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 |
Distance | approx. 710 ly (approx. 220 pc) |
Details | |
Mass | +0.709 −0.993 2.075[5] M☉ |
Radius | +2.800 −1.943 12.719[5] R☉ |
Luminosity | 135[6] L☉ |
Surface gravity (log g) | +0.135 −0.351 2.509[5] cgs |
Temperature | +76 −133 4777[5] K |
Metallicity [Fe/H] | +0.150 −0.480 −0.031[5] dex |
Other designations | |
Database references | |
SIMBAD | data |
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 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.
- 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.
- 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.
- ↑ 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.
- 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.
- ↑ 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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