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Sentry (monitoring system)

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over the next 100+ years. Whenever a potential impact is detected, it will be analyzed and the results immediately published by CNEOS. However, alerts do not imply certainty about future impacts, as the small amounts of optical data that can trigger an alert are not enough to conclusively identify an
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Scientists warn against worrying about the possibility of impact with an object based on only a few weeks of optical data that show a possible Earth encounter years from now. Sometimes, it cannot even be said for certain what side of the Sun such an object will be at the time of the listed virtual
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that can significantly change a small asteroids path over decades and centuries. Sentry-II defaults to an Impact Pseudo-Observation (IOBS) analysis technique that runs an extended orbit-determination filter that tries to converge to an impacting solution compatible with the observational data.
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There are 1620 near-Earth asteroids listed in the risk table and 37,736 virtual impact dates, so for each asteroid in the risk table, there is an average of about 23 virtual impact dates. Only about 19 objects in the table are large enough, with a diameter greater than about 140 meters, to be
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with designations that are user-assigned and unofficial as they have not been confirmed by additional observations. The impact risk assessment is rated on a scale of 0–4 (negligible, small, modest, moderate, or elevated). Scout is used to help identify imminent impactors.
1006:"Negligible" (0) is for objects where no impacting solution was identified. "Small" (1) is for objects with a <0.1% chance of impact. "Modest" (2) is for a 0.1-1% chance. "Moderate" (3) is for a 1-10% chance, and "Elevated" (4) is for a >10% chance of impact. 1095: 1243: 1265: 897:
of which roughly 1,620 near-Earth asteroids are listed on the risk table. Only around 19 objects on the risk table are large enough to qualify as potentially hazardous objects with a diameter greater than 140 meters
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brighter than 22). About 99% of the objects on the risk table are less than roughly 140 meters in diameter. Roughly 1,200 of these risk-listed near-Earth asteroids are estimated to be about the size of the
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had a 1-in-500,000 chance of impacting Earth on 11 March 2023, its most likely position at that date was farther away than the Sun. Most objects in the Sentry Risk Table have an
907:(H>26), which killed no one but had 1,491 non-direct injuries; or smaller. More than 3,140 asteroids have been removed from the risk table since it launched in 2002. 852: 836: 1761: 2072: 1776: 1484: 824:(H). Their mass, consequently, is uncertain by about a factor of 10. For near-Earth asteroids without a well-determined diameter, Sentry assumes a generic 780:(4-meters in diameter) with less than a 1-day observation arc. It had a 1:53,000 chance of impact on 10 June 2023, but was expected to be around 0.6  1595: 967: 1796: 930:
uncertainty. Sentry computations explore alternate orbit solutions along the line of variations and account for orbit propagation nonlinearities.
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with their very short 1-day observation arcs have missed virtual impactor dates as they were likely quite distant from the Earth at the time.
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chance of impact. It is estimated to be 120-meters in diameter, has a short observation arc of 3.1-days, and is expected to be 1.78 
2062: 1836: 939: 103:. The average size of an object on the default page of Sentry is 120 meters, with an average impact probability of about 1 in 500. More 72:
impact years in the future. In contrast, eliminating an entry on the risk page is a negative prediction (a prediction of where it will
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The soonest virtual impactor of an asteroid larger than 50 meters in diameter with a better than 1:1-million chance of impact is
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is the asteroid with greatest probability (10%) of impacting Earth, but is only ~7 meters in diameter. The only
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JPL launched major changes to the website in February 2017 and re-directed the classic page on 10 April 2017.
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which had been less than 1:1-billion. The switch to DE441 also briefly added in the harmless Jupiter trojan
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that are, for all practical purposes, permanent residents of the risk page; their removal may depend upon a
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of less than 14 days, making their positions highly uncertain, and have not been observed for years.
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The only two comets that briefly appeared on the Sentry Risk Table are 197P/LINEAR (2003 KV2) and
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RNG_3sigma = uncertainty range in km. (JPL#4/Soln.date: 2021-Apr-15 generates RNG_3sigma =
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and better than 1:1 million also include Impact Probability ≥ 1e-6 and H≤26 (17–38 meters).
