1130:
1136:
1142:
1414:
1048:
1639:
1798:
317:
24:
1787:
344:
with an eccentricity below 1. The velocity of the object currently has an uncertainty of ±0.2 km/s. With a common Oort cloud velocity of roughly 3 km/s (6,700 mph) when inbound 200 AU from the Sun, there is no reason to think 2018 F4 is of interstellar origin.
780:
Licandro, Javier; de la Fuente Marcos, Carlos; de la Fuente Marcos, RaĂșl; de Leon, Julia; Serra-Ricart, Miquel; Cabrera-Lavers, Antonio (28 May 2019). "Spectroscopic and dynamical properties of comet C/2018 F4, likely a true average former member of the Oort cloud".
607:
with a confident 34-day observation arc. Comet C/2008 J4 (McNaught) has a short observation arc with large uncertainties. Comet C/1999 U2 (SOHO) has a meaningless 1-day observation arc. Comet C/2018 F4 has a common Oort cloud velocity when 200 AU from the Sun.
304:(closest approach to the Sun) is inside the orbit of Jupiter, this object should become more active. In April 2018 it was determined to be a hyperbolic comet. Given that the incoming velocity was similar to that of an
911:
using Soln.date: 2018-Apr-29. Observer
Location: "@sun"/ Table settings: "20. Observer range & range-rate", "39. Range & range-rate 3-sigmas". Columns: deldot, RNGRT_3sig
1182:
1837:
214:
1004:
1413:
1047:
351:
Further observations will be necessary to determine if the orbit is hyperbolic. As a comet this object became known as C/2018 F4 (PANSTARRS).
1687:
1409:
1056:
908:
834:
de la Fuente Marcos, Carlos; de la Fuente Marcos, RaĂșl; Licandro, Javier; Serra-Ricart, Miquel; Cabrera-Lavers, Antonio (2 October 2019).
196:
1842:
39:
702:
366:
a hundred thousand years. The heliocentric eccentricity became greater than 1 in
November 2016 when the comet was 9.6
1129:
1811:
1806:
1801:
1554:
951:
1549:
997:
894:
308:
object, we can very confidently say that it is not of interstellar origin. C/2018 F4 fragmented around August 2020.
1832:
728:
698:
269:
51:
1541:
1530:
603:
At 200 AU from the Sun, the escape velocity from the Sun is 2.98 km/s. In the above table, the only outlier is
77:
1638:
1063:
929:
753:
661:
296:. It was quite far from the Sun and turned out to simply be an asteroidal object that was discovered before
221:
133:
1677:
1135:
1720:
1029:
1024:
990:
1672:
836:"Ordinary Oort Cloud Comets: An Update on the Past and Future Orbital Evolution of C/2018 F4 (PANSTARRS)"
56:
847:
800:
630:
329:
325:
152:
1481:
1393:
1280:
1268:
1041:
371:
277:
178:
1791:
1657:
1647:
1091:
865:
816:
790:
474:
432:
363:
240:
959:
1737:
1174:
367:
359:
285:
202:
145:
111:
1536:
1520:
1489:
1163:
1141:
1104:
855:
808:
804:
496:
103:
95:
943:
935:
1770:
975:
403:
355:
320:
Path of comet across sky, with 30-day markers, visible over the south pole near perihelion
297:
123:
924:
851:
1431:
348:
It will come to perihelion around 3 December 2019 when it will be 3.4 AU from the Sun.
