1531:
217:
937:
653:, a new subclass of near-Earth asteroids, which have their orbits entirely within that of Earth and are therefore alternatively called Interior-Earth Objects (IEO). As of 2019, there are only 36 known members of the Atira group of asteroids. Atiras are similar to the larger group of
764:
is one of the largest Near-Earth objects. Early estimates of its size ranged from 1 to 2 kilometers, but those were based on an assumed higher albedo of 0.20. Its larger size and low albedo were discovered when
724: – as Venus orbits the Sun at a distance of 0.72–0.73 AU – but does not get as close to the Sun as Mercury (which orbits between 0.31 and 0.47 AU). As no
833:
Because the first known object in a new class of asteroids will become the name of the new class, due consideration was given to the name for (163693). The other classes of near-Earth asteroids,
789:
Atira came within 0.207 AU (31,000,000 km) from Earth in
January 2017, the closest since its discovery in 2003. This provided an opportunity to study the asteroid by
1660:
825:. Additional images taken on 23 January 2017 showed that the two components are orbiting each other at a distance of about 6 km with an orbital period of 15.5 hours.
1605:
1270:
1955:
1925:
841:, and Atens, are named after a Roman, Greek, and Egyptian god respectively, each of which begins with the letter 'A'. Atira follows this pattern, being named after
643:
444:
1626:
857:. Atiraʼ is the wife of the creator god, Tirawa, and goddess of Earth and the evening star. The official naming citation was published by the
1653:
782:
29:
1598:
639:
599:
164:
56:
678:
430:
1646:
851:
1777:
1591:
1412:
877:
51:
1950:
1124:
Deleon, Aaron P.; Becker, Tracy M.; Marshall, Sean E.; Pravec, Petr; Hornoch, Kamil; Kučáková, Hana; et al. (March 2023).
360:
1935:
1709:
289:
1868:
1940:
1552:
1694:
1317:
1099:
999:
68:
1858:
1848:
1177:
682:
504:
489:
436:
1945:
1853:
967:
63:
1930:
1689:
1399:
89:
1873:
1757:
1669:
1525:
533:
470:
452:
278:
265:
257:
1365:
908:
1794:
1057:
Rivera-Valentin, E. G.; Taylor, P. A.; Virkki, A.; Aponte-Hernandez, B. (January 2017). "(163693) Atira".
863:
1699:
1614:
744:
372:
243:
1489:
1457:
1449:
1127:
Characterization of
Asteroid (163693) Atira with Arecibo Radar and Multi-Epoch Photometric Observations
817:
is possibly elongated and very angular in shape. The secondary is tidally locked and has a diameter of
1767:
1513:
1505:
1497:
1481:
1473:
1465:
1440:
1289:
1261:
1234:
1152:
1066:
705:
300:
1434:
858:
794:
754:
709:
673:(< 0.983 AU), which means that they do not approach Earth as close as Atens do in general.
349:
33:
630:. The primary component with a diameter of approximately 4.8 kilometers (3 miles) is orbited by a
1279:
550:
1560:
1027:
1752:
1704:
806:
749:
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662:
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384:
271:
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37:
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224:
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105:
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1125:
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1814:
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713:
409:
330:
311:
210:
195:
1409:
781:
28:
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854:
834:
721:
654:
200:
1904:
1677:
1204:
323:
181:
1225:
Shoemaker, E. M. (December 1982). "Asteroid and comet bombardment of the earth".
1133:. 54th Lunar and Planetary Science Conference 2023. Lunar and Planetary Institute
963:
1894:
1843:
1804:
725:
338:
1863:
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670:
627:
235:
1899:
1789:
1638:
1302:
403:
1583:
1321:
1719:
1393:
1343:
1181:
846:
769:
was imaged by radar in early 2017. These radar images also revealed that
717:
666:
611:
393:
133:
1260:
de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (1 August 2019).
1266:, a major step towards the future discovery of the Vatira population"
1028:"Asteroids with Satellites Database – (163693) Atira"
1284:
614:, dwelling in the interior of Earth's orbit. It is classified as a
1830:
780:
720:. With a perihelion of 0.50 AU the body also classifies as a
415:
1642:
1587:
587:
117:
809:, S/2017 (163693) 1, in orbit. The primary with a diameter of
681:
of 0.2059 AU (30,800,000 km) or approximately 80.1
1262:"Understanding the evolution of Atira-class asteroid 2019 AQ
638:
was discovered on 11 February 2003, by astronomers with the
1437: – Numbered Minor Planets (160001)–(165000)
1155:. NEODyS: Near Earth Objects – Dynamic Site
964:"JPL Small-Body Database Browser: 163693 Atira (2003 CP20)"
590:
578:
120:
108:
1178:"Lincoln Laboratory discovers inner Earth orbit asteroids"
700:
asteroid and orbits the Sun at a distance of 0.5–1.0
1000:"Discovery Announcement of Binary System (163693) Atira"
739:
begins with its discovery observation in 2003. It has a
1153:"(163693) Atira – PHYSICAL INFORMATION"
940:, AISRI Dictionary Database Search, Indiana University.
