Astronomy:Iota1 Scorpii

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Short description: Star in the constellation Scorpius
For other stars with this Bayer designation, see ι Scorpii
ι1 Scorpii
Location of ι1 Scorpii (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Scorpius
Right ascension  17h 47m 35.08113s[1]
Declination −40° 07′ 37.1893″[1]
Apparent magnitude (V) 3.03[2]
Characteristics
Spectral type F2 Ia[3]
U−B color index +0.26[2]
B−V color index +0.51[2]
Astrometry
Radial velocity (Rv)−26.00[4] km/s
Proper motion (μ) RA: +0.01[1] mas/yr
Dec.: −6.24[1] mas/yr
Parallax (π)1.69 ± 0.15[1] mas
Distance1,900 ± 200 ly
(590 ± 50 pc)
Absolute magnitude (MV)−6.51±0.19[5]
Details
Mass12.11±0.66[6] M☉
Radius120.3[7] R☉
Luminosity35,070[6] L☉
Surface gravity (log g)0.5 to 1.0[8] cgs
Temperature6,910 or 7,103[8] K
Metallicity [Fe/H]−0.13 to −0.11[8] dex
Age17.0 ± 0.5[9] Myr
Other designations
ι1 Sco, CD−40°11838, FK5 666, HD 161471, HIP 87073, HR 6615, SAO 228420
Database references
SIMBADdata

Iota1 Scorpii, Latinized from ι1 Scorpii, is a star in the southern constellation of Scorpius. With an apparent visual magnitude of 3.03,[2] this star can be seen with the naked eye. It is sometimes called by the proper name Apollyon.[10] Parallax measurements place it at a distance of roughly 1,930 light-years (590 parsecs) from Earth, with a 9% margin of error.[1] At the estimated distance, the apparent magnitude is diminished by 0.66 magnitudes due to intervening gas and dust between Earth and the star.[5]

This star has a stellar classification of F2 Ia,[3] with the 'Ia' luminosity class indicating this is a supergiant more luminous than typical supergiants. It has about 12 times the Sun's mass[11] and is 35,000 times more luminous.[6] The limb-darkened angular diameter of Iota1 Scorpii is estimated at 1.896±0.213 mas.[12] At the estimated distance, this corresponds to a physical radius of 120.3 R☉.[7] The effective temperature of the photosphere is 6,910 or 7,103 K,[8] which gives it a yellow-white hue typical of an F-type star.[13]

Iota1 Scorpii has a 10th magnitude companion at an angular separation of 37.5 arcseconds, which, at the distance of this star, gives it a projected separation of 20,000 astronomical units (AU). As the relative separation of the two stars along the line of sight to the Earth is not known, however, this distance represents only a minimum value for their separation.[14]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J 
  3. ↑ 3.0 3.1 Houk, Nancy (1978), "Michigan catalogue of two-dimensional spectral types for the HD stars", Ann Arbor: Dept. Of Astronomy (Ann Arbor: Dept. of Astronomy, University of Michigan) 2, Bibcode: 1978mcts.book.....H 
  4. ↑ De Bruijne, J. H. J.; Eilers, A.-C. (2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: A61, doi:10.1051/0004-6361/201219219, Bibcode: 2012A&A...546A..61D 
  5. ↑ 5.0 5.1 Neuhäuser, R.; Torres, G.; Mugrauer, M.; Neuhäuser, D. L.; Chapman, J.; Luge, D.; Cosci, M. (2022), "Colour evolution of Betelgeuse and Antares over two millennia, derived from historical records, as a new constraint on mass and age", Monthly Notices of the Royal Astronomical Society 516 (1): 693, doi:10.1093/mnras/stac1969, Bibcode: 2022MNRAS.516..693N 
  6. ↑ 6.0 6.1 6.2 Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (2010-04-01), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten 331 (4): 349, doi:10.1002/asna.200911355, ISSN 0004-6337, Bibcode: 2010AN....331..349H 
  7. ↑ 7.0 7.1 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3 ed.), Birkhäuser, ISBN 978-3-540-29692-8, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 . The radius (R*) is given by:
    2⋅R*=(590⋅1.896⋅10−3) AU0.0046491 AU/R⨀≈240.61⋅R⨀
  8. ↑ 8.0 8.1 8.2 8.3 Luck, R. Earle (2014), "Parameters and Abundances in Luminous Stars", The Astronomical Journal 147 (6): 137, doi:10.1088/0004-6256/147/6/137, Bibcode: 2014AJ....147..137L 
  9. ↑ 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, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T 
  10. ↑ Moore, Patrick (2010), The Sky at Night, Patrick Moore's Practical Astronomy, Springer, p. 97, ISBN 978-1-4419-6408-3, https://books.google.com/books?id=7u7k3qBd-boC&pg=PA97 
  11. ↑ Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten 331 (4): 349, doi:10.1002/asna.200911355, Bibcode: 2010AN....331..349H 
  12. ↑ Cruzalèbes, P.; Petrov, R. G.; Robbe-Dubois, S.; Varga, J.; Burtscher, L.; Allouche, F.; Berio, P.; Hofmann, K. -H. et al. (2019-12-01), "A catalogue of stellar diameters and fluxes for mid-infrared interferometry", Monthly Notices of the Royal Astronomical Society 490 (3): 3158–3176, doi:10.1093/mnras/stz2803, ISSN 0035-8711, Bibcode: 2019MNRAS.490.3158C 
  13. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, retrieved 2012-01-16 
  14. ↑ Kaler, James B., "Iota-1 Scorpii", Stars (University of Illinois), http://stars.astro.illinois.edu/sow/iota1sco.html, retrieved 2012-01-12 



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