1624:
875:
807:
819:
616:
890:
45:
792:
2049:
2073:
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2037:
723:'s loop is so elongated that it sometimes travels nearly to the opposite side of the Sun with respect to Earth. Its movements do not bring it any closer to Earth than 20 million kilometers (12.4 million miles), which is more than 50 times the distance to the
1401:
1027:'s position relative to Earth is actually a complicated, tightly coiled spiral; however, if its average position relative to Earth over a year is represented by a single point, that point will follow the tadpole loop.
671:
of 365.389 days, close to Earth's 365.256 days. As long as it remains in 1:1 resonance with Earth, its average period over long time intervals will exactly equal that of Earth. On its
916:
Because Earth trojans share Earth's orbit and have little gravity of their own, less energy might be needed to reach them than the Moon, even though they are much more distant. However,
1758:
1698:
2118:
2093:
923:
is not an energetically attractive target for a space mission because of its orbital inclination: It moves so far above and below Earth's orbit that the required
593:, its orbit was evaluated on 21 May 2011 and the trojan character of its motion was published in July 2011. The orbital information was published in the journal
927:
for a spacecraft to match its trajectory coming from Earth's would be 9.4 km/s, whereas some other near-Earth asteroids require less than 4 km/s.
1103:
625:'s spiraling path (green) relative to Earth and its orbit (blue dots) over the course of half a tadpole loop; each spiral turn represents a year's motion
356:
1458:
1719:
1751:
590:
585:'s orbit is normally difficult from the ground, because their potential locations are generally in the daytime sky. After follow-up work at the
1473:
1691:
1568:
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973:
2103:
563:
552:
346:
78:
58:
1744:
581:
in
October 2010 while carrying out a program to scan the entire sky from January 2010 to February 2011. Spotting an asteroid sharing
1875:
1684:
73:
322:
643:
of 0.1, its estimated diameter is about 300 meters. No spectral data are yet available to shed light on its composition.
1807:
230:
1447:
1966:
600:
2015:
2113:
1645:
1792:
1956:
1946:
747:
character, making long-range predictions difficult. Prior to 500 AD, it may have been oscillating about the L
1951:
86:
1343:
1787:
1214:
797:
706:
153:
116:
491:. In reality, they oscillate around such a point. Such objects had previously been observed in the orbits of
2098:
1971:
1855:
1767:
1618:
1598:
1379:
1244:
1046:
472:
440:
364:
263:
259:
219:
201:
2108:
1892:
1606:
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968:
1531:
1499:
1491:
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1707:
695:
334:
183:
1555:
1547:
1539:
1523:
1515:
1507:
1482:
874:
806:
1582:
1574:
771:
are also possible. Newer calculations based on an improved orbit determination confirm these results.
1865:
1315:
1141:
672:
604:
586:
241:
1562:
818:
2077:
1463:
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893:
452:
311:
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1191:
1653:
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1802:
1157:
1130:
Connors, Martin; Wiegert, Paul; Veillet, Christian (27 July 2011). "Earth's Trojan asteroid".
931:
687:
639:
of luminosity (determinable because of its known location) of about 20.8. Based on an assumed
488:
207:
171:
2029:
1976:
1323:
1149:
1132:
897:
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571:
530:
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has a diameter of about 300 meters (1,000 ft). Its path oscillates about the Sun–Earth
476:
464:
382:
164:
1637:
1629:
976:, the naming convention used for astronomical objects immediately following their discovery
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1375:
768:
567:
504:
191:
91:
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1319:
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1145:
734:
was at the near-Earth end of its tadpole in 2010–2011, which facilitated its discovery.
1912:
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1845:
1623:
668:
538:
524:
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496:
292:
252:
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791:
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1936:
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1296:"Transient Terrestrial Trojans: Comparative Short-term Dynamical Evolution of 2010 TK
1169:
909:
702:
607:
and
Christian Veillet, the executive director of the Canada–France–Hawaii Telescope.
547:
The asteroid was discovered in
October 2010 by the NEOWISE team of astronomers using
507:
480:
273:
147:
2041:
2002:
1775:
744:
615:
511:
456:
285:
142:
133:
44:
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1941:
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300:
95:
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1997:
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760:
211:
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de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (18 February 2021).