1052:
1050:
1048:
649:
It is the namesake and the first numbered body of the
743:
of 3.3984 hours with a brightness variation of 0.36
584:
114:
1887:
1829:
1766:
1718:
1676:
785:
Arecibo follow-up observations from 23 January 2017
581:
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140:
111:
99:
87:
82:
74:
62:
50:
45:
1021:
1019:
1017:
626:, a system of two asteroids orbiting their common
1271:Monthly Notices of the Royal Astronomical Society
994:
992:
990:
988:
986:
984:
704:once every 8 months (233 days). Its orbit has an
657:, as both are near-Earth objects and both have a
665:). However, and contrary to Aten asteroids, the
646:near Socorro, New Mexico, in the United States.
1654:
1599:
1227:Annual Review of Earth and Planetary Sciences
634:that measures about 1 km (0.6 mi).
8:
1205:"Names of Solar System objects and features"
1119:
1117:
903:
901:
899:
897:
895:
893:
21:
1320:. Jet Propulsion Laboratory. Archived from
644:Lincoln Laboratory's Experimental Test Site
1682:
1661:
1647:
1639:
1606:
1592:
1584:
1529:
1180:. Lincoln Observatory, MIT. Archived from
1172:
1170:
669:for Atiras is always smaller than Earth's
661:smaller than that of Earth (< 1.0
27:
1445:NeoDyS-2, Near Earth Objects—Dynamic Site
1301:
1283:
1026:Johnston, Wm. Robert (19 February 2017).
958:
956:
954:
952:
950:
948:
946:
850:, an epithet of the Earth goddess of the
1402:, European Asteroid Research Node (EARN)
1956:Astronomical objects discovered in 2003
1926:Minor planet object articles (numbered)
1431:, Robert Johnston, johnstonsarchive.net
889:
1203:Wm. Robert Johnston (24 August 2006).
1094:
1092:
1090:
1088:
1086:
1084:
1082:
1080:
936:, University of Nebraska Press, 2008.
845:
132:
20:
1102:. Asteroid Lightcurve Database (LCDB)
361:Longitude of ascending node
7:
640:Lincoln Near-Earth Asteroid Research
1534:
1406:Asteroid Lightcurve Database (LCDB)
1247:10.1146/annurev.ea.11.050183.002333
1059:Central Bureau Electronic Telegrams
760:With a diameter of 4.8 kilometers,
679:minimum orbit intersection distance
14:
797:on 20 January 2017 revealed that
1423:Dictionary of Minor Planet Names
932:Douglas Parks & Lula Pratt,
574:
215:
104:
1344:"Ancient Gods & Goddesses"
1100:"LCDB Data for (163693) Atira"
1:
157:epithet of the earth goddess)
934:A Dictionary of Skiri Pawnee
36:discovery image of orbiting
435:0.2076 AU (80.88
373:Argument of perihelion
1972:
1400:Facts Sheet (163693) Atira
909:"163693 Atira (2003 CP20)"
182:Minor planet category
1685:
1670:Small Solar System bodies
1621:
1429:Asteroids with Satellites
968:Jet Propulsion Laboratory
563:
312:Orbital period (sidereal)
242:
230:
26:
1415:16 December 2017 at the
966:(2017-04-30 last obs.).
551:Absolute magnitude
445:Physical characteristics
165:Alternative designations
40:taken on 20 January 2017
1615:Minor planets navigator
1526:JPL Small-Body Database
1435:Discovery Circumstances
600:provisional designation
471:Synodic rotation period
225:Orbital characteristics
1951:Radar-imaged asteroids
1795:Trans-Neptunian object
1458:Observation prediction
786:
773:is a binary asteroid.
