410:
equipped with the High-Resolution
Spectrograph in a queue-scheduled mode. From July 2004 to October 2009, 40 epochs were measured, with SNR values ranging from 161 to 450. These observations eventually led the team to conclude that there was in fact a planetary companion orbiting around HD 240237,
537:
Gettel, S.; Wolszczan, A.; Niedzielski, A.; Nowak, G.; Adamów, M.; Zieliński, P.; Maciejewski, G. (2012-01-20). "Substellar-Mass
Companions to the K-Giants HD 240237, BD +48 738 and HD 96127".
640:
Gettel, S.; Wolszczan, A.; Niedzielski, A.; Nowak, G.; Adamów, M.; Zieliński, P.; Maciejewski, G. (2011). "Substellar-Mass
Companions to the K-Giants HD 240237, BD +48 738 and HD 96127".
403:, the method of observing exoplanets through the measurement of radial velocities of a star. If there is a wobble, it could mean that there is a possible planetary companion orbiting it.
361:
and is likely 2 billion years old based on its mass and evolution. In comparison, the Sun is about 4.6 billion years old and has a surface temperature of 5778 K.
744:
739:
729:
702:
39:
368:, or how bright it appears from Earth's perspective, is 8.19. Therefore, HD 240237 is too dim to be seen with the naked eye.
60:
407:
512:
242:
391:' orbital distance from the Sun, which is 1.52 AU). It has a mildly eccentric orbit, with an eccentricity of 0.4.
149:
294:. It has a temperature of 781 K (508 °C; 946 °F), around that of the surface temperature of
734:
328:
109:
659:
556:
476:
400:
250:
71:
45:
675:
649:
546:
466:
365:
572:
494:
416:
384:
246:
616:
667:
564:
484:
52:
455:"Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes"
428:
254:
591:
663:
560:
480:
595:
156:
82:
415:, an orbital period of 746 days, an eccentricity of 0.4, and a semi-major axis of 1.9
723:
679:
671:
568:
283:
258:
209:
419:. The discovery, along with 2 other exoplanets, were announced on October 9, 2011.
178:
697:
190:
489:
454:
343:
supply in its core and is currently fusing helium. The star has a mass of 1.69
332:
286:", an exoplanet that has a radius and mass larger than that of the gas giants
223:
216:
576:
498:
376:
HD 240237 b orbits its star with nearly 331 times the Sun's luminosity (331
336:
219:
212:
135:
121:
245:. It orbits outside of the habitable zone of its star at a distance of 1.9
340:
262:
412:
287:
319:) based on its mass, since it is more massive than the jovian planet.
453:
Stassun, Keivan G.; Collins, Karen A.; Gaudi, B. Scott (2017-03-01).
358:
291:
266:
227:
411:
and they estimated its parameters to be a mass of 5.3 times that of
471:
654:
551:
295:
97:
388:
168:
305:
and a potential radius of around 9% larger than
Jupiter (1.11
89:
238:
269:
parent star. The planet has a mildly eccentric orbit.
189:
167:
147:
142:
131:
119:
107:
95:
80:
70:
58:
51:
37:
29:
24:
8:
19:
635:
633:
298:. It has an estimated mass of around 15.89
653:
550:
488:
470:
440:
249:. The exoplanet was found by using the
241:) away from Earth in the constellation
745:Exoplanets detected by radial velocity
383:) every 746 days at a distance of 1.9
357:. It has a surface temperature of 4361
18:
195:781 K (508 °C; 946 °F)
7:
448:
446:
444:
615:Fraser Cain (September 15, 2008).
14:
590:Fraser Cain (16 September 2008).
406:Observations were taken with the
66:1.9 AU (280,000,000 km)
703:Extrasolar Planets Encyclopaedia
399:The planet was detected through
257:measurements via observation of
698:"Notes for planet HD 240237 b"
1:
740:Exoplanets discovered in 2011
278:Mass, radius and temperature
110:Argument of periastron
761:
730:Cassiopeia (constellation)
672:10.1088/0004-637X/745/1/28
569:10.1088/0004-637X/745/1/28
350:and a radius of around 71
642:The Astrophysical Journal
539:The Astrophysical Journal
199:
83:Orbital period (sidereal)
617:"Temperature of the Sun"
490:10.3847/1538-3881/aa5df3
459:The Astronomical Journal
143:Physical characteristics
339:. It has exhausted the
98:Time of periastron
53:Orbital characteristics
16:Super-Jupiter exoplanet
408:Hobby–Eberly Telescope
251:radial velocity method
592:"How Old is the Sun?"
