人馬座V4998
 V4998 Sagittarii and its surrounding shell nebula. The nebula appears as a transparent bubble-like body encircling the star. 图片来源：HST\NIMCOS | |
| 觀測資料 曆元 J2000 | |
|---|---|
| 星座 | 人馬座 |
| 星官 | |
| 赤經 | 17h 46m 05.625s[1] |
| 赤緯 | -28° 51′ 31.92″[1] |
| 視星等（V） | |
| 特性 | |
| 演化阶段 | LBV[2][3] |
| 视星等 (B) | 19.5[1] |
| 视星等 (R) | 17.2[1] |
| 视星等 (J) | 12.534[1] |
| 视星等 (H) | 9.239[1] |
| 视星等 (K) | 7.462[1] |
| 变星类型 | 亮藍變星[2] |
| 天体测定 | |
| 距离 | 8,000[2] pc |
| 詳細資料 | |
| 半徑 | 463[a] R☉ |
| 亮度 | 4,000,000[2] L☉ |
| 溫度 | 12,000[4] K |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 资料 |
人馬座V4998（V4998 Sagittarii）是人馬座一顆的亮藍變星。人馬座V4998距離地球約25,000光年，距離五合星團約7秒差距（23光年）。人馬座V4998有一個直徑超過0.8 pc的彈射星雲，形成於5000-10,000年前的大規模噴發。人馬座V4998的質量與手槍星相當，光度約為太陽的400萬倍。人馬座V4998為已知質量最大、亮度最高的恆星之一。
參考資料
[编辑]- ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003). CDS/ADC Collection of Electronic Catalogues. 2003, 2246: II/246. Bibcode:2003yCat.2246....0C.
- ^ 2.0 2.1 2.2 2.3 Mauerhan, J. C.; Morris, M. R.; Cotera, A.; Dong, H.; Wang, Q. D.; et al. Discovery of a Luminous Blue Variable with an Ejection Nebula Near the Quintuplet Cluster. The Astrophysical Journal. April 2010, 713 (1): L33–L36. Bibcode:2010ApJ...713L..33M. S2CID 42696538. arXiv:1002.3379
. doi:10.1088/2041-8205/713/1/L33.
- ^ Clark, J. S.; Lohr, M. E.; Patrick, L. R.; Najarro, F.; Dong, H.; Figer, D. F. An updated stellar census of the Quintuplet cluster. Astronomy and Astrophysics. 2018, 618: A2. Bibcode:2018A&A...618A...2C. S2CID 53501337. arXiv:1805.10139 . doi:10.1051/0004-6361/201833041.
- ^ Lau, R. M.; Herter, T. L.; Morris, M. R.; Adams, J. D. Nature Versus Nurture: Luminous Blue Variable Nebulae in and Near Massive Stellar Clusters at the Galactic Center. The Astrophysical Journal. 2014, 785 (2): 120. Bibcode:2014ApJ...785..120L. S2CID 118447462. arXiv:1403.5298 . doi:10.1088/0004-637X/785/2/120.
