Knowledge (XXG)

G-type main-sequence star

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is a misnomer, because G-type stars actually range in color from white, for more luminous types like the Sun, to only very slightly yellowish for less massive and luminous G-type main-sequence stars. The Sun is in fact white, but it can often appear yellow, orange or red through
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A G-type main-sequence star with the mass of the Sun will fuse hydrogen for approximately 10 billion years, until the hydrogen element is exhausted at the center of the star. When this happens, the star rapidly expands, cooling and darkening as it passes through the
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G-type main sequence stars can provide habitability for life to develop, such as the Sun with life on Earth. They also live long enough to give life enough time to develop, between 13 and 7.9 billion years. Our Sun lives about 10 billion years.
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branch. Expanding even further as helium starts running out as it pulses violently, the star's gravity is not sufficient to hold its outer envelope, resulting in significant mass loss and shedding. The ejected material remains as a
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to which the Earth is gravitationally bound, is an example of a G-type main-sequence star (G2V type). Each second, the Sun fuses approximately 600 million
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B (G3V). The choices of G4 and G6 dwarf standards have changed slightly over the years among expert classifiers, but often-used examples include
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phase, about 1 billion years after leaving the main sequence. After this, the star's degenerate helium core abruptly ignites in a
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Fundamental stellar photometry for standards of spectral type on the revised system of the Yerkes spectral atlas
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spectral standard stars; however, not all of these still exactly conform to this designation.
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dwarf stars, i.e. those standard stars that have remained unchanged over years, are
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branch and ultimately expanding into many times its previous size at the tip of the
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The revised Yerkes Atlas system (Johnson & Morgan 1953) listed 11 G-type
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or bigger, stars similar to the Sun still outshine 90% of the stars in the
1216: 1144:, P.C. Keenan & R.C McNeil, "Astrophysical Journal Supplement Series" 559:(G6V). There are not yet any generally agreed upon G7V and G9V standards. 2424: 2125: 1799: 1558: 1531: 944: 607: 548: 195: 138: 86: 2699: 2174: 1936: 1703: 1656: 1639: 1634: 1553: 603: 75: 1076:"A Modern Mean Dwarf Stellar Color and Effective Temperature Sequence" 30: 2689: 2677: 1896: 1782: 1106:
H.L. Johnson & W.W. Morgan, 1953, Astrophysical Journal, 117, 313
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Dissanaike, George (19 October 1991). "Painting the sky red".
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The Perkins Catalog of Revised MK Types for the Cooler Stars
