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]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 mas[1] |
| 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 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 edit
- ^ a b c d e f van Leeuwen, F. (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, S2CID 18759600.
- ^ a b c d e f 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, arXiv:1208.1674, Bibcode:2012AJ....144..130B, doi:10.1088/0004-6256/144/5/130, S2CID 118868235, 130.
- ^ a b Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
- ^ a b c 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.
- ^ a b c d 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, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
- ^ "22 Sco". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-16.
- ^ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ 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, arXiv:0709.3492, Bibcode:2008ApJ...672.1013P, doi:10.1086/523883, S2CID 12396730, 1013–1037.
External links edit
- "22 Scorpii - Wolfram Alpha". Wolfram Alpha.
- "22 Scorpii (HIP 80815)". Ashland Astronomy Studio. Archived from the original on 2013-04-14. Retrieved 2012-08-19.