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roughly 53 meters (170 feet) in diameter. It was discovered on 13 December 2018 when the asteroid was about 0.125 AU (18,700,000 km; 11,600,000 mi) from Earth and had a
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rating at –3.6. In mid-2019 it was recovered which extended the observation arc to 177 days and was removed from the
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534:
387:. It passed closest approach to Earth on 1 January 2019. Of the asteroids discovered in 2018, it had the highest
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listed the nominal 22 June 2092 Earth distance as 0.009 AU (1,300,000 km; 840,000 mi).
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showed an estimated 1 in 6200 chance of the asteroid impacting Earth on 22 June 2092. The nominal
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using Solex 12 with 1000 clones of the asteroid showed that by 2092 the uncertainty region for
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22 June 2092 Earth distance was 0.17 AU (25,000,000 km; 16,000,000 mi) with a
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on 12 June 2019. It is now known that on 22 June 2092 the asteroid will pass about
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566:. NASA/JPL Near-Earth Object Program Office. Archived from
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Near-Earth objects removed from the Sentry Risk Table
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527:"JPL Small-Body Database Browser: (2018 XB4)"
8:
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463:. IAU Minor Planet Center. 15 December 2018
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1546:
1538:
871:(lunar obiter, lander and rover; Jul 2019)
797:
783:
775:
425:uncertainty of ±320 million kilometers. A
33:Orbit of 2018 XB4 with 15-day motion shown
27:
1830:Minor planet object articles (unnumbered)
639:NeoDyS-2, Near Earth Objects—Dynamic Site
521:
519:
517:
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558:
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1850:Astronomical objects discovered in 2018
452:
602:"2018XB4 Ephemerides for 22 June 2092"
15:
1476:(end of mission; Aug 2018 / Feb 2019)
612:from the original on 20 February 2019
608:(Near Earth Objects – Dynamic Site).
564:"Earth Impact Risk Summary: 2018 XB4"
541:from the original on 20 February 2019
268:Longitude of ascending node
7:
1311:(first-ever light from bh-bh merger)
857:(solar sail demonstration; Jun 2019)
723:
436:stretched around the entire orbit.
14:
1317:(first-ever "mass-gap" collision)
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529:(last observation: 2019-01-24;
1:
1527:Category:2020 in outer space
1522:Category:2019 in outer space
1517:Category:2018 in outer space
280:Argument of perihelion
1866:
1845:Near-Earth objects in 2019
461:"MPEC 2018-X119: 2018 XB4"
104:Minor planet category
1835:Discoveries by Pan-STARRS
1584:
1569:Small Solar System bodies
1495:
934:Asteroid close approaches
876:
810:
535:Jet Propulsion Laboratory
354:
213:Orbital period (sidereal)
143:
131:
26:
851:(lunar lander; Feb 2019)
342:Absolute magnitude
317:Physical characteristics
720:JPL Small-Body Database
125:Orbital characteristics
1694:Trans-Neptunian object
1507:Outer space portal
1450:; Dec 2018 / Jan 2019)
652:Observation prediction
427:Monte Carlo simulation
145:Uncertainty parameter
74:(first observed only)
1667:Distant minor planet
1466:far side of the Moon
87:MPC designation
1416:138P/Shoemaker–Levy
1396:C/2018 Y1 (Iwamoto)
1321:J043947.08+163415.7
766:Physical parameters
570:on 18 February 2019
495:Minor Planet Center
377:near-Earth asteroid
68:Discovery date
57:Discovery site
23:
1188:Proxima Centauri c
684:Observational info
45:Discovered by
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1811:
1724:
1723:
1609:Meanings of names
1535:
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1435:Space exploration
1406:168P/Hergenrother
415:Sentry Risk Table
393:Sentry Risk Table
358:
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1825:Apollo asteroids
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1484:(departure from
1464:(landing on the
1446:(encounter with
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1212:Teegarden's Star
1208:i (hypothesized)
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692:Close approaches
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381:solar elongation
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251:0° 53 20.4 / day
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71:13 December 2018
39:Discovery
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1067:Beta Pictoris c
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985:1620 Geographos
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157:Observation arc
135:27 April 2019 (
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1299:EPIC 204376071
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726:Close approach
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629:External links
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591:(Peter Thomas)
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409:With a 42-day
368:(also written
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62:Haleakala Obs.
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1577:Minor planets
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1375:WD J0914+1914
1373:
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1367:detection of
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1170:Luyten's Star
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901:Impact events
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861:Chandrayaan-2
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805:2019 in space
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750:Orbit diagram
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700:Physical info
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389:Palermo scale
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325:Mean diameter
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1804:Space debris
1520:
1486:162173 Ryugu
1479:
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1459:
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1443:New Horizons
1441:
1084:Gliese 357 d
975:66391 Moshup
939:
772:
761:
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745:
737:
729:
718:
703:
695:
687:
679:
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663:
660:Orbital info
655:
647:
638:
614:. Retrieved
596:
589:Solex clones
584:
572:. Retrieved
568:the original
543:. Retrieved
533:: 42 days).
