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Binary star system in the constellation Pisces
Eta Piscium
Location of η Piscium (circled)
Observation dataEpoch J2000.0 Equinox J2000.0 (ICRS )
Constellation
Pisces
Right ascension 01 h 31 m s [1]
Declination
+15° 20 ′ 44.9685″[1]
Apparent magnitude (V )+3.611[2] (3.83 + 7.51) [3]
Characteristics
Spectral type
G7 IIIa[4]
U−B color index
+0.730[2]
B−V color index
+0.976[2]
Variable type
γ Cas
Astrometry Radial velocity (R v ± 0.42[5] Proper motion (μ) RA: +27.14[1] mas /yr Dec.: −2.64[1] mas /yr Parallax (π)9.33 ± 0.72 mas [1] Distance 350 ± 30 ly pc Absolute magnitude (M V −1.52[6] Orbit [7] Period (P )± 66.5yr Semi-major axis (a )± 0.144Eccentricity (e )± 0.053Inclination (i )± 2.5Longitude of the node (Ω)± 2.0Periastron epoch (T )2 040 .3± 66.9Argument of periastron (ω)± 4.0Details[5] η Psc A Mass ± 0.16M ☉ Radius ± 2.15R ☉ Luminosity 457 L ☉ Surface gravity (log g ± 0.14cgs Temperature ± 40 K Metallicity ± 0.06dex Rotational velocity (v i 8.4[8] Age ± 30 Myr Other designations
Alpherg, η Psc , 99 Piscium , BD FK5 50, HD HIP 7097, HR SAO 92484, WDS J01315+1521AB[9]
Database references SIMBAD data
Eta Piscium (η Piscium , abbreviated Eta Psc , η Psc ) is a binary star and the brightest star in the constellation of Pisces , with an apparent visual magnitude of +3.6.[2] parallax shift of 9.33 mas as seen from Earth,[1] light-years distant from the Sun in the thin disk population of the Milky Way .[5]
The two components are designated Eta Piscium A (formally named Alpherg , the traditional name of the system)[10] B
Nomenclature [ edit ]
η Piscium (Latinised to Eta Piscium ) is the system's Bayer designation . The designations of the two constituents as Eta Piscium A and B multiple star systems , and adopted by the International Astronomical Union (IAU).[11]
The system bore the traditional names Al Pherg (in this context meaning the emptying) and Kullat Nunu . At the time that the sun at the March Equinox entered into Pisces having lay in Aries, the system was in the first ecliptic constellation of the Neo-Babylonians , Kullat Nūnu − 'Nūnu' being Babylonian for fish and 'Kullat' referring to either the bucket or the cord that binds the fish.[12] Working Group on Star Names (WGSN)[13] multiple systems .[14] Alpherg for the component Eta Piscium A on 1 June 2018 (for its official List).[10]
In Chinese , 右更 Yòu Gèng Official in Charge of the Pasturing asterism consisting of Eta Piscium, Rho Piscium , Pi Piscium , Omicron Piscium and 104 Piscium . Consequently, the Chinese name for Eta Piscium itself is 右更二 Yòu Gèng èr the Second Star of Official in Charge of the Pasturing .)[15]
Properties [ edit ]
At its present distance, the visual magnitude of the system is diminished by an extinction factor of ± 0.06interstellar dust .
This system's binary nature was discovered in 1878 by an amateur astronomer, S. W. Burnham .[7] orbital period of roughly 850 years, a semimajor axis of 1.2 arc seconds , and an eccentricity of 0.47.
The primary, component A, is an evolved , magnitude 3.83[3] G-type giant star with a stellar classification of G7 IIIa.[4] magnetic field with a strength of ± 0.2 G [8] Gamma Cassiopeiae variable .[7] [3]
References [ edit ]
^ a b c d Oja, T. (March 1985), "UBV photometry of stars whose positions are accurately known. II", Astronomy and Astrophysics Supplement Series , 59 Bibcode :1985A&AS...59..461O .
^ a b c 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 .
^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series , 71 Bibcode :1989ApJS...71..245K , doi :10.1086/191373 .
^ a b c Maldonado, J.; et al. (June 2013), "The metallicity signature of evolved stars with planets", Astronomy & Astrophysics , 554 : 18, arXiv :1303.3418 Bibcode :2013A&A...554A..84M , doi :10.1051/0004-6361/201321082 , S2CID 119289111 , A84.
^ 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 Cvetković, Z.; Novaković, B. (March 2010), "Eight new and three recalculated orbits for binaries", Astronomische Nachrichten , 331 (3 ): 304, Bibcode :2010AN....331..304C , doi :10.1002/asna.200911250 .
^ a b Aurière, M.; Konstantinova-Antova, R.; Charbonnel, C.; Wade, G. A.; Tsvetkova, S.; Petit, P.; Dintrans, B.; Drake, N. A.; Decressin, T.; Lagarde, N.; Donati, J. F.; Roudier, T.; Lignières, F.; Schröder, K. P.; Landstreet, J. D.; Lèbre, A.; Weiss, W. W.; Zahn, J. P. (February 2015), "The magnetic fields at the surface of active single G-K giants", Astronomy & Astrophysics , 574 : 30, arXiv :1411.6230 Bibcode :2015A&A...574A..90A , doi :10.1051/0004-6361/201424579 , S2CID 118504829 , A90.
^ "eta Psc" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2017-07-30 .
^ a b "Naming Stars" . IAU.org. Retrieved 18 June 2018 .
^ 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 ].
^ Allen, Richard Hinckley (1963) [1899], Star Names: Their Lore and Meaning rep . ed.), New York , NY Dover Publications Inc., pp. 328–29 , ISBN 0-486-21079-0
^ "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) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年5 月19 日 Archived 2016-03-03 at the Wayback Machine
External links [ edit ]
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Eta_Piscium&oldid=1214105059 " C a t e g o r i e s : ● G - t y p e g i a n t s ● G a m m a C a s s i o p e i a e v a r i a b l e s t a r s ● B i n a r y s t a r s ● B a y e r o b j e c t s ● P i s c e s ( c o n s t e l l a t i o n ) ● S t a r s w i t h p r o p e r n a m e s ● D u r c h m u s t e r u n g 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 ● H i p p a r c o s 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 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 1 7 M a r c h 2 0 2 4 , a t 0 0 : 0 4 ( 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
