22 Scorpii

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22 Scorpii
Observation data
Epoch J2000       Equinox J2000
Constellation Scorpius [1]
Right ascension 16h 30m 12.47527s [2]
Declination −25° 06′ 54.7966″ [2]
Apparent magnitude  (V)4.78 [3]
Characteristics
Evolutionary stage main sequence [2]
Spectral type B3 V [4]
Astrometry
Proper motion (μ)RA: −4.192 [2] mas/yr
Dec.: −26.975 [2] mas/yr
Parallax (π)7.9402±0.1848  mas [2]
Distance 411 ± 10  ly
(126 ± 3  pc)
Absolute magnitude  (MV)−0.72 [1]
Details
Mass 4.4 [5]   M☉
Radius 3.4 [2]   R☉
Luminosity 601 [5]   L☉
Surface gravity (log g)4.5 [6]   cgs
Temperature 16,683 [5]   K
Metallicity [Fe/H]0.66 [2]   dex
Rotational velocity (v sin i)169±4 [3]  km/s
Age 8 [6]   Myr
Other designations
i Sco, 22 Sco, CD−24°12695, HD 148605, HIP 80815, HR 6141, SAO 184429 [7]
Database references
SIMBAD data

22 Scorpii (i Scorpii) is a single [8] 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. [3] The distance to this star is estimated to be around 411 light years, as derived from its annual parallax shift of 7.9±0.2  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. [9]

22 Scorpii in the IC 4605 reflection nebula, one of a collection of diffuse and dark nebulae in the Rho Ophiuchi cloud complex IC 4605 reflection nebula in 32 inch Schulman telescope.jpg
22 Scorpii in the IC 4605 reflection nebula, one of a collection of diffuse and dark nebulae in the Rho Ophiuchi cloud complex

22 Scorpii is a B-type main-sequence star with a stellar classification of B3 V. [4] It is ten million years old [10] and has a high rate of spin with a projected rotational velocity of 169 km/s. [3] The star has about 4.4 times the mass of the Sun and is radiating 601 times the Sun's luminosity from its photosphere at an effective temperature of 16,683  K . [3]

References

  1. 1 2 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 .
  2. 1 2 3 4 5 6 7 8 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 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, arXiv: 1208.1674 , Bibcode:2012AJ....144..130B, doi:10.1088/0004-6256/144/5/130, S2CID   118868235, 130.
  4. 1 2 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 .
  5. 1 2 3 Fouesneau, M.; Andrae, R.; Dharmawardena, T.; Rybizki, J.; Bailer-Jones, C. A. L.; Demleitner, M. (2022), "Astrophysical parameters from Gaia DR2, 2MASS, and AllWISE", Astronomy and Astrophysics, 662: A125, arXiv: 2201.03252 , Bibcode:2022A&A...662A.125F, doi:10.1051/0004-6361/202141828
  6. 1 2 Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 40, arXiv: 1604.06456 , Bibcode:2016AJ....152...40G, doi: 10.3847/0004-6256/152/2/40
  7. ↑ "22 Sco". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018-03-16.
  8. ↑ 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 .
  9. ↑ 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.
  10. ↑ 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 .
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