Iota2 Scorpii

ι² Scorpii
Observation data; Epoch J2000 Equinox J2000
Constellation	Scorpius
Right ascension	17h 50m 11.11291s
Declination	−40° 05′ 25.5629″
Apparent magnitude (V)	+4.82
Characteristics
Spectral type	A2 Ib or A6 Ib
U−B color index	+0.19
B−V color index	+0.25
Astrometry
Radial velocity (Rv)	−10.2 km/s
Proper motion (μ)	RA: +3.90 mas/yr ; Dec.: −2.42 mas/yr
Parallax (π)	1.28±0.24 mas
Distance	approx. 2,500 ly ; (approx. 800 pc)
Absolute magnitude (MV)	−4.59
Details
Mass	8.8±0.2 M☉
Radius	78 R☉
Luminosity	5,798 L☉
Surface gravity (log g)	1.68 cgs
Temperature	8,246 K
Metallicity [Fe/H]	−0.33 dex
Age	29.8±4.3 Myr
Other designations
	ι2 Sco, CD−40°11886, HD 161912, HIP 87294, HR 6631, SAO 228466
Database references
SIMBAD	data

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

^ ^a ^b ^c ^d ^e van Leeuwen, F. (November 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 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.
^ ^a ^b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
^ ^a ^b ^c ^d ^e ^f 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, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
^ 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, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E.
^ 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 Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
^ McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
^ ^a ^b Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; De Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765.
^ "iot02 Sco". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-09-20.
^ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
^ 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.

External links

Kaler, James B., "Iota-2 Scorpii", Stars, University of Illinois, retrieved 2016-09-20.

[vanLeeuwen2007-1] van Leeuwen, F. (November 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.

[Dachs1982-2] 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.

[houk1978-3] Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.

[Tetzlaff2011-4] ^ ^a ^b ^c ^d ^e ^f 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, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.

[rgcrv-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, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E.

[Anderson2012-6] 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.

[tic-7] Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.

[Mcdonald2012-8] McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.

[starhorse-9] Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; De Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765.

[SIMBAD-10] "iot02 Sco". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-09-20.

[Eggleton2008-11] 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.

[WDSC2014-12] Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.

[Adelman1997-13] 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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Iota2 Scorpii

References

External links

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