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C o o r d i n a t e s : 13 h 47 m 3 2 . 4 s , + 4 9 ° 1 8 ′ 4 7 . 8 ″
F r o m W i k i p e d i a , t h e f r e e e n c y c l o p e d i a
Star in the constellation Ursa Major
Alkaid
Location of Alkaid (circled)
Observation dataEpoch J2000 Equinox J2000
Constellation
Ursa Major
Right ascension 13 h 47 m s [1]
Declination
+49° 18 ′ 47.7602″[1]
Apparent magnitude (V )+1.86[2]
Characteristics
Spectral type
B3 V [3]
U−B color index
−0.68[2]
B−V color index
−0.19[2]
Astrometry Radial velocity (R v −10.9[4] Proper motion (μ) RA: −121.17[1] mas /yr Dec.: −14.91[1] mas /yr Parallax (π)31.38 ± 0.24 mas [1] Distance 103.9 ± 0.8 ly pc Absolute magnitude (M V −0.67[5] Details Mass ± 0.1[6] M ☉ Radius 3.4[7] R ☉ Luminosity ± 31 [8] L ☉ Surface gravity (log g 3.78[8] cgs Temperature ± 1,157[8] K Rotational velocity (v i 150[9] Age ± 2.6[6] Myr Other designations
Alkaid, Benetnash, Benetnasch,[10] η UMa, 85 BD FK5 509, GC HD HIP 67301, HR PPM 53742, SAO 44752.
Database references SIMBAD data
Alkaid , also called Eta Ursae Majoris (Latinised from η Ursae Majoris , abbreviated Eta UMa , η UMa ),[11] [12] star in the constellation of Ursa Major . It is the most eastern (leftmost) star in the Big Dipper (or Plough) asterism . However, unlike most stars of the Big Dipper, it is not a member of the Ursa Major moving group .[13] apparent visual magnitude of +1.86, it is the third-brightest star in the constellation and one of the brightest stars in the night sky .
Physical properties [ edit ]
Comparison of Eta Ursae Majoris and the Sun
Eta Ursae Majoris is a 10-million-year-old[6] B-type main sequence star with a stellar classification of B3 V.[3] spectrum of this star has served as one of the stable anchor points by which other stars are classified.[14] [6] [7] [8] Sun . Its outer atmosphere has an effective temperature of about 15,540 K,[8] B-type star .[15] X-ray emitter with a luminosity of 9.3 × 1028 −1 .[16]
Eta Ursae Majoris was listed as a standard star for the spectral type B3 V. It has broadened absorption lines due to its rapid rotation, which is common in stars of this type. However, the lines are very slightly distorted and variable, which may be caused by some emission from a weak disk of material produced by the rapid rotation.[17]
Eta Ursae Majoris is a relatively nearby and bright star and has been examined closely, but no exoplanets or companion stars have been discovered.[18] [19]
Nomenclature [ edit ]
η Ursae Majoris (Latinised to Eta Ursae Majoris ) is the star's Bayer designation . The International Astronomical Union has formally chosen the proper name Alkaid for this star.[20]
It bore the traditional names Alkaid (or Elkeid from the Arabic القايد القائد) and Benetnasch [11] Alkaid derives from the Arabic phrase meaning "The leader of the daughters of the bier " (قائد بنات نعش qā'id bināt naʿsh Mizar , and Alioth ; while the four stars of the bowl, Megrez , Phecda , Merak , and Dubhe , are the bier.
It is known as Běidǒuqī (北斗七 - the Seventh Star of the Northern Dipper) or Yáoguāng (瑤光 - the Star of Twinkling Brilliance) in Chinese.
The Hindus knew this star as Marīci Seven Rishis .[21]
In Japan and Korea , Alkaid is known as Hagunsei and Mukokseong respectively ("the military breaking star" or "most corner star"). Both meanings come from ancient China's influence in both countries.
In culture [ edit ]
USS Alkaid (AK-114) was a United States Navy Crater class cargo ship named after the star.[22]
Alkaid is one of the Behenian fixed stars , used in Alchemy .
References [ edit ]
^ a b c Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues . 2237 : 0. Bibcode :2002yCat.2237....0D .
^ a b Morgan, W. W.; Keenan, P. C. (1973). "Spectral Classification". Annual Review of Astronomy and Astrophysics . 11 Bibcode :1973ARA&A..11...29M . doi :10.1146/annurev.aa.11.090173.000333 .
^ 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 ): 1. Bibcode :1999VeARI..35....1W .
^ 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 d 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 .
^ a b Underhill, A. B.; et al. (November 1979). "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars" . Monthly Notices of the Royal Astronomical Society 189 (3 ): 601–605. Bibcode :1979MNRAS.189..601U . doi :10.1093/mnras/189.3.601
^ a b c d e Baines, E.; Schmitt, H. R.; Zavala, R. T.; Hutter, D.; van Belle, G. T. (2017). "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer" . The Astronomical Journal . 155 (1 ): 30. arXiv :1712.08109 Bibcode :2018AJ....155...30B . doi :10.3847/1538-3881/aa9d8b S2CID 119427037 .
^ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002). "Rotational Velocities of B Stars" . The Astrophysical Journal . 573 (1 ): 359–365. Bibcode :2002ApJ...573..359A . doi :10.1086/340590
^ Rumrill, H. B. (1936). "Star Name Pronunciation" . Publications of the Astronomical Society of the Pacific . 48 Bibcode :1936PASP...48..139R . doi :10.1086/124681 S2CID 120743052 .
^ a b Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7
^ "IAU Catalog of Star Names" . Retrieved 28 July 2016 .
^ Motz, Lloyd ; Nathanson, Carol (1988). The Constellations: An Enthusiast's Guide To The Night Sky 39 ISBN 978-0385176002
^ Garrison, R. F. (December 1993). "Anchor Points for the MK System of Spectral Classification" . Bulletin of the American Astronomical Society . 25 Bibcode :1993AAS...183.1710G . Archived from the original on 2019-06-25. Retrieved 2012-02-04 .
^ "The Colour of Stars" . Australia Telescope, Outreach and Education . Commonwealth Scientific and Industrial Research Organisation . December 21, 2004. Archived from the original on 2012-03-18. Retrieved 2012-01-16 .
^ Cassinelli, J. P.; et al. (February 1994). "X-ray emission from near-main-sequence B stars". Astrophysical Journal, Part 1 . 421 (2 ): 705–717. Bibcode :1994ApJ...421..705C . doi :10.1086/173683 .
^ Bopp, B. W; Caplinger, J. R; Crosby, N. A; Mahoney, D. F; O'Brien, S. P; Dempsey, R. C (1989). "Is the MK Standard eta UMa an Incipient be Star?". Information Bulletin on Variable Stars . 3347 : 1. Bibcode :1989IBVS.3347....1B .
^ Howard, Andrew W; Fulton, Benjamin J (2016). "Limits on Planetary Companions from Doppler Surveys of Nearby Stars". Publications of the Astronomical Society of the Pacific . 128 (969): 114401. arXiv :1606.03134 Bibcode :2016PASP..128k4401H . doi :10.1088/1538-3873/128/969/114401 . S2CID 118503912 .
^ Roberts, Lewis C; Turner, Nils H; Ten Brummelaar, Theo A (2007). "Adaptive Optics Photometry and Astrometry of Binary Stars. II. A Multiplicity Survey of B Stars" . The Astronomical Journal . 133 (2 ): 545. Bibcode :2007AJ....133..545R . CiteSeerX 10.1.1.549.4623 doi :10.1086/510335
^ "Naming Stars" . International Astronomical Union . Retrieved 18 July 2023 .
^ Allen, R. H. (1963). Star Names: Their Lore and Meaning 438 . ISBN 978-0-486-21079-7 . Retrieved 2012-09-04 .
^ "Alkaid (AK-114)" . Naval History and Heritage Command . 11 December 2016. Retrieved 31 December 2019 .
External links [ edit ]
Alkaid at Jim Kaler's Stars website
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R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Alkaid&oldid=1209950489 " C a t e g o r i e s : ● B a y e r o b j e c t s ● B i g D i p p e r ● B - t y p e m a i n - s e q u e n c e s t a r s ● U r s a M a j o r ● S t a r s w i t h p r o p e r n a m e s ● F l a m s t e e d o b j e c t s ● B r i g h t S t a r C a t a l o g u e o b j e c t s ● H e n r y D r a p e r C a t a l o g u e o b j e c t s ● H i p p a r c o s o b j e c t s ● D u r c h m u s t e r u n g o b j e c t s H i d d e n c a t e g o r i e s : ● A r t i c l e s w i t h s h o r t d e s c r i p t i o n ● S h o r t d e s c r i p t i o n m a t c h e s W i k i d a t a ● A r t i c l e s c o n t a i n i n g A r a b i c - l a n g u a g e t e x t
● T h i s p a g e w a s l a s t e d i t e d o n 2 4 F e b r u a r y 2 0 2 4 , a t 0 8 : 2 0 ( U T C ) . ● T e x t i s a v a i l a b l e u n d e r t h e C r e a t i v e C o m m o n s A t t r i b u t i o n - S h a r e A l i k e L i c e n s e 4 . 0 ;
a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n . ● P r i v a c y p o l i c y ● A b o u t W i k i p e d i a ● D i s c l a i m e r s ● C o n t a c t W i k i p e d i a ● C o d e o f C o n d u c t ● D e v e l o p e r s ● S t a t i s t i c s ● C o o k i e s t a t e m e n t ● M o b i l e v i e w
13h47m32.4s, +49° 18′ 47.8″
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