1704:
602:, meaning that every time the outer planet orbits the star three times, the inner planet orbits the star four times. The two planets are separated by only 0.35 AU. Because of the small separation between the two massive planets, the gravitational tugs between the two planets is nearly 3 million times greater than the
610:
measurements were taken stable solutions in the 7:5 and 3:2 mean-motion resonances were found in addition to the 4:3 mean-motion resonance. The 7:5 configuration currently provides the best match to the measurements.
1239:
614:
There is evidence of a possible third planet in the system with a period of ~7 days however the three planet model of the system is only slightly better than the two planet model.
591:. The inner planet is nearly twice as massive as Jupiter and takes 614 days to orbit the star in a circular orbit at the average distance of 1.60 AU (240 Gm). The outer planet is /
1731:
461:
1216:
341:
567:, is lower than in the Sun. The star has swelled to 4.3 times the radius of the Sun and it is radiating nearly 14 times the Sun's luminosity from its enlarged
606:
between Earth and Mars, 700 times larger than that between Earth and the Moon, and 4 times larger than the pull of the Sun on Earth. After additional
1751:
584:
1380:
1707:
1333:
1104:"Retired A Stars and Their Companions. VI. A Pair of Interacting Exoplanet Pairs Around the Subgiants 24 Sextanis and HD 200964"
1741:
31:
635:
595:
the mass of
Jupiter and takes 825 days to orbit eccentrically around the star at the average distance of 1.95 AU (292 Gm).
1400:
560:
387:
1328:
1756:
830:
598:
Due to the close proximity of the two planets to each other the discoverers only found stable orbits near the 4:3
1726:
1500:
1405:
1271:"Measuring the Orbital Parameters of Radial Velocity Systems in Mean-motion Resonance: A Case Study of HD 200964"
510:
976:
1389:
1746:
1571:
1373:
1026:
Soubiran, C.; et al. (2018). "Gaia Data
Release 2. The catalogue of radial velocity standard stars".
540:
453:
93:
1669:
1528:
1472:
572:
447:
349:
1292:
1178:
1125:
1045:
1005:
996:
Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars".
948:
880:
661:
202:
666:
603:
457:
543:
of G8 IV. It is a 3.3 billion year old star that has exhausted the supply of hydrogen at its
1310:
1282:
1244:
1168:
1115:
1061:
1035:
966:
938:
896:
870:
223:
76:
1736:
1424:
1366:
1206:
641:
599:
548:
482:
442:
412:
27:
1300:
1186:
1135:
1053:
1049:
956:
952:
888:
518:
379:
312:
186:
587:
team announced the discovery of two planets around HD 200964 along with two planets around
1452:
607:
526:
325:
130:
52:
1296:
1182:
1130:
1009:
884:
806:
732:
648:
434:
194:
174:
162:
1720:
1447:
1442:
1432:
1314:
1140:
1103:
970:
900:
552:
536:
502:
151:
39:
1065:
1437:
825:
759:
693:
588:
544:
288:
253:
1057:
961:
922:
568:
564:
556:
533:
368:
104:
65:
1305:
1270:
1191:
1156:
513:
of +6.48, which puts it at the lower limit of visibility to the naked eye, but
1646:
1518:
892:
861:
Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation".
522:
514:
301:
264:
209:
118:
1638:
1599:
1594:
1589:
1579:
1561:
1556:
1551:
1546:
1541:
1536:
1513:
1508:
1490:
1485:
1480:
1462:
1457:
1358:
498:
1687:
1682:
1677:
1615:
1338:
506:
423:
44:
1240:"Astronomers find planets in unusually intimate dance around dying star"
1620:
1660:
1211:
980:
671:
476:
360:
277:
214:
1157:"Revised Exoplanet Radii and Habitability Using Gaia Data Release 2"
563:
of 2.3 km/s. The abundance of iron, an indicator of the star's
1287:
1173:
1040:
943:
1120:
875:
559:. The star has 44% more mass than the Sun and is spinning with a
1415:
630:
494:
178:
166:
1362:
654:
927:
Data
Release 3. Summary of the content and survey properties"
921:
Vallenari, A.; et al. (Gaia collaboration) (2023).