986:"Evolution from the Main Sequence to Red Giants | Astronomy" 46:(spectral type: G-V), also often, and imprecisely, called a 812:, Mitchell N. Charity's webpage, accessed November 25, 2007 1226: 926:
Hurley, J. R.; Pols, O. R.; Tout, C. A. (1 July 2000).
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Pecaut, Mark J.; Mamajek, Eric E. (1 September 2013).
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Such a star has about 0.9 to 1.1 70:between about 5,300 and 6,000  1170:from the original on 7 August 2011 1148:(October 1989), pp. 245–266. 25: 677:, accessed on line June 19, 2007. 162:'s atmosphere due to atmospheric 2801: 2789: 2777: 2765: 2738: 2728: 2727: 1215: 963:10.1046/j.1365-8711.2000.03426.x 903:"More G Stars | StarDate Online" 210:, and the star passes on to the 105:, the star in the center of the 863:from the original on 2017-10-30 834:from the original on 2012-03-20 174:(which are largely much dimmer 1158:Mullen, Leslie (18 May 2001). 1074:Mamajek, Eric (2 March 2021). 1: 2640:Timeline of stellar astronomy 1194:hyperphysics.phy-astr.gsu.edu 117:(4 hydrogens form 1 helium), 101:when hydrogen runs out. The 2300:Hertzsprung–Russell diagram 625:Hertzsprung–Russell diagram 523:The "anchor points" of the 2845: 2824:G-type main-sequence stars 2214:Kelvin–Helmholtz mechanism 1160:"Galactic Habitable Zones" 566: 525:MK spectral classification 2723: 1477: 1264: 1045:10.1088/0067-0049/208/1/9 990:courses.lumenlearning.com 803:What Color Are the Stars? 700:, accessed June 19, 2007. 660:"Why Does The Sun Shine?" 44:G-type main-sequence star 18:G-type main sequence star 2593:With multiple exoplanets 853:"What Color is the Sun?" 824:"WHAT COLOR IS THE SUN?" 582:Besides the Sun and its 527:system among the G-type 121:about 4 million tons of 93:in its core by means of 78:; 9,100 and 10,000  58:(luminosity class V) of 1379:Asymptotic giant branch 231:Spectral standard stars 2715:Tidal disruption event 2204:Circumstellar envelope 1438:Luminous blue variable 74:(5,000 and 5,700  39: 27:Stellar classification 2240:Effective temperature 1224:at Wikimedia Commons 1164:Astrobiology Magazine 675:Ohio State University 68:effective temperature 33: 2710:Planet-hosting stars 2588:With resolved images 2559:Historical brightest 2489:Photometric-standard 2415:Solar radio emission 2209:Eddington luminosity 1989:Triple-alpha process 1927:Thorne–ƻytkow object 1302:Young stellar object 1125:, Robert F. Garrison 97:, but can also fuse 2534:Highest temperature 2305:Color–color diagram 2170:Protoplanetary disk 1974:Proton–proton chain 1652:Chemically peculiar 1190:"Stellar Lifetimes" 1037:2013ApJS..208....9P 954:2000MNRAS.315..543H 857:Stanford University 237: 164:Rayleigh scattering 115:proton–proton chain 2539:Lowest temperature 2290:Photometric system 2260:Absolute magnitude 2194:Circumstellar dust 1807:Stellar black hole 1443:Stellar population 1329:Herbig–Haro object 1140:2017-10-11 at the 1121:2019-06-25 at the 1102:2019-04-02 at the 808:2017-08-06 at the 761:2019-04-28 at the 738:2019-04-28 at the 715:2019-04-28 at the 710:"Alpha Centauri A" 692:2007-06-16 at the 665:2006-09-09 at the 235: 214:, and then to the 56:main-sequence star 40: 2753: 2752: 2656:Substellar object 2635:Planetary nebulae 2054:Luminous red nova 1964:Deuterium burning 1950: 1949: 1433:Instability strip 1413:Wolf-Rayet nebula 1367:Horizontal branch 1312:Pre-main-sequence 1220:Media related to 784:www.whillyard.com 673:, Astronomy 162, 641:Yellow hypergiant 637:, survey of stars 514: 513: 212:horizontal branch 16:(Redirected