341:
967:
1826:
1080:
869:
749:
724:
657:
820:
1765:
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1714:
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1619:
1150:
358:
of 35 days suggests that before entering the planetary region of the Solar System (
89:
1110:
812:
604:
580:
1667:
1625:
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1422:
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410:
316:
860:
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882:
305:
115:
44:
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1200:
375:
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206:
23:
1504:
1499:
1476:
1381:
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1321:
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1224:
1212:
1188:
328:
to the C/2018 F4 data, as used to be done for most short arc comets. The
1730:
1456:
1451:
1446:
1441:
1436:
1428:
1303:
1262:
1257:
1240:
1235:
1158:
1075:
281:
28:
Comet's trajectory through the Solar System, with 30-day motion markers
280:). It was discovered on 17 March 2018 when it was beyond the orbit of
1471:
1466:
1461:
1114:
795:
315:
301:
1605:
1118:
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1068:
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986:
902:
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Research Notes of the
American Astronomical Society
775:
773:
771:
238:
220:
213:
194:
177:
151:
132:
122:
102:
87:
75:
70:
62:
50:
38:
33:
750:"MPEC 2018-H21 : COMET C/2018 F4 (PANSTARRS)"
625:
623:
621:
883:Re: fragmentation of comet C/2018 F4 (PANSTARRS)
652:
650:
695:"JPL Small-Body Database Browser: (A/2018 F4)"
998:
8:
382:Inbound velocity at 200 AU from the Sun
16:
1005:
991:
983:
380:
22:
859:
794:
689:
687:
685:
683:
681:
679:
1838:Astronomical objects discovered in 2018
646:
617:
362:1950), the comet had an orbital period
633:as low as 0.996. (Math: 1.0039-0.0072)
15:
1761:(enters interstellar space; Dec 2018)
1688:C/2018 V1 (Machholz-Fujikawa-Iwamoto)
909:JPL Horizons On-Line Ephemeris System
7:
933:
705:from the original on 28 March 2018
14:
1797:
1796:
1785:
1637:
1412:
1140:
1134:
1128:
1046:
324:It would be no problem to fit a
1095:(solar space mission; Aug 2018)
384:compared to Oort cloud objects
1:
1550:Hyperion proto-supercluster
899:Solar System Dynamics Group
813:10.1051/0004-6361/201834902
658:"MPEC 2018-F139: A/2018 F4"
332:is decently constrained at
1859:
783:Astronomy and Astrophysics
272:(previously classified as
90:Minor planet category
1843:Discoveries by Pan-STARRS
1780:
1183:Asteroid close approaches
1126:
1018:
729:Jet Propulsion Laboratory
725:"Asteroid Size Estimator"
699:Jet Propulsion Laboratory
259:
110:
21:
1734:(Mars landing; Oct 2018)
1531:MACS J1149 Lensed Star 1
895:"HORIZONS Web-Interface"
861:10.3847/2515-5172/ab4888
697:(2018-04-13 last obs.).
629:C/2018 F4 could have an
340:, so it could even be a
241:Absolute magnitude
215:Physical characteristics
1555:2MASS J18082002â5104378
1059:(lunar flyby; Apr 2018)
930:JPL Small-Body Database
805:2019A&A...625A.133L
754:IAU Minor Planet Center
662:IAU Minor Planet Center
288:(960 million
104:Orbital characteristics
1792:Outer space portal
1773:; Dec 2018 / Jan 2019)
907:Results produced with
581:1I/2017 U1 (ʻOumuamua)
454:C/1997 P2 (Spacewatch)
321:
205:(90 million
1683:C/2018 F4 (PanSTARRS)
319:
266:C/2018 F4 (PanSTARRS)
57:Haleakala Observatory
17:C/2018 F4 (PanSTARRS)
631:orbital eccentricity
518:C/2008 J4 (McNaught)
330:orbital eccentricity
78:MPC designation
1812:2019 in outer space
1807:2018 in outer space
1802:2017 in outer space
1542:541132 LeleÄkĆ«honua
976:Physical parameters
852:2019RNAAS...3..143D
385:
354:The somewhat short
300:was noticeable. As
278:hyperbolic asteroid
63:Discovery date
52:Discovery site
18:
1753:arrival; Dec 2018)
1717:arrival; Jun 2018)
1678:38P/StephanâOterma
1658:C/2018 C2 (Lemmon)
1648:C/2017 T1 (Heinze)
1092:Parker Solar Probe
789:: A133 (6 pages).
513:6,514 in 784 days
491:2,222 in 235 days
475:C/2010 X1 (Elenin)
433:C/1980 E1 (Bowell)
381:
322:
40:Discovered by
1833:Hyperbolic comets
1820:
1819:
1702:Space exploration
1673:64P/SwiftâGehrels
1485:(refuted in 2021)
601:
600:
449:179 in 2514 days
427:196 in 9240 days
400:# of observations
298:cometary activity
263:
262:
1850:
1800:
1799:
1790:
1789:
1788:
1769:(encounter with
1641:
1586:
1583:
1581:
1580:
1569:
1567:
1566:
1546:
1537:moons of Jupiter
1490:EPIC 211945201 b
1486:
1482:Barnard's Star b
1416:
1401:
1399:
1398:
1394:(163899) 2003 SD
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1281:(505657) 2014 SR
1276:
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1269:(276033) 2002 AJ
1254:
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1164:Kamchatka meteor
1144:
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1117:(mission to the
1067:(mission to the
1050:
1007:
1000:
993:
984:
968:Orbital elements
912:
906:
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674:
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634:
627:
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572:
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560:C/1999 U2 (SOHO)
555:402 in 967 days
552:
550:
530:
528:
510:
508:
497:C/2012 S1 (ISON)
488:
486:
466:
464:
446:
444:
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422:
386:
378:) from the Sun.