856:
854:
852:
850:
848:
846:
521:
measurements, the distance to this system is 238
1021:
1019:
1668:
1659:
1637:
1608:
1570:
1527:
1499:
1471:
1423:
1414:
991:
989:
525:, but it is drifting closer with a heliocentric
1264:
1262:
1097:
1095:
1374:
1217:Centre de données astronomiques de Strasbourg
1093:
1091:
1089:
1087:
1085:
1083:
1081:
1079:
1077:
1075:
8:
1732:Planetary systems with two confirmed planets
1155:Johns, Daniel; et al. (November 2018).
1161:The Astrophysical Journal Supplement Series
70:+03° 48′ 11.23″
1665:
1634:
1420:
1381:
1367:
1359:
1234:
1232:
1304:
1286:
1190:
1172:
1139:
1129:
1119:
1102:Johnson, John Asher; et al. (2011).
1039:
960:
942:
916:
914:
912:
910:
874:
30:J2000
616:
842:
158:
1269:Rosenthal, M. M.; et al. (2019).
18:
585:California and Carnegie Planet Search
7:
517:would make it easy to see. Based on
170:
16:Star in the constellation Equuleus
14:
1703:
1702:
1334:Extrasolar Planets Encyclopaedia
193:13.7656 ± 0.0275
977:Gaia DR3 record for this source
618:The HD 200964 planetary system
1752:Henry Draper Catalogue objects
1:
1401:Equuleus in Chinese astronomy
561:projected rotational velocity
670:
665:
660:
647:
634:
629:
622:
1058:10.1051/0004-6361/201832795
962:10.1051/0004-6361/202243940
1773:
1141:10.1088/0004-6256/141/1/16
1028:Astronomy and Astrophysics
931:Astronomy and Astrophysics
831:List of extrasolar planets
1700:
1633:
1406:List of stars in Equuleus
1396:
1390:Constellation of Equuleus
893:10.1134/S1063773712050015
511:apparent visual magnitude
469:
440:
433:
429:
247:
242:
238:
124:
117:
87:
24:
1306:10.3847/1538-3881/ab3b02
1275:The Astronomical Journal
1192:10.3847/1538-4365/aae5fb
1108:The Astronomical Journal
998:Michigan Spectral Survey
501:located in the northern
497:with a pair of orbiting
1329:"Notes for star 24 Sex"
1050:2018A&A...616A...7S
953:2023A&A...674A...1G
224:Absolute magnitude
77:Apparent magnitude
1742:Durchmusterung objects
541:stellar classification
583:On July 26, 2010 the
573:effective temperature
626:(in order from star)
529:of −72.6 km/s.
1297:2019AJ....158..136R
1183:2018ApJS..239...14J
1131:2011AJ....141...16J
1010:1999MSS...C05....0H
885:2012AstL...38..331A
619:
604:gravitational force
470:Database references
388:Rotational velocity
21:
1245:Astronomy Magazine
617:
555:, where it was an
435:Other designations
173: 50.418
161: 94.748
94:Spectral type
19:
1757:Hipparcos objects
1714:
1713:
1696:
1695:
1655:
1654:
1629:
1628:
1341:on August 4, 2010
863:Astronomy Letters
817:
816:
658:
645:
627:
575:of 5,164 K.
