Astronomy:22 Scorpii
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 30m 12.47514s[1] |
| Declination | −25° 06′ 54.8043″[1] |
| Apparent magnitude (V) | 4.78[2] |
| Characteristics | |
| Spectral type | B3 V[3] |
| Astrometry | |
| Proper motion (μ) | RA: −4.45[1] mas/yr Dec.: −26.33[1] mas/yr |
| Parallax (π) | 7.89 ± 0.24[1] mas |
| Distance | 410 ± 10 ly (127 ± 4 pc) |
| Absolute magnitude (MV) | −0.72[4] |
| Details | |
| Mass | 6.1±0.1[5] M☉ |
| Luminosity | 334.57[4] L☉ |
| Temperature | 19,600[2] K |
| Rotational velocity (v sin i) | 169±4[2] km/s |
| Age | 10.5±2.1[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
22 Scorpii (i Scorpii) is a single[7] star in the southern zodiac constellation of Scorpius, about one degree from Antares. It is faintly visible to the naked eye with an apparent visual magnitude of 4.78.[2] The distance to this star is estimated to be around 410 light years, as derived from its annual parallax shift of 7.89±0.24 mas.[1] The star is embedded in, or adjacent to, the diffuse nebulous cloud IC 4605 located in the western regions of the Rho Ophiuchi cloud complex.[8]
22 Scorpii is a B-type main-sequence star with a stellar classification of B3 V.[3] It is ten[5] million years old and has a high rate of spin with a projected rotational velocity of 169 km/s.[2] The star has about six[5] times the mass of the Sun and is radiating 335[4] times the Sun's luminosity from its photosphere at an effective temperature of 19,600 K.[2]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Bragança, G. A. et al. (November 2012), "Projected Rotational Velocities and Stellar Characterization of 350 B Stars in the Nearby Galactic Disk", The Astronomical Journal 144 (5): 10, doi:10.1088/0004-6256/144/5/130, 130, Bibcode: 2012AJ....144..130B.
- ↑ 3.0 3.1 Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1988mcts.book.....H.
- ↑ 4.0 4.1 4.2 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 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T.
- ↑ "22 Sco". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=22+Sco.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Padgett, Deborah L. et al. (January 2008), "The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds. VII. Ophiuchus Observed with MIPS", The Astrophysical Journal 672 (2): 1013–1037, doi:10.1086/523883, 1013–1037, Bibcode: 2008ApJ...672.1013P.
External links
- "22 Scorpii - Wolfram Alpha". Wolfram Alpha. http://www.wolframalpha.com/input/?i=22+Scorpii.
- "22 Scorpii (HIP 80815)". Ashland Astronomy Studio. http://www.astrostudio.org/xhip.php?hip=80815.
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