1936:Discoveries by LINEAR
1366:"MPC/MPO/MPS Archive"
1303:10.1093/mnras/stz1437
1002:. Arecibo Observatory
784:
244:Uncertainty parameter
1768:Distant minor planet
878:594913 ꞌAylóꞌchaxnim
861:on 22 January 2008 (
716:with respect to the
90:MPC designation
1941:Named minor planets
1577:Physical parameters
1370:Minor Planet Center
1346:. www.godfinder.org
1294:2019MNRAS.487.2742D
1239:1983AREPS..11..461S
1071:2017CBET.4347....1R
913:Minor Planet Center
859:Minor Planet Center
795:Arecibo Observatory
689:Physical properties
75:Discovery date
64:Discovery site
23:
1490:Observational info
1324:on 2 February 2002
1184:on 10 October 2015
1032:Johnston's Archive
793:. Images taken at
787:
505:ecliptic longitude
52:Discovered by
1913:
1912:
1825:
1824:
1710:Meanings of names
1636:
1635:
807:minor-planet moon
801:is a synchronous
753:) and a very low
632:minor-planet moon
616:near-Earth object
567:
566:
490:ecliptic latitude
421:Type: synchronous
344:1° 32 41.64 / day
1963:
1946:Binary asteroids
1683:
1663:
1656:
1649:
1640:
1608:
1601:
1594:
1585:
1569:Orbital elements
1533:
1498:Close approaches
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1278:(2): 2742–2752.
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847:[ətíɾəʔ]
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734:
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519:Geometric albedo
512:
497:
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418:
406:
401:
238: 2458200.5)
219:
175:
158:
151:"my/our mother"
136:
134:[ətíɾəʔ]
131:
127:
126:
123:
122:
119:
116:
113:
110:
78:11 February 2003
31:
24:
1971:
1970:
1966:
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1961:
1960:
1931:Atira asteroids
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1915:
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1883:
1821:
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1514:Orbit animation
1482:Proper elements
1417:Wayback Machine
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917:
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906:
891:
886:
874:
862:
852:Native American
831:
820:
818:
812:
810:
803:binary asteroid
779:
748:
741:rotation period
737:observation arc
732:
708:of 0.32 and an
691:
683:lunar distances
659:semi-major axis
651:Atira asteroids
624:binary asteroid
607:
603:
577:
573:
556:
542:
536:
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290:Semi-major axis
252:Observation arc
234:23 March 2018 (
205:
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69:Lincoln Lab ETS
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1908:
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1884:
1882:
1881:
1876:
1871:
1869:Near-parabolic
1866:
1861:
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1846:
1841:
1835:
1833:
1827:
1826:
1823:
1822:
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1819:
1818:
1817:
1815:Scattered disc
1812:
1807:
1802:
1792:
1787:
1786:
1785:
1783:Neptune trojan
1780:
1772:
1770:
1764:
1763:
1761:
1760:
1758:Spectral types
1755:
1750:
1748:Jupiter trojan
1745:
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1537:Close approach
1518:
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1432:
1426:
1425:, Google books
1420:
1408:, query form (
1403:
1397:
1389:
1388:External links
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687:
655:Aten asteroids
605:
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295:0.7411 AU
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283:0.5024 AU
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260:(5,192 d)
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1738:Asteroid belt
1736:
1734:
1733:Aten asteroid
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1678:Minor planets
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1561:Orbit diagram
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1506:Physical info
1503:
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855:Pawnee people
853:
848:
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840:
836:
828:
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796:
792:
783:
777:Binary system
776:
774:
772:
768:
763:
758:
756:
751:
746:
742:
738:
731:
727:
723:
722:Venus-crosser
719:
715:
711:
707:
703:
699:
695:
688:
686:
684:
680:
677:has an Earth
676:
672:
668:
664:
660:
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652:
647:
645:
641:
637:
633:
629:
625:
621:
617:
613:
610:) is a stony
609:
601:
595:
571:
562:
558:
555:
554:
547:
541:
538:
535:
534:Spectral type
530:
523:
520:
515:
509:
506:
500:
494:
491:
485:
481:0.0006 h
475:
472:
467:
457:
454:
453:Mean diameter
449:
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438:
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427:
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201:Venus-crosser
199:
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100:Pronunciation
98:
94:
91:
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81:
77:
73:
70:
67:
65:
61:
58:
55:
53:
49:
44:
39:
35:
30:
25:
19:
1905:Space debris
1627:163693 Atira
1625:
1572:
1564:
1556:
1548:
1540:
1524:
1521:163693 Atira
1509:
1501:
1493:
1485:
1477:
1469:
1466:Orbital info
1461:
1453:
1444:
1441:163693 Atira
1373:. Retrieved
1369:
1360:
1348:. Retrieved
1338:
1326:. Retrieved
1322:the original
1318:"NEO Groups"
1312:
1275:
1269:
1255:
1230:
1226:
1220:
1208:. Retrieved
1198:
1186:. Retrieved
1182:the original
1157:. Retrieved
1147:
1135:. Retrieved
1126:
1104:. Retrieved
1062:
1058:
1035:. Retrieved
1031:
1004:. Retrieved
971:. Retrieved
933:
928:
916:. Retrieved
912:
843:Atiraʼ
832:
798:
788:
770:
766:
761:
759:
729:
728:were found,
706:eccentricity
693:
692:
674:
648:
635:
619:
602:
570:163693 Atira
569:
568:
552:
324:Mean anomaly
301:Eccentricity
270:0.9798
148:Atíraʼ
147:
83:Designations
22:163693 Atira
18:
1895:Cosmic dust
1859:Long-period
1849:Halley-type
1805:Kuiper belt
1690:Designation
1450:Ephemerides
1396:at klet.org
1233:: 461–494.