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Sentry's little brother Scout scans recently detected objects on the Minor Planet Center's
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can generally only be estimated within about a factor of 2 based on the asteroid's
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Of the 160 asteroids with better than a 1-in-10,000 chance of impacting Earth only
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objects for which all previously detected potential impacts have been eliminated
1361: 520: 1413: 1322: 1147: 1872: 1831: 1811: 1806: 1714: 1457: 1388: 1244:"JPL Horizons: 2022 PX1 geocentric distance and uncertainty on 11 August 2040" 695: 662: 581: 566: 396: 227: 82: 1913: 1688: 1682: 1547: 1542: 1216: 977: 927: 860: 856: 832: 785: 759: 706: 684: 673: 651: 629: 594: 576: 540: 296: 171: 1146:. NASA/JPL Near-Earth Object Program Office. 31 August 2005. Archived from 29:
JPL program to monitor the Minor Planet Center's catalog for Earth impacts
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The diameter of most near-Earth asteroids that have not been studied by
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The asteroid with the greatest chance of impacting Earth in 2023 is
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Objects with better than a 1/500 (0.2%) cumulative chance of impact
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risk corridor for the obsolete virtual impactor of 12 October 2033.
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Unconstrained Settings, Sort by Date. For objects larger than the
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perturber ephemeris: SB431-BIG16) better models the gravitational
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has the most virtual impactors with 1244 virtual impactor dates.
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asteroid in 2014. Some objects on the Sentry Risk Table, such as
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In August 2013, the Sentry Risk Table started using planetary
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which removed the very low impact probability of short-arc
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with a very low impact probability of about 1:1-billion.
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was serendipitously rediscovered in 2006 after being
1930: 1896: 1845: 1751: 1624: 1566: 1500: 1072:. Columbine, Inc. (hohmanntransfer). Archived from 893:As of September 2023, there are over 32,955 869:In 2021 JPL launched Sentry-II which handles the 527:has been on the list since the list's inception. 1266:"Horizons Batch for 2023-06-10 Virtual Impactor" 847:of the planets and includes the 16 most massive 67:catalog for possibilities of future impact with 122:at velocities of ~40 km/s (25 mi/s). 63:. It continually monitors the most up-to-date 1478: 1364:. NASA/JPL Near-Earth Object Program Office. 