| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16 30 12.47514 |
| Declination | −25° 06′ 54.8043″ |
| Apparent magnitude (V) | 4.78 |
| Characteristics | |
| Spectral type | B3 V |
| Astrometry | |
| Proper motion (μ) | RA: −4.45 mas/yr Dec.: −26.33 mas/yr |
| Parallax (π) | 7.89 ± 0.24 mas |
| Distance | 410 ± 10 ly (127 ± 4 pc) |
| Absolute magnitude (MV) | −0.72 |
| Details | |
| Mass | 6.1±0.1 M☉ |
| Luminosity | 334.57 L☉ |
| Temperature | 19,600 K |
| Rotational velocity (v sin i) | 169±4 km/s |
| Age | 10.5±2.1 Myr |
| Other designations | |
| i Sco, 22 Sco, CD−24°12695, HD 148605, HIP 80815, HR 6141, SAO 184429 | |
| Database references | |
| SIMBAD | data |
22 Scorpii (i Scorpii) is a single 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. 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. 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.
22 Scorpii is a B-type main-sequence star with a stellar classification of B3 V. It is ten million years old and has a high rate of spin with a projected rotational velocity of 169 km/s. The star has about six times the mass of the Sun and is radiating 335 times the Sun's luminosity from its photosphere at an effective temperature of 19,600 K.
References
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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
- "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.
