Stephenson 2 DFK 1
Stephenson 2 DFK 1, also known as RSGC2-01 or St2-18, is a red supergiant (RSG) or possible extreme red hypergiant (RHG) star in the constellation of Scutum. It lies near the open cluster Stephenson 2, which is located about 5.8 kiloparsecs (19,000 light-years) away from Earth in the Scutum–Centaurus Arm of the Milky Way galaxy, and is assumed to be one of a group of stars at a similar distance, although some studies consider it to be an unrelated or foreground red supergiant. It is potentially among the largest known stars, one of the most luminous red supergiants, and one of the most luminous stars in the Milky Way.
Stephenson 2 DFK 1 together with its supposed parent cluster Stephenson 2 (upper left), viewed by the Two-Micron All Sky Survey. Credit: Université de Strasbourg/CNRS (2003) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scutum |
| Right ascension | 18h 39m 02.3709s |
| Declination | −06° 05′ 10.5357″ |
| Characteristics | |
| Evolutionary stage | Red supergiant, possible extreme red hypergiant |
| Spectral type | ~M6 |
| Apparent magnitude (G) | 15.2631±0.0092 |
| Apparent magnitude (J) | 7.150 |
| Apparent magnitude (H) | 4.698 |
| Apparent magnitude (K) | 2.9 |
| Astrometry | |
| Radial velocity (Rv) | 89 km/s |
| Proper motion (μ) | RA: −3.045±0.511 mas/yr Dec.: −5.950±0.480 mas/yr |
| Parallax (π) | −0.0081 ± 0.3120 mas |
| Distance | 18,900 (disputed) ly (5,800 pc) |
| Other designations | |
| Database references | |
| SIMBAD | data |
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