8: 1458:Scout: NEOCP Hazard Assessment: Introduction 1033: 1031: 1029: 1027: 1025: 1023: 1391:. NASA/JPL Near-Earth Object Program Office 1219:. NASA/JPL Near-Earth Object Program Office 1041:. NASA/JPL Near-Earth Object Program Office 839:) for all NEO orbit determinations. DE431 ( 51:system started in 2002 and operated by the 1485: 1471: 1463: 1448:Asteroid Hazards, Part 3: Finding the Path 1356: 1354: 1063: 1061: 1059: 1057: 968:List of asteroid close approaches to Earth 129: 1378:(Search for "P/" to list comets removed.) 1144:"IMPACT RISK ASSESSMENT: AN INTRODUCTION" 1317: 1315: 851:. In April 2021, Sentry transitioned to 80:impactor date. For example, even though 1965: 1121:(using 2022-Sep-13 solution). NASA JPL 1019: 999: 515:The Impact Risk page lists a number of 1096:"2005ED224 Ephemerides for March 2023" 737:is larger than 50 meters in diameter. 1888:Planetary Defense Coordination Office 1883:Space Situational Awareness Programme 1368:from the original on 25 February 2017 1309:(1244 VIs) using 2022-Aug-30 solution 1211: 1209: 114:) that extend to nearly the orbit of 7: 1276:from the original on 9 November 2022 53:Center for Near Earth Object Studies 1170:"2002 Archive of Sentry Risk Table" 940:Near-Earth Object Confirmation Page 2073:Space program of the United States 25: 2040: 2028: 2016: 2004: 1992: 1980: 1968: 1389:"Scout: NEOCP Hazard Assessment" 973:List of Earth-crossing asteroids 575:was determined to be a harmless 888:potentially hazardous asteroids 802:With a 24-day observation arc, 1419:Sentry: Impact Risk Data table 1119:"Sentry Risk Table: 2015 RD36" 1: 1068:Jon Giorgini (30 July 2002). 926:close approach table lists a 101:potentially hazardous objects 1858:Japan Spaceguard Association 1601:Earth-crossing minor planets 1558:Potentially hazardous object 1217:"VI (Virtual Impactor) Data" 590:, might even be artificial. 1948:Fiction about impact events 1188:"Much Ado about 2000 SG344" 747:on 11 August 2040 with a 1: 523:rediscovery. Lost asteroid 2094: 2063:Near-Earth object tracking 1070:"Understanding Risk Pages" 953:Asteroid impact prediction 1878:The Spaceguard Foundation 1596:Asteroid close approaches 1574:Asteroid impact avoidance 61:Jet Propulsion Laboratory 1943:Fiction about meteoroids 1822:Sentinel Space Telescope 1439:Sormano Observatory TECA 886:Plot of orbits of known 1579:Asteroid laser ablation 924:JPL Small-Body Database 758:(266 million  564:for more than 8 years. 1518:Earth-grazing fireball 958:Earth-grazing fireball 890: 784:(90 million  766:uncertainty region of 41: 988:Time-domain astronomy 885: 611:of several years are 35: 1863:Meteoritical Society 1414:Sentry: Introduction 18:Scout (NASA program) 2078:JPL online services 1767:Catalina Sky Survey 1452:Minor Planet Center 1039:"Sentry Risk Table" 918:JPL SBDB comparison 849:main-belt asteroids 132: 1931:Related categories 1231:Chelyabinsk meteor 1076:on 8 December 2002 905:Chelyabinsk meteor 900:absolute magnitude 895:near-Earth objects 891: 822:absolute magnitude 517:lost minor planets 130: 42: 2068:Planetary defense 1956: 1955: 1897:Potential threats 1589:Ion-beam shepherd 1553:Near-Earth object 1533:Meteor procession 1494:Planetary defense 1435:ESA NEO Risk List 1362:"Removed Objects" 1307:Sentry: 2017 SA20 1297:for 2023-Jun-10.) 