339:
337:
270:hyperbolic comet
255:
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172:
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161:
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96:hyperbolic comet
34:Discovery
26:
19:
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1771:486958 Arrokoth
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1521:LSPM J0207+3331
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597:121 in 34 days
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364:on the order of
356:observation arc
335:
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326:parabolic orbit
314:
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232:
226:
185:
183:
168:
166:
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159:
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140:
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124:Observation arc
114:23 March 2018 (
92:
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29:
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1622:(Nova Carinae)
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1432:Kepler-1625b I
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936:Close approach
920:
919:External links
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533:22 in 15 days
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469:94 in 49 days
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1628:(Nova Persei)
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1423:Gliese 1132 c
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1151:Impact events
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1120:
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1081:Mars Cube One
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1013:2018 in space
1008:
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960:Orbit diagram
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1693:46P/Wirtanen
1682:
1620:V906 Carinae
1585:first imaged
1103:(mission to
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758:. Retrieved
756:. 2018-04-17
744:
732:. Retrieved
719:
707:. Retrieved
666:. Retrieved
664:. 2018-03-28
602:
575:41 in 1 day
538:
353:
350:
347:
342:closed orbit
323:
273:
265:
264:
242:
153:Eccentricity
71:Designations
1668:66P/du Toit
1626:V392 Persei
1614:V357 Muscae
1573:FarFarOut (
1545:(announced)
1514:Discoveries
1121:; Dec 2018)
1107:; Oct 2018)
1100:BepiColombo
1087:; May 2018)
1071:; May 2018)
1042:Space probe
846:(10): 143.
411:90377 Sedna
370:(1.44
292:) from the
284:, 6.4
227:10â20
179:Inclination
1827:Categories
1749:(asteroid
1747:OSIRIS-REx
1743:(Nov 2018)
1741:retirement
1726:(Oct 2018)
1724:retirement
1713:(asteroid
1663:37P/Forbes
1596:SN 2018cow
1526:VVV-WIT-07
1495:HD 89345 b
1410:Exoplanets
796:1903.10838
765:(CK18F040)
760:2018-04-17
673:(AK18F040)
668:2018-03-28
641:References
306:Oort cloud
302:perihelion
222:Dimensions
201:0.60
134:Perihelion
118:2458200.5)
45:Pan-STARRS
1758:Voyager 2
1710:Hayabusa2
1653:C/2017 U7
1591:AT2018hyz
1427:possible
1173:Selected
1111:Chang'e 4
952:Ephemeris
944:Discovery
925:C/2018 F4
870:209991168
605:ʻOumuamua
539:C/2018 F4
274:A/2018 F4
233:(assumed)
83:C/2018 F4
1636:Comets
1559:Farout (
1535:10
1505:NGTS-3Ab
1500:KELT-21b
1477:K2-288Bb
1044:launches
821:85517040
734:28 March
709:17 April
703:Archived
395:Velocity
312:Overview
1731:InSight
1576:2018 AG
1562:2018 VG
1472:K2-239d
1467:K2-239c
1462:K2-239b
1457:K2-229b
1452:K2-155d
1447:K2-148b
1442:K2-146b
1437:K2-141b
1429:exomoon
1382:2018 WV
1370:2018 LF
1358:2018 PD
1346:2018 GE
1334:2018 DV
1322:2018 CY
1310:2018 CN
1304:2018 CL
1293:2018 CF
1263:2018 CC
1258:2018 CB
1247:2018 BF
1241:2018 BD
1236:2018 AH
1225:2017 YZ
1213:2017 YE
1201:2017 VR
1189:2010 WC
1159:2018 LA
1105:Mercury
1076:InSight
1064:Queqiao
1032: »
1023:«
927:at the
848:Bibcode
801:Bibcode
404:obs arc
372:billion
282:Jupiter
184:78.2971
158:1.00385
139:3.44584
128:27 days
106:
98:
1722:Kepler
1115:Yutu-2
972:·
970:
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938:
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389:Object
374:
338:0.0072
334:1.0038
171:0.0046
167:1.0130
162:0.0072
143:0.0029
1751:Bennu
1715:Ryugu
1606:Novae
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942:
866:S2CID
817:S2CID
791:arXiv
612:Notes
589:26.49
360:epoch
268:is a
173:(MPC)
164:(JPL)
112:Epoch
1739:Dawn
1175:NEOs
1119:Moon
1085:Mars
1069:Moon
1057:TESS
1030:2019
1025:2017
736:2018
711:2018
593:0.03
585:1982
563:1947
551:0.03
547:2.74
543:1792
529:5.44
525:4.88
521:1855
509:0.00
505:2.99
501:1801
487:0.00
483:2.96
479:1798
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461:2.96
457:1779
445:0.00
441:2.95
437:1765
423:0.00
419:1.99
415:1746
402:and
397:km/s
392:Year
276:, a
250:11.8
197:MOID
188:0.19
1397:220
1284:339
1272:129
903:JPL
856:doi
809:doi
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294:Sun
254:0.5
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