Stephenson 2 DFK 1
Star in the open cluster Stephenson 2 / From Wikipedia, the free encyclopedia
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This article is about Stephenson 2-18. Not to be confused with RSGC2-18, also known as Stephenson 2 DFK 18.
Stephenson 2 DFK 1, also known as RSGC2-01[lower-alpha 2] or St2-18, is a red supergiant (RSG) or possible extreme red hypergiant[2] (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.[5][6]
Quick Facts Constellation, Right ascension ...
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[1] |
Declination | −06° 05′ 10.5357″[1] |
Characteristics | |
Evolutionary stage | Red supergiant, possible extreme red hypergiant[2] |
Spectral type | ~M6[3] |
Apparent magnitude (G) | 15.2631±0.0092[1] |
Apparent magnitude (J) | 7.150[4] |
Apparent magnitude (H) | 4.698[4] |
Apparent magnitude (K) | 2.9[4] |
Astrometry | |
Radial velocity (Rv) | 89[5] km/s |
Proper motion (μ) | RA: −3.045±0.511[1] mas/yr Dec.: −5.950±0.480[1] mas/yr |
Distance | 18,900[6] (disputed) ly (5,800[6] pc) |
Other designations | |
Stephenson 2-18,[lower-alpha 1] Stephenson 2 DFK 1, St2-18, 2MASS J18390238-0605106, IRAS 18363-0607, DENIS J183902.4-060510, MSX6C G026.1044-00.0283 | |
Database references | |
SIMBAD | data |
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