from 2836: 2806: 2805: 2804: 2794: 2793: 2792: 2782: 2781: 2770: 2769: 2768: 2761: 2745:Stars portal 2743: 2742: 2731: 2730: 2387:Planetary system 2310:Strömgren sphere 2182:Asteroseismology 1903:Black hole star 1475: 1401:Planetary nebula 1362:Red-giant branch 1251: 1244: 1237: 1228: 1219: 1204: 1203: 1201: 1200: 1186: 1180: 1179: 1177: 1175: 1155: 1149: 1132: 1126: 1116:MK ANCHOR POINTS 1113: 1107: 1094: 1088: 1087: 1085: 1083: 1071: 1065: 1064: 1030: 1006: 1000: 999: 997: 996: 982: 976: 975: 965: 947: 945:astro-ph/0001295 923: 917: 916: 914: 913: 899: 893: 892: 878: 872: 871: 869: 868: 849: 843: 842: 840: 839: 819: 813: 800: 794: 793: 791: 790: 776: 770: 753: 747: 730: 724: 707: 701: 684: 678: 657: 545:61 Ursae Majoris 310: 238: 221:planetary nebula 216:asymptotic giant 188:stellar remnants 21: 2844: 2843: 2839: 2838: 2837: 2835: 2834: 2833: 2814: 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Besides the 95:nuclear fusion 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2841: 2830: 2827: 2825: 2822: 2821: 2819: 2809: 2799: 2797: 2787: 2785: 2780: 2775: 2773: 2763: 2759: 2746: 2741: 2736: 2734: 2726: 2725: 2722: 2716: 2713: 2711: 2708: 2706: 2705:Intergalactic 2703: 2701: 2698: 2696: 2693: 2691: 2688: 2686: 2685:Galactic year 2683: 2679: 2676: 2672: 2669: 2667: 2664: 2663: 2662: 2659: 2658: 2657: 2654: 2653: 2651: 2647: 2641: 2638: 2636: 2633: 2629: 2626: 2624: 2621: 2620: 2619: 2616: 2614: 2611: 2609: 2606: 2604: 2601: 2599: 2596: 2594: 2591: 2589: 2586: 2582: 2579: 2575: 2572: 2571: 2570: 2567: 2565: 2564:Most luminous 2562: 2560: 2557: 2555: 2552: 2550: 2547: 2545: 2542: 2540: 2537: 2535: 2532: 2530: 2527: 2526: 2525: 2522: 2518: 2515: 2513: 2510: 2509: 2508: 2505: 2504: 2502: 2500: 2496: 2490: 2487: 2485: 2482: 2480: 2479:Proper motion 2477: 2475: 2472: 2468: 2465: 2463: 2460: 2458: 2455: 2454: 2453: 2450: 2448: 2445: 2443: 2442:Constellation 2440: 2438: 2435: 2433: 2430: 2426: 2423: 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1616: 1615: 1614: 1611: 1607: 1604: 1602: 1599: 1597: 1594: 1593: 1592: 1589: 1587: 1584: 1580: 1577: 1575: 1572: 1570: 1567: 1566: 1565: 1562: 1560: 1557: 1555: 1552: 1550: 1547: 1543: 1540: 1538: 1535: 1534: 1533: 1530: 1526: 1523: 1521: 1518: 1516: 1513: 1511: 1508: 1506: 1503: 1501: 1498: 1496: 1493: 1492: 1490: 1488: 1485: 1483: 1480: 1479: 1476: 1473: 1471: 1467: 1459: 1456: 1454: 1453:Superluminous 1451: 1450: 1449: 1446: 1444: 1441: 1439: 1436: 1434: 1431: 1429: 1426: 1424: 1421: 1419: 1416: 1414: 1411: 1407: 1404: 1403: 1402: 1399: 1397: 1394: 1390: 1387: 1385: 1382: 1381: 1380: 1377: 1373: 1370: 1369: 1368: 1365: 1363: 1360: 1358: 1357:Main sequence 1355: 1354: 1352: 1350: 1346: 1340: 1337: 1335: 1334:Hayashi track 1332: 1330: 1327: 1323: 1320: 1318: 1315: 1313: 1310: 1308: 1305: 1304: 1303: 1300: 1298: 1295: 1293: 1290: 1288: 1285: 1284: 1282: 1280: 1276: 1270: 1267: 1266: 1263: 1259: 1252: 1247: 1245: 1240: 1238: 1233: 1232: 1229: 1225: 1223: 1222:Yellow dwarfs 1218: 1210: 1195: 1191: 1185: 1182: 1169: 1165: 1161: 1154: 1151: 1147: 1143: 1139: 1136: 1131: 1128: 1124: 1120: 1117: 1112: 1109: 1105: 1101: 1098: 1093: 1090: 1077: 1070: 1067: 1062: 1058: 1054: 1050: 1046: 1042: 1038: 1034: 1029: 1024: 1020: 1016: 1012: 1005: 1002: 991: 987: 981: 978: 973: 969: 964: 959: 955: 951: 946: 941: 937: 933: 929: 922: 919: 908: 904: 898: 895: 890: 886: 885: 884:New Scientist 877: 874: 862: 858: 854: 848: 845: 833: 829: 825: 818: 815: 811: 807: 804: 799: 