Back KW الرامي Arabic KW Sagittarii AST KW Sagitarii Czech KW Sagittarii German KW Sagittarii Spanish کیدابلیو کمان Persian KW Sagittarii French KW בקשת HE KW Sagittarii Hungarian KW Sagittarii ID
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 17h 52m 00.72695s[1] |
| Declination | −28° 01′ 20.5557″[1] |
| Apparent magnitude (V) | 11.0[2] |
| Characteristics | |
| Spectral type | M1.5Iab[3] (M0I - M4Ia[4]) |
| Apparent magnitude (K) | 1.43[2] |
| U−B color index | 3.21[3] |
| B−V color index | 2.47[3] |
| V−R color index | 2.58[3] |
| J−K color index | 1.56[3] |
| Variable type | SRc[4] |
| Astrometry | |
| Radial velocity (Rv) | −7.40[5] km/s |
| Proper motion (μ) | RA: +0.843 mas/yr[1] Dec.: −0.946 mas/yr[1] |
| Parallax (π) | 0.4355 ± 0.0726 mas[1] |
| Distance | 7,890 ly (2,420 pc)[6][a] |
| Absolute magnitude (MV) | −7.7[7] |
| Details | |
| Mass | 20 (or 20–40[b])[3] M☉ |
| Radius | 1,009±142[3] R☉ |
| Luminosity (bolometric) | 175,000±52,000[3] L☉ |
| Surface gravity (log g) | 0.0[3] cgs |
| Temperature | 3,720±183[3] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
KW Sagittarii is a red supergiant star, located approximately 2,420 parsecs (7,900 light-years) away from the Sun in the direction of the constellation Sagittarius. It is one of the largest known stars, with a diameter about 1,000 times larger than the Sun. If placed at the center of the Solar System, the star's surface would engulf Mars, coming close to Jupiter's orbit.
- ^ a b c d Cite error: The named reference
DR3was invoked but never defined (see the help page). - ^ a b Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
- ^ a b c d e f g h i j Arroyo-Torres, B.; Wittkowski, M.; Marcaide, J. M.; Hauschildt, P. H. (2013). "The atmospheric structure and fundamental parameters of the red supergiants AH Scorpii, UY Scuti, and KW Sagittarii". Astronomy & Astrophysics. 554: A76. arXiv:1305.6179. Bibcode:2013A&A...554A..76A. doi:10.1051/0004-6361/201220920. S2CID 73575062.
- ^ a b KW Sgr, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars Archived 2017-06-20 at the Wayback Machine, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 10, 2010. (Quick look: KW+Sgr)
- ^ Barbier-Brossat, M.; Petit, M.; Figon, P. (1994). "Third bibliographic catalogue of stellar radial velocities (Text in French)". Astronomy and Astrophysics Supplement Series. 108: 603. Bibcode:1994A&AS..108..603B.
- ^ Cite error: The named reference
melnikwas invoked but never defined (see the help page). - ^ Massey, Philip; Silva, David R.; Levesque, Emily M.; Plez, Bertrand; Olsen, Knut A. G.; Clayton, Geoffrey C.; Meynet, Georges; Maeder, Andre (2009). "Red Supergiants in the Andromeda Galaxy (M31)". The Astrophysical Journal. 703 (1): 420. arXiv:0907.3767. Bibcode:2009ApJ...703..420M. doi:10.1088/0004-637X/703/1/420. S2CID 119293010.
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