloud
1691:Near-Earth
1525:OSIRIS-REx
1519:retirement
1440:RZ Piscium
1316:TRAPPIST-1
1294:Ross 128 b
1269:LHS 1140 b
1254:Kepler-90i
1249:Kepler-80g
1244:Kepler-19d
1216:Exoplanets
797:2 February
771:2 February
678:8 February
667:"2016 WF9"
648:8 February
609:2 February
582:References
486:(also see
193:Perihelion
174:(192 days)
156:2458000.5)
1870:Astronomy
1728:Damocloid
1476:C/2015 ER
1430:ʻOumuamua
1353:WASP-107b
1030:Selected
869:Ephemeris
861:Discovery
823:9 January
615:(K16W09F)
570:Orbit of
526:Discovery
469:volatiles
373:<0.05
322:0.5211 AU
209:2.8715 AU
197:0.9816 AU
47:Discovery
1812:Periodic
1738:Detached
1658:Asteroid
1449:Comets
1422:GW170817
1411:GW170814
1401:GW170608
1385:GW170104
1348:WASP-12b
1299:Tau Ceti
1274:Luyten b
1239:KELT-18b
1229:HATS-36b
953: »
842:2016 WF9
465:cometary
415:asteroid
180:Aphelion
1882:Science
1856:Portals
1777:Extinct
1716:Centaur
1517:Cassini
1358:YZ Ceti
1279:NGTS-1b
1264:K2-138b
1195:2017 XO
1183:2017 VW
1171:2017 VL
1159:2017 TD
1147:2012 TC
1135:2017 SX
1118:2017 QP
1106:2017 OO
1094:2014 JO
1082:2016 WF
1070:2017 BQ
1058:2017 BS
1046:2017 AG
976:ASTERIA
940:«
844:at the
572:2016 WF
558:2016 WF
551:Jupiter
532:2016 WF
506:passed
501:2016 WF
475:2016 WF
457:NEOWISE
442:2016 WF
429:of the
407:2016 WF
330:Jupiter
296:342.45°
284:125.41°
272:14.995°
184:4.7614
101:2016 WF
58:NEOWISE
37:2016 WF
20:2016 WF
1769:Comets
1681:Family
1666:Active
1633:Groups
1344:albedo
1259:K2-66b
889:·
887:
881:·
879:
873:·
871:
865:·
863:
857:·
855:
341:-like)
335:2.893
247:43.511
219:0.6582
135:Apollo
131:·
129:
123:·
121:
1826:Other
1782:Great
1342:dark
891:
883:
875:
867:
859:
530:When
508:Earth
453:comet
339:comet
231:4.87
150:Epoch
133:
125:
1802:Lost
1643:Moon
1638:List
1032:NEOs
950:2018
943:2016
825:2017
799:2017
773:2017
747:2016
719:2016
711:NASA
680:2018
650:2018
611:2017
461:WISE
425:and
395:20.2
377:dark
318:MOID
303:MOID
1346:of
389:(H)
127:PHA
119:NEO
1906::
1564:—
1558:—
1478:61
1394:2
1186:13
1138:17
1097:25
1049:13
816:.
736:.
708:.
688:^
669:.
658:^
620:^
601:.
590:^
553:.
520:mi
516:km
512:AU
492:.
433:.
309:LD
233:yr
186:AU
154:JD
1858::
1600:e
1593:t
1586:v
1368:d
1365:c
1362:b
1336:h
1331:g
1326:f
1321:e
1309:h
1304:g
1198:2
1174:2
1162:6
1150:4
1121:1
1109:1
1085:9
1073:6
1061:5
923:e
916:t
909:v
827:.
801:.
775:.
749:.
721:.
682:.
652:.
613:.
574:9
560:9
534:9
503:9
490:)
477:9
444:9
409:9
379:)
375:(
337:(
328:T
311:)
249:°
164:4
103:9
39:9
22:9
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