1176:on 21 March 2002. 513: 512: 126:Sentry Risk Table 120:atmospheric entry 49:impact prediction 16:(Redirected from 2085: 2045: 2044: 2033: 2032: 2031: 2021: 2020: 2019: 2009: 2008: 2007: 1997: 1996: 1985: 1984: 1983: 1973: 1972: 1964: 1528:Meteor air burst 1487: 1480: 1473: 1464: 1401: 1400: 1398: 1396: 1385: 1379: 1377: 1375: 1373: 1358: 1349: 1348: 1341: 1335: 1334: 1332: 1330: 1319: 1310: 1304: 1298: 1296: 1294: 1291: 1285: 1283: 1281: 1262: 1256: 1255: 1253: 1251: 1240: 1234: 1228: 1226: 1224: 1213: 1204: 1203: 1201: 1199: 1184: 1178: 1177: 1172:. Archived from 1166: 1160: 1159: 1157: 1155: 1150:on 19 April 2002 1140: 1134: 1133: 1131: 1129: 1115: 1109: 1107: 1105: 1103: 1092: 1086: 1085: 1083: 1081: 1065: 1052: 1050: 1048: 1046: 1035: 1007: 1004: 871:Yarkovsky effect 808: 798: 796: 795: 779: 769: 768:± 240 million km 753: 752: 746: 729: 727: 726: 714: 712: 711: 703: 701: 700: 692: 690: 689: 681: 679: 678: 670: 668: 667: 659: 657: 656: 648: 646: 645: 637: 635: 634: 625:(410777) 2009 FD 609:observation arcs 602: 600: 599: 589: 587: 586: 574: 572: 571: 559: 557: 556: 548: 546: 545: 537: 535: 534: 497: 475: 455: 432: 430: 429: 404: 402: 401: 376: 374: 373: 349: 327: 304: 302: 301: 277: 258: 235: 233: 232: 207: 205: 204: 179: 177: 176: 133: 113: 107:orbits (such as 90: 88: 87: 47:is an automated 21: 2093: 2092: 2088: 2087: 2086: 2084: 2083: 2082: 2053: 2052: 2051: 2039: 2029: 2027: 2017: 2015: 2005: 2003: 1991: 1981: 1979: 1967: 1959: 1957: 1952: 1926: 1917: 1892: 1853:B612 Foundation 1841: 1747: 1620: 1584:Gravity tractor 1562: 1496: 1491: 1443:Simplified List 1429:Similar lists: 1410: 1405: 1404: 1394: 1392: 1387: 1386: 1382: 1371: 1369: 1360: 1359: 1352: 1343: 1342: 1338: 1328: 1326: 1321: 1320: 1313: 1305: 1301: 1292: 1289: 1287: 1279: 1277: 1264: 1263: 1259: 1249: 1247: 1242: 1241: 1237: 1222: 1220: 1215: 1214: 1207: 1197: 1195: 1186: 1185: 1181: 1168: 1167: 1163: 1153: 1151: 1142: 1141: 1137: 1127: 1125: 1117: 1116: 1112: 1101: 1099: 1094: 1093: 1089: 1079: 1077: 1067: 1066: 1055: 1044: 1042: 1037: 1036: 1021: 1016: 1011: 1010: 1005: 1001: 996: 949: 936: 920: 880: 807: 803: 793: 792: 789: 778: 774: 767: 750: 748: 745: 741: 724: 723: 720: 709: 708: 705: 698: 697: 694: 687: 686: 683: 676: 675: 672: 665: 664: 661: 654: 653: 650: 643: 642: 639: 632: 631: 628: 613:(29075) 1950 DA 597: 596: 593: 584: 583: 580: 569: 568: 565: 554: 553: 550: 543: 542: 539: 532: 531: 528: 496: 492: 473: 451: 427: 426: 423: 399: 398: 395: 371: 370: 367: 348: 344: 326: 322: 299: 298: 295: 275: 257: 253: 230: 229: 226: 202: 201: 198: 174: 173: 170: 163: 160: 154: 152: 147: 142: 140: 128: 112: 108: 93:observation arc 85: 84: 81: 30: 23: 22: 15: 12: 11: 5: 2091: 2089: 2081: 2080: 2075: 2070: 2065: 2055: 2054: 2050: 2049: 2037: 2025: 2013: 2001: 1989: 1977: 1954: 1953: 1951: 1950: 1945: 1940: 1934: 1932: 1928: 1927: 1925: 1924: 1919: 