Back Stephenson 2-18 Afrikaans ستيفنسون 2-18 Arabic Stephenson 2 DFK 1 Azerbaijani স্টিফেনসন ২-১৮ Bengali/Bangla Stephenson 2-18 Catalan Stephenson 2-18 Czech Stephenson 2-18 German Stephenson 2-18 Spanish استفنسون ۱۸-۲ Persian Stephenson 2-18 French
 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 | |
| Database references | |
| SIMBAD | data |
Stephenson 2 DFK 1, also known as RSGC2-01[a] 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]
- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b Cite error: The named reference
Davies2007was invoked but never defined (see the help page). - ^ Negueruela, I.; González-Fernández, C.; Dorda, R.; Marco, A.; Clark, J. S. (2013). "The population of M-type supergiants in the starburst cluster Stephenson 2". Eas Publications Series. 60: 279. arXiv:1303.1837. Bibcode:2013EAS....60..279N. doi:10.1051/eas/1360032. S2CID 119232033.
- ^ a b c 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 Cite error: The named reference
verheyen2012was invoked but never defined (see the help page). - ^ a b c Humphreys, Roberta M.; Helmel, Greta; Jones, Terry J.; Gordon, Michael S. (2020). "Exploring the Mass Loss Histories of the Red Supergiants". The Astronomical Journal. 160 (3): 145. arXiv:2008.01108. Bibcode:2020AJ....160..145H. doi:10.3847/1538-3881/abab15. S2CID 220961677.
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