SW Cephei
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 21h 25m 45.903s[1] |
| Declination | +62° 34′ 26.407″[1] |
| Apparent magnitude (V) | 8.04 - 8.88[2] |
| Characteristics | |
| Evolutionary stage | Red supergiant |
| Spectral type | M3.5Ia-Iab[2][3] |
| Apparent magnitude (K) | 1.75 |
| Apparent magnitude (U) | 15.40 |
| Apparent magnitude (B) | 13.16 |
| Apparent magnitude (G) | 6.5695 |
| Apparent magnitude (J) | 3.14 |
| Apparent magnitude (H) | 2.13 |
| Apparent magnitude (V) | 10.80 |
| Astrometry | |
| Radial velocity (Rv) | 70.110±0.590[1] km/s |
| Proper motion (μ) | RA: −7.060±0.096[1] mas/yr Dec.: −1.609±0.108[1] mas/yr |
| Parallax (π) | 0.25 ± 0.06[1] mas |
| Distance | approx. 13,000 ly (approx. 4,000 pc) |
| Details | |
| Mass | 9[4] M☉ |
| Radius | 234[4] - 1,131[3] R☉ |
| Luminosity | 8,395[4] - 185,000[3] L☉ |
| Surface gravity (log g) | 0.65[4] cgs |
| Temperature | 3,550[3] - 3,570[4] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
SW Cephei is a possible red supergiant star in the constellation of Cepheus. It is one of the largest stars known with a radius of 1,131 R☉[3]
References[edit]
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ↑ 2.0 2.1 "GCVS Query=SW Cep". Sternberg Astronomical Institute. General Catalogue of Variable Stars @ Sternberg Astronomical Institute, Moscow, Russia. Retrieved 2020-06-26.
- ↑ 3.0 3.1 3.2 3.3 3.4 Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal. 158 (1): 20. arXiv:1905.03744. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd.
- ↑ 4.0 4.1 4.2 4.3 4.4 Josselin, E.; Plez, B. (2007). "Atmospheric dynamics and the mass loss process in red supergiant stars". Astronomy and Astrophysics. 469 (2): 671. arXiv:0705.0266. Bibcode:2007A&A...469..671J. doi:10.1051/0004-6361:20066353.
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