327:The planet orbits a (
401:Doppler spectroscopy
46:Doppler spectroscopy
664:2012ApJ...745...28G
561:2012ApJ...745...28G
481:2017AJ....153..136S
30:Discovery date
21:
366:apparent magnitude
282:HD 240237 b is a "
217:K-type giant star
203:
202:
752:
713:
711:
710:
684:
683:
657:
637:
628:
627:
625:
624:
619:. Universe Today
612:
606:
605:
603:
602:
587:
581:
580:
554:
534:
528:
527:
525:
523:
509:
503:
502:
492:
474:
450:
237:
235:
176:
124:
40:Detection method
22:
760:
759:
755:
754:
753:
751:
750:
749:
720:
719:
717:
708:
706:
696:
693:
688:
687:
639:
638:
631:
622:
620:
614:
613:
609:
600:
598:
589:
588:
584:
536:
535:
531:
521:
519:
511:
510:
506:
452:
451:
442:
437:
429:Epsilon Tauri b
425:
397:
382:
379:
374:
356:
353:
349:
346:
325:
318:
315:
311:
308:
304:
301:
280:
275:
273:Characteristics
255:radial-velocity
233:
231:
184:
181:
174:
162:
159:
152:
120:
112:
100:
88:745.7 (± 13.8)
85:
63:
61:Semi-major axis
42:
17:
12:
11:
5:
758:
756:
748:
747:
742:
737:
732:
722:
721:
715:
714:
692:
691:External links
689:
686:
685:
629:
607:
596:Universe Today
582:
529:
513:"HEC Orbit HD"
504:
439:
438:
436:
433:
432:
431:
424:
421:
396:
393:
380:
377:
373:
370:
354:
351:
347:
344:
324:
321:
316:
313:
309:
306:
302:
299:
279:
276:
274:
271:
259:Doppler shifts
201:
200:
197:
196:
193:
187:
186:
182:
179:
171:
165:
164:
160:
157:
153:
148:
145:
144:
140:
139:
133:
129:
128:
125:
122:Semi-amplitude
117:
116:
113:
108:
105:
104:
101:
96:
93:
92:
86:
81:
78:
77:
74:
68:
67:
64:
59:
56:
55:
49:
48:
43:
38:
35:
34:
33:9 October 2011
31:
27:
26:
15:
13:
10:
9:
6:
4:
3:
2:
757:
746:
743:
741:
738:
736:
735:Giant planets
733:
731:
728:
727:
725:
718:
705:
704:
699:
695:
694:
690:
681:
677:
673:
669:
665:
661:
656:
651:
647:
643:
636:
634:
630:
618:
611:
608:
597:
593:
586:
583:
578:
574:
570:
566:
562:
558:
553:
548:
544:
540:
533:
530:
518:
514:
508:
505:
500:
496:
491:
486:
482:
478:
473:
468:
464:
460:
456:
449:
447:
445:
441:
434:
430:
427:
426:
422:
420:
418:
414:
409:
404:
402:
394:
392:
390:
387:(compared to
386:
371:
369:
367:
362:
360:
342:
338:
334:
330:
322:
320:
297:
293:
289:
285:
284:super-Jupiter
277:
272:
270:
268:
264:
260:
256:
252:
248:
244:
240:
229:
225:
221:
218:
215:orbiting the
214:
211:
210:super-Jupiter
207:
198:
194:
192:
188:
185:
172:
170:
166:
163:
154:
151:
146:
141:
138:(BD+57° 2714)
137:
134:
130:
126:
123:
118:
114:
111:
106:
103:54,292 ± 28.3
102:
99:
94:
91:
87:
84:
79:
75:
73:
69:
65:
62:
57:
54:
50:
47:
44:
41:
36:
32:
28:
23:
716:
707:. Retrieved
701:
645:
641:
621:. Retrieved
610:
599:. Retrieved
585:
542:
538:
532:
520:. Retrieved
517:hpcf.upr.edu
516:
507:
462:
458:
405:
398:
375:
363:
326:
281:
230:, or nearly
222:about 4,900
205:
204:
115:108.1 ± 21.8
72:Eccentricity
364:The star's
224:light-years
206:HD 240237 b
191:Temperature
150:Mean radius
127:91.5 ± 12.8
76:0.4 (± 0.1)
20:HD 240237 b
724:Categories
709:2016-07-29
623:2011-02-19
601:2011-02-19
472:1609.04389
465:(3): 136.
435:References
333:giant star
312:, or 12.2
243:Cassiopeia
680:119116402
655:1110.1641
648:(1): 28.
577:0004-637X
552:1110.1641
545:(1): 28.
499:0004-6256
395:Discovery
337:HD 240237
323:Host star
220:HD 240237
213:exoplanet
136:HD 240237
25:Discovery
522:18 April
423:See also
381:☉
355:☉
348:☉
341:hydrogen
267:planet's
263:spectrum
660:Bibcode
557:Bibcode
477:Bibcode
413:Jupiter
288:Jupiter
265:of the
261:in the
253:, from
228:parsecs
226:(1,500
678:
575:
497:
335:named
329:K-type
292:Saturn
155:~1.11
676:S2CID
650:arXiv
547:arXiv
467:arXiv
372:Orbit
296:Venus
208:is a
177:5.58
173:15.89
573:ISSN
524:2023
495:ISSN
389:Mars
290:and
169:Mass
132:Star
668:doi
646:745
565:doi
543:745
485:doi
463:153
232:4.6
726::
700:.
674:.
666:.
658:.
644:.
632:^
594:.
571:.
563:.
555:.
541:.
515:.
493:.
483:.
475:.
461:.
457:.
443:^
417:AU
385:AU
331:)
317:🜨
247:AU
239:km
236:10
712:.
682:.
670::
662::
652::
626:.
604:.
579:.
567::
559::
549::
526:.
501:.
487::
479::
469::
378:L
359:K
352:R
345:M
314:R
310:J
307:R
303:J
300:M
234:×
183:J
180:M
175:±
161:J
158:R
90:d
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.