1210:11 November
823:0.3 km
815:0.5 km
757:of 0.0231.
726:precoveries
710:inclination
463:0.5 km
429:Earth
350:Inclination
339:Mean motion
256:14.21
142:Named after
1920:Categories
1900:Meteoroids
1879:Sungrazing
1854:Hyperbolic
1810:Oort cloud
1753:Near-Earth
1328:9 December
1285:1905.08695
1137:4 February
884:References
671:perihelion
628:barycenter
414:15.5
385:satellites
279:Perihelion
1790:Damocloid
1553:Ephemeris
1545:Discovery
745:magnitude
543:(assumed)
526:(derived)
402:0.3
46:Discovery
38:satellite
1874:Periodic
1800:Detached
1720:Asteroid
1413:Archived
1375:21 April
1037:21 April
973:21 April
918:21 April
872:See also
718:ecliptic
667:aphelion
612:asteroid
317:233 days
266:Aphelion
16:Asteroid
1839:Extinct
1778:Centaur
1523:at the
1290:Bibcode
1235:Bibcode
1067:Bibcode
839:Apollos
805:with a
604:2003 CP
524:0.0231
378:252.93°
366:103.90°
354:25.618°
171:2003 CP
130:Pawnee:
34:Arecibo
1831:Comets
1743:Family
1728:Active
1695:Groups
1573:·
1571:
1565:·
1563:
1557:·
1555:
1549:·
1547:
1541:·
1539:
1510:·
1508:
1502:·
1500:
1494:·
1492:
1486:·
1484:
1478:·
1476:
1470:·
1468:
1462:·
1460:
1454:·
1452:
1350:29 May
1188:29 May
1159:29 May
1106:29 May
1006:29 May
864:M.P.C.
755:albedo
698:S-type
477:3.3984
383:Known
329:30.769
305:0.3221
211:Symbol
155:Pawnee
57:LINEAR
1888:Other
1844:Great
1575:
1567:
1559:
1551:
1543:
1512:
1504:
1496:
1488:
1480:
1472:
1464:
1456:
1394:Photo
1280:arXiv
1131:(PDF)
1065:: 1.
938:atira
866:61768
835:Amors
799:Atira
791:radar
771:Atira
767:Atira
762:Atira
733:'
730:Atira
712:of 26
696:is a
694:Atira
675:Atira
636:Atira
622:is a
620:Atira
503:Pole
488:Pole
232:Epoch
196:Atira
1864:Lost
1705:Moon
1700:List
1474:MOID
1410:info
1377:2018
1352:2017
1330:2015
1212:2016
1190:2017
1161:2017
1139:2023
1108:2017
1063:4347
1039:2018
1008:2017
975:2018
920:2018
829:Name
559:16.3
511:192°
496:−50°
431:MOID
1443:at
1298:doi
1276:487
1243:doi
868:).
819:1.0
811:4.8
750:U=2
642:at
553:(H)
459:4.8
398:1.0
191:NEO
1922::
1368:.
1296:.
1288:.
1274:.
1268:.
1241:.
1231:11
1229:.
1169:^
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1079:^
1061:.
1047:^
1030:.
1016:^
983:^
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911:.
892:^
837:,
735:s
702:AU
685:.
663:AU
618:.
606:20
598:;
588:ɪr
437:LD
412::
404:km
396::
272:AU
258:yr
236:JD
173:20
118:ɪr
1662:e
1655:t
1648:v
1607:e
1600:t
1593:v
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1379:.
1354:.
1332:.
1306:.
1300::
1292::
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1245::
1237::
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1192:.
1163:.
1141:.
1110:.
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1069::
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714:°
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591:ə
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540:S
479:±
461:±
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416:h
410:P
400:±
394:D
389:1
331:°
246:0
153:(
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121:ə
115:t
112:ˈ
109:ə
106:/
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