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Star in the constellation Carina
ι Carinae
Location of ι Carinae (circled in red)
Observation dataEpoch J2000 Equinox J2000
Constellation
Carina
Right ascension
09 h 17 m 05.40686s [1]
Declination
−59° 16 ′ 30.8353″[1]
Apparent magnitude (V )
2.21[2]
Characteristics
Spectral type
A9 Ib [3]
U−B color index
+0.16[4]
B−V color index
+0.18[4]
Variable type
Suspected[5]
Astrometry Radial velocity (R v )13.3[2] km/s Proper motion (μ) RA: −19.03[1] mas /yr Dec.: +13.11[1] mas /yr Parallax (π)4.71 ± 0.46 mas [1] Distance 690 ± 70 ly (210 ± 20 pc ) Absolute magnitude (M V )−5.1[6]
Details Mass 7.4[7] M ☉ Radius 43 [8] R ☉ Luminosity 4,900[7] L ☉ Surface gravity (log g )2.40[7] cgs Temperature 7,500[7] K Metallicity [Fe/H]−0.14[7] dex Rotational velocity (v sin i )10.0[7] km/s Age 37.4 ± 5.1 [9] Myr
Other designations
iota Car, HR 3699, HD 80404, SAO 236808, FK5 351, CD −58°2529, CPD −58°1465, NSV 04444, HIP 45556.[10]
Database references SIMBAD data
Iota Carinae (ι Carinae , abbreviated Iota Car , ι Car ), officially named Aspidiske ,[11] is a star in the southern constellation of Carina . With an apparent visual magnitude of 2.2,[2] it is one of the brighter stars in the night sky.
Appearance and location [ edit ]
The star and rest of southern Carina never sets on places from about 34° S southwards including Cape Town ; its northernmost viewpoints are unobstructed southern horizons near to the 30th parallel north , once a day.[12]
The False Cross is an asterism formed from Iota Carinae, Delta Velorum , Kappa Velorum and Epsilon Carinae . It is so called because it is sometimes mistaken for the Southern Cross , causing errors in astronavigation .[13]
The star appears 46.0' (0.7668°) WSW of lowercase a Carinae , a mid-third-magnitude star, also forming part of the asterism and leading to its long, narrow projection which culminates in Canopus .[14]
Nomenclature [ edit ]
ι Carinae (Latinised to Iota Carinae ) is the star's Bayer designation .
It has the traditional cognate names Aspidiske (not be confused with Asmidiske , the proper name of Xi Puppis ), Scutulum and Turais (or Tureis , a name shared with Rho Puppis ). Turais is the Arabic تُرَيْس turais "small shield" (diminutive ), while Aspidiske and Scutulum are Greek and Latin translations from ασπίδα and scūtum .[12] In 2016, the International Astronomical Union formed its Working Group on Star Names (WGSN)[15] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[16] included a table of the first two batches of names it approved which included Aspidiske for this star.
In Chinese , 海石 (Hǎi Shí ), meaning Sea Rock , refers to an asterism consisting of Iota Carinae, Epsilon Carinae , HD 83183 , HD 84810 and Upsilon Carinae .[17] Consequently, Iota Carinae itself is known as 海石二 (Hǎi Shí èr , English: the Second Star of Sea Rock ).[18]
Properties [ edit ]
Based on parallax measurements this star is about 690 light-years (210 parsecs ) from the Earth . It has a stellar classification of A9 Ib,[3] with the luminosity class of 'Ib' indicating it has reached the stage of its evolution where it has expanded to become a lower-luminosity supergiant . It is just entering the Hertzsprung gap of the Hertzsprung–Russell diagram , and is evolving towards a red supergiant phase.[19]
Iota Carinae has more than seven times the Sun's mass [7] and has expanded to roughly 43 times the Sun's radius .[8] It is radiating about 4,900 times the luminosity of the Sun .[7] However, this luminosity appears to vary , causing the star's apparent magnitude to range between 2.23–2.28.[5] This energy is being radiated into space from the star's outer envelope at an effective temperature of 7,500 K,[7] giving Iota Carinae the white hue typical of an A-type star .[20]
Due to precession of the Earth's axis of rotation , in the next 7,500 years the south celestial pole will pass close to this star and Upsilon Carinae and it will become the South Star around 8100 CE.[21]
References [ edit ]
^ a b c Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veröff. Astron. Rechen-Inst. Heidelb , 35 (35 ), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode :1999VeARI..35....1W
^ a b Houk, Nancy (1978), "Michigan catalogue of two-dimensional spectral types for the HD stars", University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90_ to −53_ƒ0 , 1 , Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode :1975mcts.book.....H
^ a b 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 .
^ a b Ruban, E. V.; et al. (September 2006), "Spectrophotometric observations of variable stars", Astronomy Letters , 32 (9 ): 604–607, Bibcode :2006AstL...32..604R , doi :10.1134/S1063773706090052 , S2CID 121747360
^ Tanrıverdi, T.; Baştürk, Ö. (2016). "Abundance analysis of the supergiant stars HD 80057 and HD 80404 based on their UVES Spectra". New Astronomy . 47 : 46–56. arXiv :1512.03762 . Bibcode :2016NewA...47...46T . doi :10.1016/j.newast.2016.02.006 . S2CID 119220398 .
^ a b c d e f g h i Smiljanic, R.; et al. (April 2006), "CNO in evolved intermediate mass stars", Astronomy and Astrophysics , 449 (2 ): 655–671, arXiv :astro-ph/0511329 , Bibcode :2006A&A...449..655S , doi :10.1051/0004-6361:20054377 , S2CID 3711409
^ a b Kaler, James B., "ASPIDISKE (Iota Carinae)" , Stars , University of Illinois, retrieved 2012-01-14
^ 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
^ "iot Car -- Variable Star" , SIMBAD , Centre de Données astronomiques de Strasbourg , retrieved 2012-01-14
^ "IAU Catalog of Star Names" . Retrieved 28 July 2016 .
^ a b Allen, Richard Hinckley (1899), "Star-names and their meanings" , New York , G. E. Stechert: 74, Bibcode :1899sntm.book.....A
^ Moore, Patrick (2010). Patrick Moore's Astronomy: Teach Yourself . Hachette. ISBN 978-1444129779 .
^ In the Sky Map , Dominic Ford, 2011–2019.
^ "IAU Working Group on Star Names (WGSN)" . Retrieved 22 May 2016 .
^ "Bulletin of the IAU Working Group on Star Names, No. 1" (PDF) . Retrieved 28 July 2016 .
^ (in Chinese) 中國星座神話 , written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7 .
^ (in Chinese) 香港太空館 – 研究資源 – 亮星中英對照表 Archived 2010-08-11 at the Wayback Machine , Hong Kong Space Museum. Accessed on line November 23, 2010.
^ Neuhäuser, R; Torres, G; Mugrauer, M; Neuhäuser, D L; Chapman, J; Luge, D; Cosci, M (2022-07-29). "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 ): 693–719. arXiv :2207.04702 . doi :10.1093/mnras/stac1969 . ISSN 0035-8711 .
^ "The Colour of Stars" , Australia Telescope, Outreach and Education , Commonwealth Scientific and Industrial Research Organisation , December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16
^ "Precession" .
Stars
Outer space
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Iota_Carinae&oldid=1193734305 "
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