498:. Retrieved
494:
465:. Retrieved
455:
442:
419:JPL Horizons
408:
406:from Earth.
360:
359:
343:
229:Mean anomaly
202:Eccentricity
148:
113:
80:Designations
1794:Cosmic dust
1758:Long-period
1748:Halley-type
1704:Kuiper belt
1589:Designation
1488:; Dec 2019)
1473:Opportunity
1468:; Jan 2019)
1401:78P/Gehrels
1369:exoasteroid
1365:WD 0145+234
1328:water vapor
1294:GRB 190114C
1284:ASASSN-19bt
1265:Discoveries
1229:V1298 Tauri
1193:Struve 2398
911:(announced)
855:LightSail 2
834:Space probe
644:Ephemerides
616:20 February
574:20 February
545:19 February
500:26 February
467:19 February
401:0.015
290:Earth
257:Inclination
246:Mean motion
1819:Categories
1799:Meteoroids
1778:Sungrazing
1753:Hyperbolic
1709:Oort cloud
1652:Near-Earth
1421:171P/Spahr
1371:disruption
1354:2I/Borisov
1131:Kepler-47d
1120:Gliese 784
1114:Gliese 754
1108:Gliese 555
1102:Gliese 687
1089:Gliese 588
1078:Gliese 251
1072:DS Tucanae
1048:Exoplanets
491:"2018 XB4"
447:References
180:Perihelion
139:2458600.5)
50:Pan-STARRS
1689:Damocloid
1481:Hayabusa2
1455:Chang'e 4
1411:163P/NEAT
1309:GW190521g
1289:AT2019qiz
1158:LP 816-60
1142:L 1159-16
1133:confirmed
1126:HR 5183 b
1061:AD Leonis
924:Selected
849:Beresheet
742:Ephemeris
734:Discovery
473:(K18X04B)
196:1.0712 AU
184:0.8577 AU
1773:Periodic
1699:Detached
1619:Asteroid
1358:20
1315:GW190814
1304:GW190412
1248:Wolf 359
1206:Tau Ceti
1164:LTT 1445
1137:K2-288Bb
836:launches
715:2018 XB4
635:2018 XB4
610:Archived
539:Archived
372:) is an
370:2018 XB4
331:53
167:Aphelion
1738:Extinct
1677:Centaur
1384:Comets
1349:S5-HVS1
1273:2019 AQ
1183:PDS 70c
1032:2019 UN
1020:2019 TA
1008:2019 SU
991:2006 QV
980:2019 OK
964:2016 AZ
952:2019 AS
940:2018 XB
915:2019 MO
869:Pragyan
824: »
815:«
717:at the
431:2018 XB
423:3-sigma
362:2018 XB
311:3.68 AU
285:92.282°
273:92.063°
261:8.7263°
222:(405 d)
171:1.2848
161:42 days
127:
93:2018 XB
18:2018 XB
1730:Comets
1642:Family
1627:Active
1594:Groups
1461:Yutu-2
1340:mapped
1334:imaged
1326:K2-18b
865:Vikram
762:·
760:
754:·
752:
746:·
744:
738:·
736:
730:·
728:
704:·
702:
696:·
694:
688:·
686:
680:·
678:
672:·
670:
664:·
662:
656:·
654:
648:·
646:
606:NEODyS
438:NEODyS
413:, the
383:of 146
374:Apollo
235:35.965
206:0.1993
149:·
114:·
110:Apollo
1787:Other
1743:Great
764:
756:
748:
740:
732:
706:
698:
690:
682:
674:
666:
658:
650:
397:0.033
218:1.11
133:Epoch
116:
1763:Lost
1604:Moon
1599:List
1332:M87*
926:NEOs
822:2020
817:2018
668:MOID
618:2019
576:2019
547:2019
502:2019
469:2019
350:24.0
307:MOID
292:MOID
637:at
531:arc
344:(H)
118:NEO
1821::
1525:—
1519:—
1458:/
1200:Bc
1197:Bb
1166:Ab
1035:13
994:89
867:/
863:/
604:.
555:^
537:.
510:^
493:.
478:^
403:AU
298:LD
220:yr
173:AU
137:JD
1561:e
1554:t
1547:v
1276:3
1255:c
1252:b
1242:e
1239:d
1236:c
1233:b
1222:c
1217:b
1177:e
1174:d
1160:b
1152:d
1149:c
1146:b
1122:b
1116:b
1110:b
1104:c
1096:c
1093:b
1080:c
1074:b
1063:b
1023:7
1011:3
967:8
955:5
943:4
798:e
791:t
784:v
620:.
578:.
549:.
504:.
471:.
433:4
399:±
385:°
364:4
333:m
300:)
237:°
95:4
20:4
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