1161:
1676:
487:) 60 degrees ahead of or behind a massive orbiting body, in a type of 1:1
1817:
1426:
1348:
956:
1153:
17:
1184:"NASA's WISE Mission Finds First Trojan Asteroid Sharing Earth's Orbit"
924:
533:(60 degrees ahead of Earth), shuttling between its closest approach to
1353:
640:
751:
Lagrangian point (60 degrees behind Earth), before jumping to L
2036:
1928:
888:
873:
614:
582:
534:
460:
701:
Trojans do not orbit right at
Lagrangian points but oscillate in
939:
724:
548:
1740:
1680:
930:
During the 5 December 2012 Earth close approach of 0.197
664:
468:
709:
in which the planet and
Lagrangian points are stationary);
1423:"Trojan asteroid seen in Earth's orbit by Wise telescope"
686:'s distance from the Sun varies annually from 0.81
650:
would exert a surface gravitational force of less than
1404:. Department of Mathematics, University of Pisa, Italy
1215:"First Asteroid Companion of Earth Discovered at Last"
2013:
1020:
Because of its orbital inclination and eccentricity,
716:
traverses its loop over a period of 395 years.
479:, a dynamically stable location (where the combined
1985:
1927:
1864:
1816:
1774:
1308:
Research Notes of the
American Astronomical Society
663:At the time of discovery, the asteroid orbited the
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1344:"Found at last: First Earth companion asteroid"
1752:
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8:
32:
1083:"JPL Small-Body Database Browser: 2010 TK7"
475:are most easily conceived as orbiting at a
1780:
1759:
1745:
1737:
1699:
1685:
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1622:
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1487:NeoDyS-2, Near Earth Objects—Dynamic Site
1327:
1269:"Earth's first Trojan asteroid: 2010 TK7"
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1119:
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483:force acts through the Sun's and Earth's
2119:Astronomical objects discovered in 2010
2094:Minor planet object articles (numbered)
2020:
1038:
985:
690:to 1.19 AU. It orbits in a plane
31:
1402:"AstDyS 2010TK7 Ephemerides for 2012"
1376:"JPL Close-Approach Data: (2010 TK7)"
323:Longitude of ascending node
57:(circled in green) in image from the
7:
974:Provisional designation in astronomy
965:, the second Earth trojan discovered
611:Physical and orbital characteristics
351:0.0837911 AU (12.53497 Gm)
27:Near-Earth asteroid and Earth trojan
1627:
1378:(2011-08-03 last obs (arc=40 days;
553:Wide-field Infrared Survey Explorer
25:
1213:Choi, Charles Q. (27 July 2011).
900:(not to scale); contours around L
236:0.99972 AU (149.556 Gm)
224:0.80918 AU (121.052 Gm)
2071:
2059:
2047:
2035:
2023:
817:
805:
790:
544:point (180 degrees from Earth).
537:and its closest approach to the
1421:Amos, Jonathan (28 July 2011).
1241:"MPEC 2010-T45 : 2010 TK7"
1352:. 27 July 2011. Archived from
1239:Keys, Sonia (7 October 2010).