1915: 1911: 1906: 1900: 1898: 1894: 1893: 1891: 1890: 1885: 1880: 1875: 1870: 1865: 1860: 1855: 1849: 1847: 1843: 1842: 1840: 1839: 1834: 1829: 1824: 1819: 1814: 1809: 1804: 1799: 1794: 1789: 1784: 1779: 1774: 1769: 1764: 1758: 1756: 1749: 1748: 1746: 1745: 1738: 1737: 1736: 1722: 1717: 1712: 1705: 1700: 1697:NEAR Shoemaker 1693: 1692: 1691: 1679: 1672: 1667: 1666: 1665: 1658: 1648: 1643: 1636: 1628: 1626: 1622: 1621: 1619: 1618: 1617: 1616: 1611: 1605:Damage scales 1603: 1598: 1593: 1592: 1591: 1586: 1581: 1570: 1568: 1564: 1563: 1561: 1560: 1555: 1550: 1545: 1540: 1535: 1530: 1525: 1520: 1515: 1510: 1504: 1502: 1498: 1497: 1492: 1490: 1489: 1482: 1475: 1467: 1461: 1460: 1455: 1445: 1431:NEODyS CLOMON2 1427: 1421: 1416: 1409: 1408:External links 1406: 1403: 1402: 1380: 1350: 1336: 1323:"Sentry Notes" 1311: 1299: 1257: 1246:. JPL Horizons 1235: 1205: 1179: 1161: 1135: 1110: 1087: 1053: 1018: 1017: 1015: 1012: 1009: 1008: 998: 997: 995: 992: 991: 990: 985: 980: 975: 970: 965: 960: 955: 948: 945: 935: 932: 919: 916: 879: 876: 841:JPL small-body 805: 776: 743: 511: 510: 507: 504: 501: 498: 494: 489: 488: 485: 482: 479: 476: 470: 469: 466: 463: 460: 457: 447: 446: 443: 440: 437: 434: 419: 418: 415: 412: 409: 406: 391: 390: 387: 384: 381: 378: 363: 362: 359: 356: 353: 350: 346: 341: 340: 337: 334: 331: 328: 324: 319: 318: 315: 312: 309: 306: 291: 290: 287: 284: 281: 278: 272: 271: 268: 265: 262: 259: 255: 250: 249: 246: 243: 240: 237: 222: 221: 218: 215: 212: 209: 194: 193: 190: 187: 184: 181: 166: 165: 156: 149: 148:Greatest Risk 144: 137: 127: 124: 110: 28: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2090: 2079: 2076: 2074: 2071: 2069: 2066: 2064: 2061: 2060: 2058: 2048: 2043: 2038: 2036: 2026: 2024: 2014: 2012: 2002: 2000: 1995: 1990: 1988: 1978: 1976: 1971: 1966: 1962: 1949: 1946: 1944: 1941: 1939: 1938:Impact events 1936: 1935: 1933: 1929: 1923: 1922:99942 Apophis 1920: 1918: 1912: 1910: 1907: 1905: 1902: 1901: 1899: 1895: 1889: 1886: 1884: 1881: 1879: 1876: 1874: 1871: 1869: 1866: 1864: 1861: 1859: 1856: 1854: 1851: 1850: 1848: 1846:Organizations 1844: 1838: 1835: 1833: 1830: 1828: 1825: 1823: 1820: 1818: 1815: 1813: 1810: 1808: 1805: 1803: 1802:OGS Telescope 1800: 1798: 1795: 1793: 1790: 1788: 1785: 1783: 1780: 1778: 1775: 1773: 1770: 1768: 1765: 1763: 1760: 1759: 1757: 1754: 1750: 1744: 1743: 1739: 1735: 1734: 1730: 1729: 1728: 1727: 1723: 1721: 1718: 1716: 1713: 1711: 1710: 1706: 1704: 1701: 1699: 1698: 1694: 1690: 1687: 1686: 1685: 1684: 1680: 1678: 1677: 1673: 1671: 1670:Halley Armada 1668: 1664: 1663: 1659: 1657: 1654: 1653: 1652: 1649: 1647: 1644: 1642: 1641: 1637: 1635: 1634: 1630: 1629: 1627: 1623: 1615: 1612: 1610: 1609:Palermo scale 1607: 1606: 1604: 1602: 1599: 1597: 1594: 1590: 1587: 1585: 1582: 1580: 1577: 1576: 1575: 1572: 1571: 1569: 1565: 1559: 1556: 1554: 1551: 1549: 1546: 1544: 1541: 1539: 1538:Meteor shower 1536: 1534: 1531: 1529: 1526: 1524: 1521: 1519: 1516: 1514: 1511: 1509: 1506: 1505: 1503: 1499: 1495: 1488: 1483: 1481: 1476: 1474: 1469: 1468: 1465: 