547:and has begun to
488:
487:
213:(72.6 ± 0.1
208:236.9 ± 0.5
1764:
1727:G-type subgiants
1706:
1705:
1666:
1635:
1421:
1383:
1376:
1369:
1360:
1350:
1349:
1347:
1346:
1337:. Archived from
1325:
1319:
1318:
1308:
1290:
1266:
1257:
1256:
1254:
1253:
1236:
1227:
1226:
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1203:
1197:
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1194:
1176:
1152:
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1145:
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1123:
1099:
1070:
1069:
1043:
1023:
1014:
1013:
993:
984:
974:
964:
946:
918:
905:
904:
878:
858:
809:
799:
798:
788:
787:
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762:
757:
756:
735:
725:
724:
714:
713:
696:
691:
690:
652:
639:
625:
620:
579:Planetary system
451:
421:
405:
377:
358:
339:
310:
286:
262:
172:
160:
144:
112:
88:Characteristics
80:
60:
55:
25:Observation data
22:
1772:
1771:
1767:
1766:
1765:
1763:
1762:
1761:
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1715:
1710:
1692:
1651:
1625:
1604:
1566:
1523:
1495:
1467:
1410:
1392:
1387:
1356:
1354:
1353:
1344:
1342:
1327:
1326:
1322:
1268:
1267:
1260:
1251:
1249:
1248:. July 29, 2010
1238:
1237:
1230:
1221:
1219:
1205:
1204:
1200:
1154:
1153:
1149:
1101:
1100:
1073:
1025:
1024:
1017:
995:
994:
987:
920:
919:
908:
860:
859:
844:
839:
822:
812:
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797:
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786:
783:
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781:
775:
772:
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738:
733:
723:
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719:
718:
712:
709:
708:
707:
699:
694:
689:
686:
685:
684:
651:
638:
624:
608:radial velocity
594:
581:
527:radial velocity
465:
446:
419:
403:
394: sin
375:
356:
337:
326:Surface gravity
318:
315:
308:
294:
291:
284:
270:
267:
260:
229:
212:
169:
142:
136:
131:Radial velocity
110:
75:
58:
53:Right ascension
51:
26:
17:
12:
11:
5:
1770:
1768:
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1759:
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1597:
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1511:
1505:
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1363:
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1015:
985:
906:
841:
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838:
835:
834:
833:
828:
821:
818:
815:
814:
810:
803:
800:
795:
789:
784:
778:
773:
767:
763:
753:
747:
741:
740:
736:
729:
726:
721:
715:
710:
704:
703:1.601 ± 0.002
701:
697:
687:
681:
675:
674:
669:
664:
659:
649:Orbital period
646:
636:Semimajor axis
633:
628:
592:
580:
577:
551:away from the
486:
485:
480:
472:
471:
467:
466:
460: 104202,
456: 200964,
441:
438:
437:
431:
430:
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383:
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372:
364:
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321:
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182:
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156:
147:
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145:0.03 km/s
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15:
13:
10:
9:
6:
4:
3:
2:
1769:
1758:
1755:
1753:
1750:
1748:
1747:Gould objects
1745:
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1016:
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1007:
1003:
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972:
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945:
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936:
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917:
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868:
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849:
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843:
836:
832:
829:
827:
824:
823:
819:
813:
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801:
790:
779:
768:
766:
748:
746:
743:
742:
739:
730:
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682:
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677:
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673:
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632:
621:
615:
612:
609:
605:
601:
596:
590:
586:
578:
576:
574:
570:
566:
562:
558:
554:
553:main sequence
550:
546:
542:
538:
537:subgiant star
535:
530:
528:
524:
520:
516:
512:
508:
504:
503:constellation
500:
496:
492:
484:
481:
479:
478:
474:
473:
468:
464: 126546
463:
459:
455:
449:
444:
439:
436:
432:
428:
425:
417:
415:
414:
410:
409:
406:0.5 km/s
401:
399:
397:
393:
389:
385:
384:
381:
373:
371:
370:
366:
365:
362:
354:
352:
351:
347:
346:
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335:
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327:
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319:
306:
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299:
298:
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274:
271:
258:
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155:
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152:Proper motion
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57:
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50:
49:
46:
43:
41:
40:Constellation
38:
37:
33:
29:
23:
1584:
1433:α (Kitalpha)
1355:
1343:. Retrieved
1339:the original
1332:
1323:
1278:
1274:
1250:. Retrieved
1243:
1220:. Retrieved
1210:
1201:
1164:
1160:
1150:
1111:
1107:
1031:
1027:
1001:
997:
934:
930:
924:
866:
862:
826:24 Sextantis
796:−0.017
774:−0.005
744:
678:
662:Eccentricity
613:
597:
589:24 Sextantis
582:
531:
509:. It has an
490:
489:
475:
411:
395:
391:
386:
367:
348:
329:
324:
300:
276:
252:
222:
201:
185:
150:
129:
59:21 06 39.842
1207:"HD 200964"
754:−0.06
722:−0.02
688:−0.08
667:Inclination
569:photosphere
565:metallicity
557:A-type star
523:light years
369:Metallicity
350:Temperature
311:0.064
105:color index
98:G8 IV
66:Declination
1721:Categories
1647:MASCARA-1b
1639:Exoplanets
1345:2011-01-13
1288:1908.04789
1281:(4). 136.