1190:. 27 July 2011. Archived from
1104:WayBack Machine 2013 Epoch@MPC
591:Canada–France–Hawaii Telescope
406:20.8 (when near Earth) to 23.6
1:
694:about 21 degrees to the
601:University of Western Ontario
1464:Alternate NASA animation of
1459:NASA animation of its motion
705:around them (as viewed in a
1569:space situational awareness
679: = 0.191) orbit,
335:Argument of perihelion
2135:
2104:Earth co-orbital asteroids
707:corotating reference frame
134:Minor planet category
1783:
1768:Small Solar System bodies
1714:
885:relative to Earth in 2011
574:in December 2009, imaged
425:
253:Orbital period (sidereal)
182:
170:
42:
1329:10.3847/2515-5172/abe6ad
870:Accessibility from Earth
459:discovered; it precedes
413:Absolute magnitude
357:Physical characteristics
1708:Minor planets navigator
1619:JPL Small-Body Database
1448:MPC Database entry for
1245:IAU Minor Planet Center
942:), the asteroid had an
784:orbit from 1600 to 2500
599:by Paul Wiegert of the
441:provisional designation
196:768 days (2.10 yr)
165:Orbital characteristics
1893:Trans-Neptunian object
1500:Observation prediction
969:Claimed moons of Earth
913:
886:
759:. Short-term unstable
626:
1085:(2012-11-07 last obs)
896:plot showing Earth's
892:
877:
767:, and transitions to
696:plane of the ecliptic
618:
451:) is a sub-kilometer
184:Uncertainty parameter
1866:Distant minor planet
1476:2 March 2013 at the
1356:on 24 September 2020
703:tadpole-shaped loops
605:Athabasca University
603:, Martin Connors of
587:University of Hawaii
117:MPC designation
2114:Discoveries by WISE
1670:Physical parameters
1599:Physical properties
1320:2021RNAAS...5...29D
1154:10.1038/nature10233
1146:2011Natur.475..481C
1051:Minor Planet Center
894:Effective potential
453:Near-Earth asteroid
102:Discovery date
87:Discovery site
39:
1532:Observational info
944:apparent magnitude
938:; 18,300,000
925:change in velocity
914:
887:
637:absolute magnitude
627:
401:Apparent magnitude
74:Discovered by
2011:
2010:
1923:
1922:
1808:Meanings of names
1734:
1733:
1614:(706765) 2010 TK7
1563:(706765) 2010 TK7
1483:(706765) 2010 TK7
1140:(7357): 481–483.
934:(29,500,000
898:Lagrangian points
489:orbital resonance
429:
428:
306:0° 59 9.672 / day
174:13 January 2016 (
16:(Redirected from
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1662:Orbital elements
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1047:"2010 TK7 Orbit"
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531:Lagrangian point
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477:Lagrangian point
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433:(706765) 2010 TK
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383:Geometric albedo
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178: 2457400.5)
127:
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40:
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34:(706765) 2010 TK
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1556:Orbit animation
1524:Proper elements
1478:Wayback Machine
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743:'s orbit has a
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2099:Aten asteroids
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1967:Near-parabolic
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1913:Scattered disc
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1881:Neptune trojan
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1856:Spectral types
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1846:Jupiter trojan
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1630:Close approach
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1442:External links
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1275:. 27 July 2011
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473:Trojan objects
455:and the first
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2109:Earth trojans
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946:of about 21.
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911:
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800:Sun and Earth
799:
793:
777:Animation of
772:
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762:
746:
735:
726:
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704:
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697:
693:
689:
678:
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666:
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592:
588:
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573:
569:
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550:
545:
543:
536:
532:
529:
515:
513:
509:
506:
502:
498:
494:
490:
486:
482:
481:gravitational
478:
474:
470:
466:
462:
458:
454:
450:
442:
438:
424:
420:
417:
416:
409:
405:
402:
397:
387:
384:
379:
369:
366:
365:Mean diameter
361:
358:
354:
350:
348:
343:
339:
336:
331:
327:
324:
319:
315:
313:
309:
305:
302:
297:
294:
290:
287:
282:
278:
275:
274:orbital speed
269:
265:
262:(365.10
261:
257:
254:
249:
245:
243:
239:
235:
232:
227:
223:
221:
217:
213:
210:(178.07
209:
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155:
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118:
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88:
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77:
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71:
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2078:Solar System
2003:Space debris
1718:
1665:
1657:
1649:
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1633:
1617:
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1594:
1586:
1583:Observations
1578:
1566:
1551:
1543:
1535:
1527:
1519:
1511:
1508:Orbital info
1503:
1495:
1486:
1430:. Retrieved
1406:. Retrieved
1396:
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1370:
1358:. Retrieved
1354:the original
1347:
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1273:Astro.uwo.ca
1272:
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1234:
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1192:the original
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1054:. Retrieved
1041:
1016:
1005:
1001:
993:
988:
929:
915:
910:tadpole loop
878:Position of
848:
837:
812:Around Earth
736:
700:
676:
662:
628:
594:
562:
546:
516:
457:Earth trojan
443:
431:
430:
414:
286:Mean anomaly
242:Eccentricity
206:1.1903
143:Earth trojan
110:Designations
29:
2066:Outer space
2054:Spaceflight
1993:Cosmic dust
1957:Long-period
1947:Halley-type
1903:Kuiper belt
1788:Designation
1575:Ephemerides
1492:Ephemerides
1380:Uncertainty
1300:and 2020 XL
1279:1 September
1198:1 September
1056:1 September
845: Earth
798:Relative to
572:Earth orbit
467:around the
345:Earth
312:Inclination
301:Mean motion
96:polar orbit
2088:Categories
1998:Meteoroids
1977:Sungrazing
1952:Hyperbolic
1908:Oort cloud
1851:Near-Earth
1408:21 January
1386:21 January
1034:References
996:= 42.1219
908:represent
824:Around Sun
503:, and the
485:barycenter
375:123 m
258:1.00
220:Perihelion
81:spacecraft
61:spacecraft
2030:Astronomy
1888:Damocloid
1646:Ephemeris
1638:Discovery
1314:(2): 29.