1459: 1456: 1453: 1449: 1446: 1444: 1440: 1436: 1432: 1428: 1426: 1422: 1420: 1417: 1415: 1412: 1411: 1407: 1390: 1384: 1381: 1367: 1363: 1357: 1355: 1351: 1346: 1340: 1337: 1324: 1318: 1316: 1312: 1308: 1303: 1300: 1275: 1271: 1267: 1261: 1258: 1245: 1239: 1236: 1232: 1218: 1212: 1210: 1206: 1193: 1189: 1183: 1180: 1175: 1171: 1165: 1162: 1149: 1145: 1139: 1136: 1124: 1120: 1114: 1111: 1097: 1091: 1088: 1075: 1071: 1064: 1062: 1060: 1058: 1054: 1040: 1034: 1032: 1030: 1028: 1026: 1024: 1020: 1013: 1003: 1000: 993: 989: 986: 984: 981: 979: 976: 974: 971: 969: 966: 964: 961: 959: 956: 954: 951: 950: 946: 944: 941: 933: 931: 929: 925: 917: 915: 913: 912:300P/Catalina 908: 906: 901: 896: 889: 884: 877: 875: 872: 867: 864: 862: 858: 854: 850: 846: 845:perturbations 842: 838: 834: 829: 827: 823: 819: 815: 810: 800: 797: 787: 783: 771: 765: 761: 757: 738: 736: 731: 728: 718: 717:367943 Duende 713: 702: 691: 680: 669: 658: 647: 636: 626: 622: 621:99942 Apophis 618: 614: 610: 607:objects with 606: 601: 591: 588: 578: 573: 563: 558: 547: 536: 526: 522: 521:serendipitous 518: 508: 505: 502: 499: 491: 490: 486: 483: 480: 477: 472: 471: 467: 464: 461: 458: 456: 454: 449: 448: 444: 441: 438: 435: 433: 431: 421: 420: 416: 413: 410: 407: 405: 403: 393: 392: 388: 385: 382: 379: 377: 375: 365: 364: 360: 357: 354: 351: 343: 342: 338: 335: 332: 329: 321: 320: 316: 313: 310: 307: 305: 303: 293: 292: 288: 285: 282: 279: 274: 273: 269: 266: 263: 260: 252: 251: 247: 244: 241: 238: 236: 234: 224: 223: 219: 216: 213: 210: 208: 206: 196: 195: 191: 188: 185: 182: 180: 178: 168: 167: 162: 157: 150: 145: 138: 135: 134: 125: 123: 121: 117: 106: 102: 96: 94: 89: 77: 75: 70: 66: 62: 58: 54: 50: 46: 39: 34: 27: 19: 2035:Solar System 1909:101955 Bennu 1826: 1792:NEO Surveyor 1740: 1731: 1724: 1709:New Horizons 1707: 1695: 1681: 1674: 1661: 1638: 1631: 1625:Space probes 1614:Torino scale 1523:Impact event 1393:. Retrieved 1383: 1370:. Retrieved 1339: 1327:. Retrieved 1302: 1278:. Retrieved 1270:JPL Horizons 1260: 1248:. Retrieved 1238: 1221:. Retrieved 1198:27 September 1196:. Retrieved 1192:NASA Science 1191: 1182: 1174:the original 1164: 1152:. Retrieved 1148:the original 1138: 1126:. Retrieved 1113: 1100:. Retrieved 1090: 1078:. Retrieved 1074:the original 1043:. Retrieved 1002: 963:Impact event 937: 921: 914:(2005 JQ5). 909: 892: 868: 865: 830: 811: 801: 772: 739: 735:101955 Bennu 732: 617:101955 Bennu 592: 514: 450: 422: 394: 366: 294: 225: 197: 169: 143:Probability 97: 78: 73: 44: 43: 26: 2023:Outer space 2011:Spaceflight 1640:Deep Impact 1501:Main topics 1372:16 February 1080:21 November 159:Observation 99:considered 55:(CNEOS) at 2057:Categories 1873:Spaceguard 1832:Spacewatch 1812:Pan-STARRS 1807:Orbit@home 1715:OSIRIS-REx 1454:on YouTube 1280:9 November 1223:9 November 1154:14 October 1014:References 928:linearized 503:2094-05-27 481:2079-06-10 462:2056-10-11 439:2024-12-17 411:2071-09-16 383:2075-12-03 355:2035-09-17 333:2070-02-03 311:2074-05-03 283:2074-11-02 264:2104-11-24 242:2044-02-08 214:2082-09-09 186:2095-09-05 139:Cumulative 1987:Astronomy 1868:NEOShield 1703:NEA Scout 1683:Hayabusa2 1548:Meteoroid 1543:Meteorite 1128:2 October 978:Meteoroid 861:2014 ES57 857:2014 MV67 833:ephemeris 828:of 0.15. 