Astronomy:25 Scorpii
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Short description: Star in the constellation Scorpius
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 46m 51.34498s[1] |
| Declination | −25° 31′ 42.8647″[1] |
| Apparent magnitude (V) | 6.71[2] |
| Characteristics | |
| Spectral type | K0 II[3] |
| B−V color index | +1.18[2] |
| Astrometry | |
| Radial velocity (Rv) | −1.31±0.14[1] km/s |
| Proper motion (μ) | RA: −4.165[1] mas/yr Dec.: −15.630[1] mas/yr |
| Parallax (π) | 3.5599 ± 0.0433[1] mas |
| Distance | 920 ± 10 ly (281 ± 3 pc) |
| Absolute magnitude (MV) | 0.09[4] |
| Details | |
| Mass | 2.075+0.709 −0.993[5] M☉ |
| Radius | 12.719+2.800 −1.943[5] R☉ |
| Luminosity | 135[6] L☉ |
| Surface gravity (log g) | 2.509+0.135 −0.351[5] cgs |
| Temperature | 4777+76 −133[5] K |
| Metallicity [Fe/H] | −0.031+0.150 −0.480[5] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
25 Scorpii (abbreviated to 25 Sco) is a star in the zodiac constellation of Scorpius, located about 920 light years away from the Sun. Its apparent magnitude is 6.71,[2] so its apparent brightness is at the limit of human eyesight and can only be seen under excellent conditions, according to the Bortle scale. The object is moving closer to the Earth with a heliocentric radial velocity of −1.3 km/s.[1] It is a proposed member of the Scorpius–Centaurus association.[7]
This is an evolved bright giant with a spectral type of K0 II.[3] It is about two times more massive and over twelve times wider than the Sun.[5] The star is radiating 135[6] times the Sun's luminosity from its photosphere at an effective temperature of about 4,700 K.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Corben, P. M. (1971). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astron. Soc. Southern Africa 70: 37. Bibcode: 1971MNSSA..30...37C.
- ↑ 3.0 3.1 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey 5: 0. Bibcode: 1999MSS...C05....0H.
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 Huber, Daniel; Bryson, Stephen T.; Haas, Michael R.; Barclay, Thomas; Barentsen, Geert; Howell, Steve B.; Sharma, Sanjib; Stello, Dennis et al. (2016). "The K2 Ecliptic Plane Input Catalog (EPIC) and Stellar Classifications of 138,600 Targets in Campaigns 1-8". The Astrophysical Journal Supplement Series 224 (1): 2. doi:10.3847/0067-0049/224/1/2. Bibcode: 2016ApJS..224....2H.
- ↑ 6.0 6.1 Sartori, M. J.; Lépine, J. R. D.; Dias, W. S. (2003). "Formation scenarios for the young stellar associations between galactic longitudes l = 280°–360°". Astronomy & Astrophysics 404 (3): 913–926. doi:10.1051/0004-6361:20030581. Bibcode: 2003A&A...404..913S.
- ↑ Murphy, Simon J. et al. (November 2015). "New members of the TW Hydrae Association and two accreting M-dwarfs in Scorpius–Centaurus". Monthly Notices of the Royal Astronomical Society 453 (3): 2220–2231. doi:10.1093/mnras/stv1745. Bibcode: 2015MNRAS.453.2220M.
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