25 Scorpii

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]

25 Scorpii
Observation data
Epoch J2000      Equinox J2000
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 mas[1]
Distance920 ± 10 ly
(281 ± 3 pc)
Absolute magnitude (MV)0.09[4]
Details
Mass2.075+0.709
−0.993[5] M☉
Radius12.719+2.800
−1.943[5] R☉
Luminosity135[6] L☉
Surface gravity (log g)2.509+0.135
−0.351[5] cgs
Temperature4777+76
−133[5] K
Metallicity [Fe/H]−0.031+0.150
−0.480[5] dex
Other designations
25 Sco, CD−25° 11667, FK5 5482, HD 151179, HIP 82140, HR 6225, SAO 184630
Database references
SIMBADdata

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. 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. 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. 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.
  4. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  5. Huber, Daniel; Bryson, Stephen T.; Haas, Michael R.; Barclay, Thomas; Barentsen, Geert; Howell, Steve B.; Sharma, Sanjib; Stello, Dennis; Thompson, Susan E. (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. arXiv:1512.02643. Bibcode:2016ApJS..224....2H. doi:10.3847/0067-0049/224/1/2. S2CID 118621218.
  6. Sartori, M. J.; Lépine, J. R. D.; Dias, W. S. (2003). "Formation scenarios for the young stellar associations between galactic longitudes l $\mathsf{= 280\degr{-}360\degr}$". Astronomy & Astrophysics. 404 (3): 913–926. arXiv:astro-ph/0304426. Bibcode:2003A&A...404..913S. doi:10.1051/0004-6361:20030581. S2CID 17411999.
  7. 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. arXiv:1507.08002. Bibcode:2015MNRAS.453.2220M. doi:10.1093/mnras/stv1745.
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