1252:2011-01-13
1222:2019-09-15
1174:1808.04533
1041:1804.09370
944:2208.00211
869:(5): 331.
837:References
805:0.85
785:−5.1
731:0.85
711:−1.4
532:This is a
515:binoculars
499:exoplanets
378:0.04
328:(log
302:Luminosity
287:0.09
263:0.09
119:Astrometry
20:HD 200964
1473:Flamsteed
1315:199577752
1167:(1): 14.
1121:1007.4552
1114:(1). 16.
971:244398875
901:119257644
876:1108.4971
623:Companion
600:resonance
491:HD 200964
443:10 G. Equ
422:0.6
340:0.1
79: (V)
1737:Equuleus
1708:Category
1661:Galaxies
1616:HAT-P-65
1501:Variable
1066:52952408
820:See also
519:parallax
507:Equuleus
450:+03°4501
359:44
317:☉
293:☉
269:☉
226: (M
203:Distance
187:Parallax
45:Equuleus
1621:WASP-90
1293:Bibcode
1179:Bibcode
1126:Bibcode
1046:Bibcode
1006:Bibcode
949:Bibcode
881:Bibcode
539:with a
243:Details
32:Equinox
1600:203473
1595:202908
1590:201585
1585:200964
1580:200779
1313:
1212:SIMBAD
1064:
1034:: A7.
981:VizieR
969:
937:: A1.
899:
758:
692:
672:Radius
571:at an
549:evolve
534:G-type
477:SIMBAD
307:13.758
278:Radius
141:−72.63
113:0.009
83:+6.48
34:J2000
1609:Other
1425:Bayer
1416:Stars
1311:S2CID
1283:arXiv
1195:. 14.
1169:arXiv
1116:arXiv
1062:S2CID
1036:arXiv
975:
967:S2CID
939:arXiv
897:S2CID
871:arXiv
791:0.181
780:825.0
769:1.950
749:≥0.90
706:613.8
683:≥1.85
493:is a
374:−0.15
355:5,164
171:Dec.:
109:0.880
28:Epoch
1688:7046
1683:7040
1678:7015
1562:8191
1557:8149
1552:8095
1547:8090
1542:8067
1537:8038
925:Gaia
717:0.04
655:days
631:Mass
545:core
495:star
483:data
402:2.28
283:4.30
259:1.44
254:Mass
234:2.19
103:B−V
1670:NGC
1301:doi
1279:158
1187:doi
1165:239
1136:doi
1112:141
1054:doi
1032:616
979:at
957:doi
935:674
889:doi
505:of
462:SAO
458:HIP
424:Gyr
418:3.0
413:Age
380:dex
342:cgs
336:3.6
195:mas
189:(π)
175:mas
163:mas
159:RA:
154:(μ)
1723::
1572:HD
1529:HR
1519:SY
1331:.
1309:.
1299:.
1291:.
1277:.
1273:.
1261:^
1242:.
1231:^
1215:.
1209:.
1185:.
1177:.
1163:.
1159:.
1134:.
1124:.
1110:.
1106:.
1074:^
1060:.
1052:.
1044:.
1030:.
1018:^
1004:.
1000:.
988:^
965:.
955:.
947:.
933:.
929:.
909:^
895:.
887:.
879:.
867:38
865:.
845:^
802:—
728:—
642:AU
593:10
454:HD
452:,
448:BD
445:,
215:pc
210:ly
179:yr
167:yr
133:(R
1514:U
1509:R
1491:9
1486:6
1481:4
1463:λ
1458:ζ
1453:ε
1448:δ
1443:γ
1438:β
1382:e
1375:t
1368:v
1348:.
1317:.
1303::
1295::
1285::
1255:.
1225:.
1189::
1181::
1171::
1144:.
1138::
1128::
1118::
1068:.
1056::
1048::
1038::
1012:.
1008::
1002:5
983:.
973:.
959::
951::
941::
923:"
903:.
891::
883::
873::
811:J
808:R
764:J
761:M
745:c
737:J
734:R
698:J
695:M
679:b
657:)
653:(
644:)
640:(
420:±
404:±
398:)
396:i
392:v
390:(
376:±
361:K
357:±
338:±
332:)
330:g
314:L
309:±
290:R
285:±
266:M
261:±
230:)
228:V
217:)
177:/
165:/
143:±
137:)
135:v
111:±
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