Astronomy:Iota2 Scorpii

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Short description: Star in the constellation Scorpius
For other stars with this Bayer designation, see ι Scorpii
ι2 Scorpii
Observation data
Equinox J2000.0]] (ICRS)
Constellation Scorpius
Right ascension  17h 50m 11.11291s[1]
Declination −40° 05′ 25.5629″[1]
Apparent magnitude (V) +4.82[2]
Characteristics
Spectral type A2 Ib[3] or A6 Ib[4]
U−B color index +0.19[2]
B−V color index +0.25[2]
Astrometry
Radial velocity (Rv)−10.2[5] km/s
Proper motion (μ) RA: +3.90[1] mas/yr
Dec.: −2.42[1] mas/yr
Parallax (π)1.28 ± 0.24[1] mas
Distanceapprox. 2,500 ly
(approx. 800 pc)
Absolute magnitude (MV)−4.59[6]
Details
Mass8.8±0.2[4] M☉
Radius78[7] R☉
Luminosity5,798[8] L☉
Surface gravity (log g)1.68[9] cgs
Temperature8,246[7] K
Metallicity [Fe/H]−0.33[9] dex
Age29.8±4.3[4] Myr
Other designations
ι2 Sco, CD−40°11886, HD 161912, HIP 87294, HR 6631, SAO 228466[10]
Database references
SIMBADdata

ι2 Scorpii, Latinised as Iota2 Scorpii, is a single[11] star in tail of the zodiac constellation of Scorpius. It has an apparent visual magnitude of +4.82,[2] and is visible to the naked eye. Because of parallax measurement errors, the distance to this star is only approximately known: it lies around 2,500 light years away from the Sun. It has a visual companion, a magnitude 11.0 star at an angular separation of 31.60 arcseconds along a position angle of 36°, as of 2000.[12]

In the literature, there are two different stellar classifications for this star: A2 Ib[3] and A6 Ib.[4] In either case it is an A-type supergiant star with an estimated age of 30[4] million years and a mass 8.8 times that of the Sun.[4] It shines with a luminosity 5,798 times the Sun's from an outer atmosphere that has an effective temperature of 8,246 K.[7] As with other stars of its type, ι2 Scorpii varies slightly in brightness, showing an amplitude of 0.05 in magnitude.[13]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (November 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. ↑ 2.0 2.1 2.2 2.3 Dachs, J. et al. (November 1982), "UBV-Hβ photometry of luminous stars between l equals 335 deg and l equals 6 deg", Astronomy and Astrophysics Supplement Series 50: 261–275, Bibcode: 1982A&AS...50..261D. 
  3. ↑ 3.0 3.1 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Tetzlaff, N. et al. (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. 
  5. ↑ Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick, eds., "The Revision of the General Catalogue of Radial Velocities", Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 (University of Toronto: International Astronomical Union) 30: p. 57, Bibcode: 1967IAUS...30...57E. 
  6. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 7.2 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  8. ↑ McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M. 
  9. ↑ 9.0 9.1 Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A. et al. (2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. Bibcode: 2019A&A...628A..94A. 
  10. ↑ "iot02 Sco". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=iot02+Sco. 
  11. ↑ Eggleton, P. P.; Tokovinin, A. A. (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. 
  12. ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M. 
  13. ↑ Adelman, S. J.; Albayrak, B. (December 1997), "On the Variability of Early A-Type Supergiants", Information Bulletin on Variable Stars 4541: 1, Bibcode: 1997IBVS.4541....1A. 



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