25 Scorpii

25 Scorpii
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension 16h 46m 51.34430s[1]
Declination −25° 31′ 42.8552″[1]
Apparent magnitude (V) 6.71[2]
Characteristics
Spectral type K0II[3]
B−V color index +1.18[2]
Astrometry
Radial velocity (Rv)2.0 ± 4.4[4] km/s
Proper motion (μ) RA: -4.34[1] mas/yr
Dec.: -14.28[1] mas/yr
Parallax (π)4.62 ± 0.63[1] mas
Distanceapprox. 710 ly
(approx. 220 pc)
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
CD−25° 11667, FK5 5482, HD 151179, HIP 82140, HR 6225, SAO 184630
Database references
SIMBADdata

25 Scorpii (abbreviated to 25 Sco) is a star in the zodiac constellation of Scorpius. 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. Based on parallax estimates made by the Hipparcos spacecraft, the star is located about 710 light-years (220 parsecs) away.[1]

25 Scorpii is an evolved bright giant, with a spectral type of K0II.[3] It is about two times more massive than the Sun, and over twelve times wider than the Sun.[5] Its effective temperature is about 4700 K.[5]

References

  1. 1 2 3 4 5 6 van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. 1 2 3 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. 1 2 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. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  5. 1 2 3 4 5 6 7 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.
  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. arXiv:astro-ph/0304426. Bibcode:2003A&A...404..913S. doi:10.1051/0004-6361:20030581.


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