796: 785: 781: 775: 772: 768: 764: 760: 757: 752: 749: 745: 741: 737: 734: 729: 726: 722: 718: 714: 711: 706: 703: 699: 695: 691: 688: 683: 680: 676: 672: 671:Barbara Ryden 668: 664: 661: 656: 653: 646: 642: 639: 636: 633: 631: 628: 626: 623: 621: 618: 617: 613: 611: 609: 605: 601: 597: 593: 589: 585: 577: 575: 570: 562: 560: 558: 554: 550: 546: 542: 538: 534: 530: 529:main-sequence 526: 521: 519: 509: 506: 503: 500: 497: 494: 493: 489: 486: 483: 480: 477: 474: 473: 469: 466: 463: 460: 457: 454: 453: 449: 446: 443: 440: 437: 434: 433: 429: 426: 423: 420: 417: 414: 413: 409: 406: 403: 400: 397: 394: 393: 389: 386: 383: 380: 377: 374: 373: 369: 366: 363: 360: 357: 354: 353: 349: 346: 343: 340: 337: 334: 333: 329: 326: 323: 320: 317: 314: 313: 306: 301: 297: 292: 289: 280: 277: 274: 265: 262: 259: 250: 247: 245: 240: 239: 230: 228: 226: 222: 217: 213: 209: 205: 201: 197: 191: 189: 185: 181: 177: 176:orange dwarfs 173: 169: 165: 161: 156: 148: 146: 144: 140: 136: 132: 128: 124: 120: 116: 112: 108: 104: 100: 96: 92: 88: 85: 81: 77: 73: 69: 65: 61: 60:spectral type 57: 53: 49: 45: 37: 32: 19: 2808:Solar System 2608:White dwarfs 2598:Brown dwarfs 2581:Most distant 2529:Most massive 2507:Proper names 2467:Photographic 2420:Solar System 2398:observations 2325:Star systems 2148:Stellar wind 2131:Chromosphere 2104:Oscillations 1984:Helium flash 1834:Hypothetical 1812:X-ray binary 1751:Compact star 1586:Bright giant 1514: 1339:Henyey track 1317:Herbig Ae/Be 1214: 1197:. Retrieved 1193: 1184: 1172:. Retrieved 1163: 1153: 1145: 1130: 1111: 1092: 1080:. Retrieved 1069: 1018: 1014: 1004: 993:. Retrieved 989: 980: 935: 931: 921: 910:. Retrieved 907:stardate.org 906: 897: 888: 882: 876: 865:. Retrieved 847: 836:. Retrieved 817: 798: 787:. Retrieved 783: 774: 751: 728: 705: 682: 655: 630:Solar analog 581: 572: 563:Habitability 522: 515: 204:helium flash 192: 184:white dwarfs 155:yellow dwarf 154: 152: 107:Solar System 64:solar masses 51: 48:yellow dwarf 47: 43: 41: 2796:Outer space 2661:Brown dwarf 2437:Circumpolar 2315:Kraft break 2295:Color index 2270:Metallicity 2230:Designation 2199:Cosmic dust 2121:Photosphere 1887:Dark-energy 1862:Electroweak 1847:Black dwarf 1778:Radio-quiet 1761:White dwarf 1647:White dwarf 1297:Bok globule 756:"51 Pegasi" 696:, entry at 669:, lecture, 588:61 Virginis 553:70 Virginis 541:Kappa1 Ceti 535:(G0V), the 296:temperature 225:white dwarf 168:giant stars 149:Description 2829:Star types 2818:Categories 2623:Candidates 2618:Supernovae 2603:Red dwarfs 2462:Extinction 2250:Kinematics 2245:Luminosity 2223:Properties 2116:Atmosphere 2014:Si burning 2004:Ne burning 1942:White hole 1915:Quasi-star 1842:Blue dwarf 1697:Technetium 1613:Hypergiant 1591:Supergiant 1199:2024-07-20 995:2022-04-22 912:2022-04-22 867:2017-11-06 838:2017-11-06 789:2022-04-22 733:"Tau Ceti" 647:References 635:Star count 557:82 Eridani 555:(G4V) and 279:Luminosity 180:red dwarfs 119:converting 2772:Astronomy 2554:Brightest 2452:Magnitude 2432:Pole star 2353:Symbiotic 2348:Eclipsing 2280:Starlight 2081:Structure 2071:Supernova 2064:Micronova 2059:Recurrent 2044:Symbiotic 2029:p-process 2024:r-process 2019:s-process 2009:O burning 1999:C burning 1979:CNO cycle 1922:Gravastar 1458:Hypernova 1448:Supernova 1423:Dredge-up 1396:Blue loop 1389:super-AGB 1372:Red clump 1349:Evolution 1307:Protostar 1287:Accretion 1279:Formation 1061:119308564 1053:0067-0049 1028:1307.2657 604:Cervantes 596:HD 147513 592:HD 102365 294:Effective 200:red giant 172:Milky Way 153:The term 143:51 Pegasi 2733:Category 2628:Remnants 2524:Extremes 2484:Parallax 2457:Apparent 2447:Asterism 2425:Sunlight 2375:Globular 2360:Multiple 2285:Variable 2275:Rotation 2235:Dynamics 2126:Starspot 1800:Magnetar 1743:Remnants 1559:Subgiant 1532:Subdwarf 1384:post-AGB 1168:Archived 1138:Archived 1119:Archived 1100:Archived 1021:(1): 9. 