1219:Space.com
1170:205225571
834: Sun
761:libration
673:eccentric
559:Discovery
68:Discovery
50:Asteroid
1972:Periodic
1898:Detached
1818:Asteroid
1474:Archived
1427:BBC News
1349:NBC News
1162:21796207
1089:31 March
950:See also
692:inclined
589:and the
555:(WISE).
272:Average
202:Aphelion
18:2010 TK7
2016:Portals
1937:Extinct
1876:Centaur
1616:at the
1607:Summary
1466:2010 TK
1450:2010 TK
1432:29 July
1360:28 July
1316:Bibcode
1250:31 July
1224:27 July
1142:Bibcode
1022:2010 TK
998:√
957:2020 XL
918:2010 TK
880:2010 TK
858:2010 TK
779:2010 TK
763:about L
745:chaotic
738:2010 TK
729:2010 TK
718:2010 TK
711:2010 TK
681:2010 TK
667:with a
655:⁄
645:2010 TK
635:has an
630:2010 TK
620:2010 TK
576:2010 TK
518:2010 TK
501:Neptune
497:Jupiter
463:in its
445:2010 TK
340:45.927°
328:96.498°
316:20.890°
246:0.19059
123:2010 TK
52:2010 TK
1929:Comets
1841:Family
1826:Active
1793:Groups
1666:·
1664:
1658:·
1656:
1650:·
1648:
1642:·
1640:
1634:·
1632:
1603:·
1601:
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1534:
1528:·
1526:
1520:·
1518:
1512:·
1510:
1504:·
1502:
1496:·
1494:
1471:motion
1168:
1160:
1133:Nature
1006:0.9989
1004:− 0.5/
1002:0.9989
856:
854:
849:·
847:
843:
838:·
836:
832:
669:period
657:20,000
641:albedo
596:Nature
508:Tethys
291:354.14
156:(2013)
154:Apollo
150:(2014)
2042:Stars
1986:Other
1942:Great
1668:
1660:
1652:
1644:
1636:
1605:
1597:
1591:Orbit
1589:
1581:
1554:
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1498:
1166:S2CID
981:Notes
912:paths
904:and L
851:
840:
755:via L
583:Earth
535:Earth
512:Dione
465:orbit
461:Earth
393:0.049
389:0.059
172:Epoch
1962:Lost
1803:Moon
1798:List
1567:ESA–
1516:MOID
1434:2011
1410:2012
1388:2012
1382:=2))
1362:2011
1281:2015
1252:2011
1226:2011
1200:2015
1188:NASA
1158:PMID
1091:2016
1058:2015
725:Moon
566:, a
564:WISE
549:NASA
510:and
493:Mars
421:20.8
347:MOID
148:Aten
79:WISE
59:WISE
1565:at
1485:at
1324:doi
1150:doi
1138:475
665:Sun
551:'s
469:Sun
415:(H)
371:379
92:LEO
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499:,
495:,
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260:yr
212:Gm
208:AU
176:JD
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