577:main belt 155:(meters) 151:Estimated 118:can make 105:eccentric 36:Asteroid 1755:tracking 1742:Stardust 1676:Hayabusa 1508:Asteroid 1423:List of 1366:Archived 1329:13 April 1295: km 1274:Archived 1250:15 March 1102:26 March 1045:13 April 947:See also 818:infrared 605:numbered 153:Diameter 65:asteroid 38:2020 VV 2047:Science 1975:Physics 1961:Portals 1914:2010 RF 1904:1950 DA 1797:NEOSSat 1726:Rosetta 1720:PROCYON 1567:Defense 1395:26 June 878:Numbers 804:2017 SA 791:2008 TC 775:2016 LP 764:3-sigma 742:2022 PX 722:2011 AG 707:2011 BT 696:2013 TV 685:2008 CK 674:2013 BP 663:2007 VK 652:1994 WR 641:2017 XO 630:2006 QV 595:2010 RF 582:2000 SG 567:2004 BX 552:1997 XR 541:2014 MV 530:2007 FT 525:1979 XB 493:2000 LG 474:2017 LD 453:2020 VV 425:2022 YO 397:2000 SG 369:2022 NX 345:2022 SX 323:2020 CQ 297:2006 JY 276:2020 VW 254:2017 WT 228:2006 RH 200:2020 CD 172:2010 RF 164:(days) 146:Date of 136:Object 116:Jupiter 109:2015 RD 83:2005 ED 1827:Sentry 1787:NEODyS 1777:LONEOS 1772:LINEAR 1733:Philae 1689:MASCOT 1646:HAMMER 1513:Bolide 1194:. NASA 983:NEODyS 826:albedo 719:, and 141:Impact 45:Sentry 1999:Stars 1762:ATLAS 1123:CNEOS 994:Notes 934:Scout 853:DE441 837:DE431 814:radar 500:0.21% 478:0.22% 459:0.23% 436:0.23% 408:0.27% 380:0.32% 352:0.40% 330:0.46% 308:0.50% 280:0.70% 192:4374 76:be). 69:Earth 1837:WISE 1817:SCAP 1782:NEAT 1662:DART 1656:Hera 1651:AIDA 1633:Dawn 1397:2019 1374:2017 1331:2017 1282:2021 1252:2023 1225:2022 1200:2023 1156:2011 1130:2022 1104:2021 1082:2011 1047:2017 922:The 615:and 562:lost 538:and 417:507 389:142 261:1.2% 248:281 239:1.3% 220:742 211:2.5% 57:NASA 1753:NEO 1293:335 1290:116 1288:134 816:or 751:000 749:330 699:135 666:184 585:344 570:159 487:45 468:61 400:344 339:29 289:14 270:19 231:120 183:10% 161:arc 86:224 74:not 59:'s 2059:: 1916:12 1450:– 1441:/ 1437:/ 1433:/ 1353:^ 1314:^ 1272:. 1268:. 1208:^ 1190:. 1056:^ 1022:^ 806:20 799:. 786:km 782:AU 777:10 770:. 760:km 756:AU 730:. 715:, 710:15 704:, 693:, 688:70 682:, 677:73 671:, 660:, 655:12 649:, 638:, 633:89 627:, 623:, 598:12 544:67 509:2 484:11 465:12 445:1 414:37 361:1 347:55 317:3 300:26 256:28 175:12 111:36 1963:: 1486:e 1479:t 1472:v 1399:. 1376:. 1333:. 1284:. 1254:. 1227:. 1202:. 1158:. 1132:. 1106:. 1084:. 1049:. 898:( 835:( 794:3 744:1 725:5 644:2 555:2 533:3 506:5 495:6 442:3 428:1 386:8 372:1 358:3 336:6 325:1 314:7 286:7 267:8 245:4 217:2 203:3 189:7 20:)

Index

Scout (NASA program)

2020 VV
impact prediction
Center for Near Earth Object Studies
NASA
Jet Propulsion Laboratory
asteroid
Earth
2005 ED224
observation arc
potentially hazardous objects
eccentric
Jupiter
atmospheric entry
Observation
arc

2010 RF12
2020 CD3
2006 RH120
2006 JY26
2022 NX1
2000 SG344
2022 YO1
2020 VV
lost minor planets
serendipitous
1979 XB
2007 FT3
2014 MV67
1997 XR2

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