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Star in the constellation Draco
η Draconis
Location of η Draconis (circled)
Observation dataEpoch J2000.0 Equinox J2000.0
Constellation
Draco
Right ascension 16 h 23 m s [1]
Declination
+61° 30 ′ 51.1699″[1]
Apparent magnitude (V )+2.73[2]
Characteristics
Spectral type
G8 III[2]
U−B color index
+0.70[3]
B−V color index
+0.91[3]
Astrometry Radial velocity (R v –14.3[4] Proper motion (μ) RA: –17.02[1] mas /yr Dec.: +56.95[1] mas /yr Parallax (π)35.42 ± 0.09 mas [1] Distance 92.1 ± 0.2 ly pc Absolute magnitude (M V +0.58[5] Details Mass 2.88[6] M ☉ Radius 10.46[6] R ☉ Luminosity 60 [2] L ☉ Surface gravity (log g 2.9[6] cgs Temperature 5,018[6] K Metallicity –0.088[6] dex Rotational velocity (v i 8 [7] Age 550[2] Myr Other designations
Aldibain, Athebyne, 14 Draconis, BD FK5 822, HD HIP 80331, HR NSV 7713, SAO 17074, WDS 16240+6131.[8]
Database references SIMBAD data
Eta Draconis (η Draconis , abbreviated Eta Dra , η Dra ) is a binary star in the northern circumpolar constellation of Draco . Despite having an apparent visual magnitude of only +2.73,[2] second-brightest star in this generally faint constellation. Based upon parallax measurements collected during the Hipparcos mission, this star is located at a distance of about 92.1 light-years (28.2 parsecs ) from the Sun .[1]
The two components are designated Eta Draconis A (also named Athebyne [9] B
Nomenclature [ edit ]
η Draconis (Latinised to Eta Draconis ) is the system's Bayer designation . The designations of the two components as Eta Draconis A and B multiple star systems , and adopted by the International Astronomical Union (IAU).[10]
Eta Draconis, together with Zeta Draconis , bore the traditional Arabic name الذئبين al-dhiʼbayn , "the (two) wolves", lying in wait for the camel's foal, the little star Al Rubaʽ , protected by the Mother Camels .[11]
In 2016, the IAU organized a Working Group on Star Names (WGSN)[12] multiple systems .[13] Athebyne (a rendering of adh-dhiʼbayn ) for the component Eta Draconis A on 5 September 2017. It approved the name Aldhibah (the female wolf) for Zeta Draconis A on the same date. Both are now so included in the List of IAU-approved Star Names.[9]
In Chinese , 紫微左垣 Zǐ Wēi Zuǒ Yuán Left Wall of Purple Forbidden Enclosure asterism consisting of Eta Draconis, Iota Draconis , Theta Draconis , Zeta Draconis, Upsilon Draconis , 73 Draconis , Gamma Cephei and 23 Cassiopeiae .[14] Chinese name for Eta Draconis itself is 紫微左垣三 Zǐ Wēi Zuǒ Yuán sān the Third Star of Left Wall of Purple Forbidden Enclosure ),[15] 少宰 Shàozǎi The Second Premier .[16] Hea Tsae by R.H. Allen with meaning "the Lowest Steward" but it was for Theta Draconis.[17]
Properties [ edit ]
Eta Draconis A is a star with 2.88[6] mass of the Sun . The spectrum matches a stellar classification of G8 III,[2] luminosity class III indicating this is an evolved giant star that has exhausted the supply of hydrogen at its core. It reached this stage in only 550[2] angular diameter of this star, after correction for limb darkening , is mas [6] [1] radius of the Sun .[6] envelope , it is radiating around 60[2] luminosity of the Sun at an effective temperature of 5,018 K,[6] [18]
Eta Draconis B is located at an angular separation of 5.1 arcseconds from the primary. This is an 8.8 magnitude K-type main sequence star with a stellar classification of K2 V.[19] AU orbit .[20]
References [ edit ]
^ a b Nicolet, B. (1978). "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System". Astronomy and Astrophysics Supplement Series . 34 Bibcode :1978A&AS...34....1N .
^ Wilson, Ralph Elmer (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication . Washington: Carnegie Institution of Washington . Bibcode :1953GCRV..C......0W .
^ Pizzolato, N.; Maggio, A.; Sciortino, S. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", Astronomy and Astrophysics , 361 : 614–628, Bibcode :2000A&A...361..614P
^ a b c d e f g h i Gray, David F.; Kaur, Taranpreet (2019-09-01). "A Recipe for Finding Stellar Radii, Temperatures, Surface Gravities, Metallicities, and Masses Using Spectral Lines" . The Astrophysical Journal . 882 (2 ): 148. Bibcode :2019ApJ...882..148G . doi :10.3847/1538-4357/ab2fce ISSN 0004-637X .
^ Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago . 239 (1 ): 1. Bibcode :1970CoAsi.239....1B .
^ "eta Dra" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2012-02-20 .
^ a b "Naming Stars" . IAU.org. Retrieved 16 December 2017 .
^ Hessman, F. V.; Dhillon, V. S.; Winget, D. E.; Schreiber, M. R.; Horne, K.; Marsh, T. R.; Guenther, E.; Schwope, A.; Heber, U. (2010). "On the naming convention used for multiple star systems and extrasolar planets". arXiv :1012.0707 astro-ph.SR ].
^ Star Name - R.H Allen p. 202
^ "IAU Working Group on Star Names (WGSN)" . Retrieved 22 May 2016 .
^ "WG Triennial Report (2015-2018) - Star Names" (PDF) . p. 5 . Retrieved 2018-07-14 .
^ (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) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年6 月10 日 Archived 2011-05-21 at the Wayback Machine
^ (in Chinese) English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name Archived August 10, 2010, at the Wayback Machine , Hong Kong Space Museum. Accessed on line November 23, 2010.
^ Star Name - R.H. Allen p. 210
^ "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
^ Eggleton, P. P.; Tokovinin, A. A. (September 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 .
^ Kaler, James B., "AL DHIBAIN "PRIOR" (Eta Draconis)" , Stars , University of Illinois , retrieved 2012-02-20
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Eta_Draconis&oldid=1227155009 " C a t e g o r i e s : ● D r a c o ( c o n s t e l l a t i o n ) ● B a y e r o b j e c t s ● G - t y p e g i a n t s ● H i p p a r c o s o b j e c t s ● F l a m s t e e d 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 ● 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 ● D u r c h m u s t e r u n g o b j e c t s ● B i n a r y s t a r 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 C h i n e s e - l a n g u a g e s o u r c e s ( zh ) ● W e b a r c h i v e t e m p l a t e w a y b a c k l i n k 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 C h i n e s e - l a n g u a g e t e x t ● A r t i c l e s c o n t a i n i n g e x p l i c i t l y c i t e d E n g l i s h - 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 4 J u n e 2 0 2 4 , a t 0 1 : 3 3 ( 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
