V4998 Sagittarii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 17h 46m 05.625s |
| Declination | −28° 51′ 31.92″ |
| Characteristics | |
| Evolutionary stage | LBV |
| Apparent magnitude (B) | 19.5 |
| Apparent magnitude (R) | 17.2 |
| Apparent magnitude (J) | 12.534 |
| Apparent magnitude (H) | 9.239 |
| Apparent magnitude (K) | 7.462 |
| Variable type | LBV |
| Astrometry | |
| Distance | 8,000 pc |
| Details | |
| Radius | 463 R☉ |
| Luminosity | 4,000,000 L☉ |
| Temperature | 12,000 K |
| Other designations | |
| V4998 Sagittarii, LBV G0.120-0.048, LBV3, 2MASS J17460562-2851319, SSTGC 595621 | |
| 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.