 V4998 Sagittarii and its surrounding shell nebula. The nebula appears as a transparent bubble-like body encircling the star. Credit: HST\NIMCOS | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 17h 46m 05.625s[1] |
| Declination | −28° 51′ 31.92″[1] |
| Characteristics | |
| Evolutionary stage | LBV[2][3] |
| Apparent magnitude (B) | 19.5[1] |
| Apparent magnitude (R) | 17.2[1] |
| Apparent magnitude (J) | 12.534[1] |
| Apparent magnitude (H) | 9.239[1] |
| Apparent magnitude (K) | 7.462[1] |
| Variable type | LBV[2] |
| Astrometry | |
| Distance | 8,000[2] pc |
| Details | |
| Radius | 463[a] R☉ |
| Luminosity | 4,000,000[2] L☉ |
| Temperature | 12,000[4] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
V4998 Sagittarii is a luminous blue variable star (LBV) in the constellation of Sagittarius. Located some 25,000 light-years away, the star is positioned about 7 pc (23 ly) away from a starburst cluster known as the Quintuplet cluster. It has an ejection nebula measuring over 0.8 pc in diameter, formed 5000-10,000 years ago through large eruptions. The star has a large mass comparable to the Pistol Star and a luminosity of around 4 million times the Sun (L☉). This places the star as one of the most massive and luminous stars known.
- ^ a b c d e f g 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. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
- ^ a b c d Mauerhan, J. C.; Morris, M. R.; Cotera, A.; Dong, H.; Wang, Q. D.; et al. (April 2010). "Discovery of a Luminous Blue Variable with an Ejection Nebula Near the Quintuplet Cluster". The Astrophysical Journal. 713 (1): L33–L36. arXiv:1002.3379. Bibcode:2010ApJ...713L..33M. doi:10.1088/2041-8205/713/1/L33. S2CID 42696538.
- ^ Clark, J. S.; Lohr, M. E.; Patrick, L. R.; Najarro, F.; Dong, H.; Figer, D. F. (2018). "An updated stellar census of the Quintuplet cluster". Astronomy and Astrophysics. 618: A2. arXiv:1805.10139. Bibcode:2018A&A...618A...2C. doi:10.1051/0004-6361/201833041. S2CID 53501337.
- ^ Lau, R. M.; Herter, T. L.; Morris, M. R.; Adams, J. D. (2014). "Nature Versus Nurture: Luminous Blue Variable Nebulae in and Near Massive Stellar Clusters at the Galactic Center". The Astrophysical Journal. 785 (2): 120. arXiv:1403.5298. Bibcode:2014ApJ...785..120L. doi:10.1088/0004-637X/785/2/120. S2CID 118447462.
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