972:18523597 861:Archived 832:Archived 806:Archived 759:Archived 736:Archived 713:Archived 690:Archived 663:Archived 614:See also 608:Tau Ceti 600:Chalawan 549:16 Cygni 287:☉ 272:☉ 257:☉ 242:Spectral 196:subgiant 139:Tau Ceti 87:hydrogen 2758:Portals 2700:Gravity 2649:Related 2569:Nearest 2517:Chinese 2365:Cluster 2338:Contact 2175:Proplyd 2049:Remnant 1937:Blitzar 1911:Hawking 1867:Strange 1817:Burster 1773:Neutron 1726:Extreme 1677:He-weak 1322:T Tauri 1033:Bibcode 950:Bibcode 584:planets 578:Planets 543:(G5V), 539:(G2V), 309:(B − V) 206:fusing 84:element 66:and an 54:, is a 2690:Galaxy 2678:Planet 2666:Desert 2574:bright 2512:Arabic 2333:Binary 2153:Bubble 1877:Planck 1852:Exotic 1788:Binary 1783:Pulsar 1721:Helium 1682:Barium 1625:Carbon 1618:Yellow 1606:Yellow 1579:Yellow 1418:PG1159 1174:1 June 1082:5 July 1059:  1051:  970:  767:SIMBAD 744:SIMBAD 721:SIMBAD 698:ARICNS 264:Radius 208:helium 182:, and 141:, and 127:energy 123:matter 99:helium 91:helium 52:G star 2784:Stars 2695:Guest 2499:Lists 2380:Super 2034:Fusor 1907:Black 1892:Quark 1872:Preon 1857:Boson 1793:X-ray 1709:Shell 1662:Ap/Bp 1564:Giant 1482:Early 1428:OH/IR 1258:Stars 1057:S2CID 1023:arXiv 968:S2CID 940:arXiv 687:"Sun" 533:Chara 518:dwarf 510:0.78 507:5,380 501:0.853 490:0.73 487:5,480 481:0.914 470:0.71 467:5,550 461:0.927 450:0.70 447:5,600 441:0.949 430:0.68 427:5,660 421:0.977 410:0.67 407:5,680 401:0.991 398:0.985 390:0.66 387:5,720 381:1.002 370:0.65 367:5,770 361:1.012 350:0.62 347:5,860 341:1.060 330:0.60 327:5,930 321:1.100 305:index 303:Color 160:Earth 50:, or 2370:Open 2265:Mass 2089:Core 2039:Nova 1932:Iron 1882:Dark 1692:Lead 1672:HgMn 1667:CEMP 1596:Blue 1569:Blue 1487:Late 1269:List 1176:2020 1084:2021 1049:ISSN 606:and 504:0.55 498:0.90 484:0.68 478:0.94 464:0.74 458:0.95 444:0.79 438:0.97 424:0.89 418:0.98 404:0.91 384:0.98 378:0.99 364:1.02 358:1.00 344:1.20 338:1.03 324:1.35 318:1.06 299:(K) 249:Mass 244:type 111:tons 34:The 2671:Sub 2405:Sun 1824:SGR 1601:Red 1574:Red 1041:doi 1019:208 958:doi 936:315 889:132 537:Sun 495:G9V 475:G8V 455:G7V 435:G6V 415:G5V 395:G4V 375:G3V 355:G2V 335:G1V 315:G0V 190:). 131:Sun 125:to 103:Sun 89:to 36:Sun 2820:: 1704:Be 1657:Am 1640:CH 1635:CN 1554:OB 1549:WR 1192:. 1166:. 1162:. 1146:71 1055:. 1047:. 1039:. 1031:. 1017:. 1013:. 988:. 966:. 956:. 948:. 934:. 930:. 905:. 887:. 859:. 855:. 830:. 826:. 782:. 765:, 742:, 719:, 610:. 602:, 598:, 594:, 590:, 290:) 275:) 260:) 178:, 145:. 137:, 80:°F 76:°C 42:A 2760:: 1897:Q 1716:B 1630:S 1542:B 1537:O 1525:M 1520:K 1515:G 1510:F 1505:A 1500:B 1495:O 1250:e 1243:t 1236:v 1202:. 1178:. 1086:. 1063:. 1043:: 1035:: 1025:: 998:. 974:. 960:: 952:: 942:: 915:. 870:. 841:. 792:. 284:L 281:( 269:R 266:( 254:M 251:( 72:K 20:)

Index

G-type main sequence star

Sun
main-sequence star
spectral type
solar masses
effective temperature
K
°C
°F
element
hydrogen
helium
nuclear fusion
helium
Sun
Solar System
tons
proton–proton chain
converting
matter
energy
Sun
Alpha Centauri
Tau Ceti
51 Pegasi
Earth
Rayleigh scattering
giant stars
Milky Way

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